Salar Cafe
Statistical Calculator Hub
Choose a calculator by method. Each card links to one exact calculator with its own inputs, formula, outputs, examples, and result panel.
Descriptive Statistics
- Mean Calculator Calculate the arithmetic mean from raw numeric data. Inputs: Raw numeric data Open Calculator
- Standard Deviation Calculator Calculate sample or population standard deviation from raw data. Inputs: Raw numeric data, Variance type Open Calculator
- Median Calculator Find the middle value from sorted numeric data. Inputs: Raw numeric data Open Calculator
- Mode Calculator Find the most frequent value or values. Inputs: Raw numeric data Open Calculator
- Range Calculator Calculate maximum minus minimum. Inputs: Raw numeric data Open Calculator
- Variance Calculator Calculate sample or population variance. Inputs: Raw numeric data, Variance type Open Calculator
- Standard Error Calculator Calculate standard error from sample data. Inputs: Raw numeric data Open Calculator
- Coefficient of Variation Calculator Calculate relative dispersion as SD divided by mean. Inputs: Raw numeric data Open Calculator
- Quartiles Calculator Calculate Q1, Q2, and Q3. Inputs: Raw numeric data Open Calculator
- Interquartile Range Calculator Calculate Q3 minus Q1. Inputs: Raw numeric data Open Calculator
- Five-Number Summary Calculator Calculate min, Q1, median, Q3, and max. Inputs: Raw numeric data Open Calculator
- Skewness Calculator Calculate distribution asymmetry. Inputs: Raw numeric data Open Calculator
- Kurtosis Calculator Calculate excess kurtosis. Inputs: Raw numeric data Open Calculator
- Percentile Rank Calculator Calculate percentile rank for a value. Inputs: Raw numeric data, Value to rank Open Calculator
- Mean Median and Mode Calculator Calculate mean, median, mode, frequency counts, sorted data, min, max, and range from one raw numeric data vector. Inputs: Raw numeric data Open Calculator
Probability and Distributions
- Normal Distribution Probability Calculator Calculate normal probabilities from mean, SD, and x. Inputs: Mean, Standard deviation, X value, Second X value for between, Probability type Open Calculator
- Standard Normal Z Probability Calculator Calculate standard normal probabilities. Inputs: Z value, Probability type Open Calculator
- Binomial Probability Calculator Calculate binomial probability for n, p, and x. Inputs: Number of trials (n), Success probability (p), Success count (x), Probability type Open Calculator
- Poisson Probability Calculator Calculate Poisson probability for lambda and x. Inputs: Lambda, Event count (x), Probability type Open Calculator
- T Distribution Calculator Calculate Student t probabilities. Inputs: T value, Degrees of freedom, Probability type Open Calculator
- Chi-Square Distribution Calculator Calculate chi-square probabilities. Inputs: Chi-square value, Degrees of freedom, Probability type Open Calculator
- F Distribution Calculator Calculate F distribution probabilities. Inputs: F value, Numerator df, Denominator df, Probability type Open Calculator
Z Tests
- Z Score Calculator Calculate a standardized z score from x, mean, and standard deviation. Inputs: X value, Mean, Standard deviation Open Calculator
- One Sample Z Test Calculator Test a sample mean against a null mean when the population standard deviation is known. Inputs: Sample mean, Null mean, Known population standard deviation, Sample size, Alpha, Alternative hypothesis Open Calculator
- Two Sample Z Test Calculator Compare two means with known population standard deviations. Inputs: Sample mean A, Sample mean B, Known population SD A, Known population SD B, Sample size A, Sample size B, Alpha, Alternative hypothesis Open Calculator
- One Proportion Z Test Calculator Test a single population proportion. Inputs: Successes, Sample size, Null proportion, Alpha, Alternative hypothesis Open Calculator
- Two Proportion Z Test Calculator Compare two population proportions. Inputs: Successes A, Sample size A, Successes B, Sample size B, Alpha, Alternative hypothesis Open Calculator
- Confidence Interval for Mean with Known Sigma Estimate a population mean when sigma is known. Inputs: Sample mean, Known population SD, Sample size, Alpha Open Calculator
- Confidence Interval for Population Proportion Estimate a population proportion. Inputs: Successes, Sample size, Alpha Open Calculator
T Tests
- One Sample T Test Calculator Test whether a sample mean differs from a hypothesized mean using sample data and Student t distribution. Inputs: Raw sample data, Null mean, Alpha, Alternative hypothesis Open Calculator
- Independent Samples T Test Calculator Compare two independent group means using the equal-variance pooled t test. Inputs: Group A data, Group B data, Alpha, Alternative hypothesis Open Calculator
- Paired Samples T Test Calculator Compare paired observations by testing the mean of within-pair differences. Inputs: Before data, After data, Alpha, Alternative hypothesis Open Calculator
- Welch Independent Samples T Test Calculator Compare two means without assuming equal variances. Inputs: Group A data, Group B data, Alpha, Alternative hypothesis Open Calculator
- Confidence Interval for Mean with Unknown Sigma Estimate a population mean using t distribution. Inputs: Raw numeric data, Alpha Open Calculator
ANOVA Family
- One-Way ANOVA Calculator Compare three or more independent group means using one-way ANOVA. Inputs: Groups, Alpha Open Calculator
- Two-Way ANOVA Without Replication Calculator Analyze two factors without replicated cells. Inputs: Data matrix, Alpha Open Calculator
- Two-Way ANOVA With Replication Calculator Analyze two factors with replication. Inputs: Cells as A,B:value list, Alpha Open Calculator
- Repeated Measures ANOVA Calculator Analyze within-subject repeated measurements. Inputs: Data matrix, Alpha Open Calculator
- Welch ANOVA Calculator Compare group means with unequal variances. Inputs: Groups, Alpha Open Calculator
- Brown-Forsythe ANOVA Calculator Test equality of group means under unequal variances using the Brown-Forsythe F-star method. Inputs: Groups, Alpha Open Calculator
Post Hoc Tests
- Tukey HSD Calculator Run Tukey pairwise comparisons after ANOVA. Inputs: Groups, Alpha Open Calculator
- Tukey-Kramer Calculator Run Tukey-Kramer comparisons for unequal sample sizes. Inputs: Groups, Alpha Open Calculator
- Bonferroni Pairwise Comparisons Calculator Run pairwise tests with Bonferroni adjustment. Inputs: Groups, Alpha Open Calculator
- Scheffe Test Calculator Run Scheffe post hoc comparisons. Inputs: Groups, Alpha Open Calculator
- Games-Howell Calculator Run unequal variance post hoc comparisons. Inputs: Groups, Alpha Open Calculator
- Tamhane T2 Calculator Run unequal variance Tamhane T2 comparisons. Inputs: Groups, Alpha Open Calculator
- Dunnett Test Calculator Compare treatments against a control. Inputs: Groups, Control group name, Alpha Open Calculator
- Fisher LSD Calculator Run Fisher least significant difference comparisons. Inputs: Groups, Alpha Open Calculator
- Student-Newman-Keuls Calculator Run SNK post hoc comparisons. Inputs: Groups, Alpha Open Calculator
- Ryan-Einot-Gabriel-Welsch Calculator Run REGW post hoc comparisons. Inputs: Groups, Alpha Open Calculator
- Waller-Duncan Calculator Run Waller-Duncan post hoc comparisons. Inputs: Groups, Type I / Type II loss ratio (K), Alpha Open Calculator
Correlation Tests
- Pearson Correlation Calculator Calculate Pearson r for two continuous variables. Inputs: X values, Y values, Alpha Open Calculator
- Spearman Rank Correlation Calculator Calculate correlation after ranking both variables. Inputs: X values, Y values, Alpha Open Calculator
- Kendall Tau Correlation Calculator Calculate concordance-based Kendall tau. Inputs: X values, Y values, Alpha Open Calculator
- Point-Biserial Correlation Calculator Correlate one binary and one continuous variable. Inputs: Binary variable (0/1), Continuous variable, Alpha Open Calculator
- Phi Coefficient Calculator Measure association for a 2x2 table. Inputs: 2x2 table, Alpha Open Calculator
- Partial Correlation Calculator Calculate correlation controlling for covariates. Inputs: X values, Y values, Control variable Z, Alpha Open Calculator
- Autocorrelation Calculator Calculate lagged correlation in ordered data. Inputs: Raw numeric data, Lag Open Calculator
Regression Tests
- Simple Linear Regression Calculator Fit a straight-line regression equation for one predictor and one outcome. Inputs: X predictor values, Y outcome values, Alpha Open Calculator
- Multiple Linear Regression Calculator Fit a model with multiple predictors. Inputs: Y outcome values, Predictor matrix, one row per observation, Alpha Open Calculator
- Logistic Regression Calculator Fit a binary outcome logit model. Inputs: Binary outcome (0/1), Predictor values, Alpha Open Calculator
- Polynomial Regression Calculator Fit a polynomial regression model. Inputs: X values, Y values, Polynomial degree, Alpha Open Calculator
- Residual Calculator Calculate observed minus predicted residuals. Inputs: Observed values, Predicted values Open Calculator
- R-Squared Calculator Calculate coefficient of determination. Inputs: Observed values, Predicted values, Predictor count Open Calculator
- Adjusted R-Squared Calculator Calculate adjusted R-squared. Inputs: Observed values, Predicted values, Predictor count Open Calculator
Chi-Square Tests
- Chi-Square Test of Independence Calculator Test whether two categorical variables are independent using a contingency table. Inputs: Observed contingency table, Alpha Open Calculator
- Chi-Square Goodness of Fit Calculator Compare observed and expected frequencies. Inputs: Observed frequencies, Expected frequencies, Alpha Open Calculator
- Chi-Square Test of Homogeneity Calculator Compare distributions across populations. Inputs: Contingency table, Alpha Open Calculator
- Fisher Exact Test Calculator Calculate exact probability for a 2x2 table. Inputs: Contingency table, Alpha Open Calculator
- Cramer V Calculator Calculate Cramer V effect size. Inputs: Contingency table, Alpha Open Calculator
Nonparametric Tests
- Mann-Whitney U Test Calculator Compare two independent groups using ranks. Inputs: Groups, Alpha Open Calculator
- Wilcoxon Signed-Rank Test Calculator Analyze paired signed ranks. Inputs: Before data, After data, Alpha Open Calculator
- Kruskal-Wallis Test Calculator Compare three or more groups using ranks. Inputs: Groups, Alpha Open Calculator
- Friedman Test Calculator Analyze repeated/block ranked data. Inputs: Groups, Alpha Open Calculator
- Sign Test Calculator Test paired signs. Inputs: Before data, After data, Alpha Open Calculator
- Runs Test Calculator Test sequence randomness. Inputs: Binary or sign sequence, Alpha Open Calculator
- Kolmogorov-Smirnov Test Calculator Compare empirical distributions. Inputs: Sample A, Sample B, Alpha Open Calculator
Normality and Assumption Tests
- Shapiro-Wilk Test Calculator Test normality using Shapiro-Wilk. Inputs: Raw numeric data, Alpha Open Calculator
- Kolmogorov-Smirnov Normality Test Calculator Test normality using KS method. Inputs: Raw numeric data, Alpha Open Calculator
- Anderson-Darling Test Calculator Test goodness of fit with tail sensitivity. Inputs: Raw numeric data, Alpha Open Calculator
- D Agostino-Pearson Test Calculator Test normality from skewness and kurtosis. Inputs: Raw numeric data, Alpha Open Calculator
- Jarque-Bera Test Calculator Test normality from skewness and kurtosis. Inputs: Raw numeric data, Alpha Open Calculator
- Levene Test Calculator Test equality of variances. Inputs: Groups, Alpha Open Calculator
- Brown-Forsythe Test Calculator Robust equality-of-variances test. Inputs: Groups, Alpha Open Calculator
- Bartlett Test Calculator Test equal variances under normality. Inputs: Groups, Alpha Open Calculator
- Mauchly Sphericity Test Calculator Test sphericity in repeated measures. Inputs: Data matrix, Alpha Open Calculator
Reliability Tests
- Cronbach Alpha Calculator Calculate internal consistency from item scores. Inputs: Item-score matrix Open Calculator
- KR-20 Calculator Calculate reliability for dichotomous items. Inputs: Dichotomous item matrix (0/1) Open Calculator
- Split-Half Reliability Calculator Calculate split-half reliability. Inputs: Item-score matrix, Split point after item number Open Calculator
- Item-Total Correlation Calculator Calculate item-total correlations. Inputs: Item-score matrix Open Calculator
- Composite Reliability Calculator Calculate latent construct reliability. Inputs: Standardized factor loadings, Error variances (optional) Open Calculator
Sample Size and Power Calculators
- Sample Size for Mean Calculator Estimate sample size for a mean. Inputs: Margin of error, Population standard deviation, Alpha Open Calculator
- Sample Size for Proportion Calculator Estimate sample size for a proportion. Inputs: Margin of error as decimal, Planning proportion, Alpha Open Calculator
- Sample Size for Two Means Calculator Estimate sample size for comparing means. Inputs: Mean difference to detect, Common standard deviation, Target power, Alpha Open Calculator
- Sample Size for Two Proportions Calculator Estimate sample size for comparing proportions. Inputs: Proportion A, Proportion B, Target power, Alpha Open Calculator
- Margin of Error Calculator Calculate margin of error. Inputs: Sample size, Planning proportion, Alpha Open Calculator
- Power Calculator for T Test Estimate power for a t test. Inputs: Cohen d effect size, Sample size per group, Alpha, Alternative hypothesis Open Calculator
- Power Calculator for ANOVA Estimate power for ANOVA. Inputs: Cohen f effect size, Groups count, Sample size per group, Alpha Open Calculator
General Math Calculators
- Statistics Calculator Calculate count, sum, mean, median, min, max, range, variance, standard deviation, and geometric mean. Inputs: Values Open Calculator
- Confidence Interval Calculator Calculate a confidence interval for a mean from mean, standard deviation, sample size, and confidence level. Inputs: Sample mean, Sample standard deviation, Sample size, Confidence level percent Open Calculator
- P-value Calculator Calculate one-tailed or two-tailed p-values for z, t, chi-square, and F statistics. Inputs: Distribution, Test statistic, Degrees of freedom 1, Degrees of freedom 2, Tail type Open Calculator
- Probability Calculator Calculate complement, union, intersection, conditional, and independent-event probabilities. Inputs: P(A), P(B), P(A and B), Probability to calculate Open Calculator
- Permutation and Combination Calculator Calculate nPr and nCr for a selected n and r. Inputs: n, r Open Calculator
- Percent Calculator Calculate percentages, percent change, and what percent one number is of another. Inputs: Value, Base, Mode Open Calculator
- Slope Calculator Calculate slope from two points. Inputs: x1, y1, x2, y2 Open Calculator
- Quadratic Formula Calculator Solve ax^2 + bx + c = 0. Inputs: a, b, c Open Calculator
- Scientific Notation Calculator Convert a number to scientific notation. Inputs: Value Open Calculator
- Log Calculator Calculate a logarithm for any positive base except 1. Inputs: Value, Base Open Calculator
- Exponent Calculator Calculate base raised to an exponent. Inputs: Base, Exponent Open Calculator
- Root Calculator Calculate the nth root of a number. Inputs: Value, Root Open Calculator
- Basic Calculator Perform one selected arithmetic operation on two numbers, including remainder and exponentiation. Inputs: First number, Operation, Second number Open Calculator
- Big Number Calculator Calculate exactly with integers larger than JavaScript's ordinary safe-number range. Inputs: First integer, Operation, Second integer Open Calculator
- Common Factor Calculator List every positive factor shared by two or more whole numbers. Inputs: Whole numbers Open Calculator
- Distance Calculator Calculate 2D coordinate distance, 3D coordinate distance, or great-circle distance between latitude-longitude points. Inputs: Distance type, Point 1: x or latitude, Point 1: y or longitude, Point 1: z, Point 2: x or latitude, Point 2: y or longitude, Point 2: z, Earth distance unit Open Calculator
- Factor Calculator Find all positive factors and factor pairs of a nonzero whole number. Inputs: Whole number Open Calculator
- Fraction Calculator Add, subtract, multiply, or divide two fractions and simplify the exact result. Inputs: First numerator, First denominator, Operation, Second numerator, Second denominator Open Calculator
- Greatest Common Factor Calculator Calculate the greatest common factor of two or more whole numbers and show the reduction steps. Inputs: Whole numbers Open Calculator
- GDP Calculator Calculate expenditure-based gross domestic product, net exports, GDP per capita, and growth from a prior GDP value. Inputs: Private consumption (C), Gross private investment (I), Government spending (G), Exports (X), Imports (M), Population, Previous-period GDP Open Calculator
- Least Common Multiple Calculator Calculate the least common multiple of two or more nonzero whole numbers. Inputs: Whole numbers Open Calculator
- Long Division Calculator Divide two whole numbers and show quotient, remainder, decimal value, and digit-by-digit long-division steps. Inputs: Dividend, Divisor Open Calculator
- Matrix Calculator Add, subtract, multiply, transpose, invert, or find the determinant of numeric matrices. Inputs: Matrix A, Operation, Matrix B (for binary operations) Open Calculator
- Mileage Calculator Calculate fuel economy, trip fuel cost, and cost per distance in metric and US customary units. Inputs: Trip distance, Distance unit, Fuel used, Fuel unit, Fuel price per entered fuel unit Open Calculator
- Number Sequence Calculator Analyze a numeric sequence, identify common patterns, and project the next terms. Inputs: Sequence values, Number of next terms Open Calculator
- Percent Error Calculator Calculate signed error, absolute error, relative error, and percent error against an accepted value. Inputs: Experimental or observed value, Accepted or theoretical value Open Calculator
- Percent Off Calculator Calculate discount savings, sale price, optional sales tax, and quantity total. Inputs: Original unit price, Discount (%), Sales tax after discount (%), Quantity Open Calculator
- Prime Factorization Calculator Decompose a positive whole number into prime powers and derive divisor properties. Inputs: Positive whole number Open Calculator
- Ratio Calculator Simplify a two-part ratio and calculate its decimal, percentage, and equivalent scaled ratio. Inputs: First ratio value, Second ratio value, Equivalent ratio first value Open Calculator
- Rounding Calculator Round a number to a selected decimal place using nearest, ceiling, floor, or toward-zero rules. Inputs: Number to round, Decimal places (negative rounds left of the decimal), Rounding mode Open Calculator
- Scientific Calculator Evaluate a mathematical expression with parentheses, powers, constants, logarithms, roots, and trigonometric functions. Inputs: Expression, Angle mode Open Calculator
Finance Calculators
- Discount Calculator Calculate sale price and savings from original price and discount percent. Inputs: Original price, Discount percent Open Calculator
- Sales Tax Calculator Calculate tax amount and total price from subtotal and tax rate. Inputs: Subtotal, Tax rate percent Open Calculator
- Commission Calculator Calculate commission amount and total pay. Inputs: Sales amount, Commission rate percent, Base pay Open Calculator
- Margin Calculator Calculate gross profit, margin, and markup from cost and revenue. Inputs: Cost, Revenue Open Calculator
- Simple Interest Calculator Calculate simple interest and final value. Inputs: Principal, Annual interest rate percent, Years Open Calculator
- Compound Interest Calculator Calculate compound future value and earned interest. Inputs: Principal, Annual interest rate percent, Years, Compounds per year, Monthly contribution Open Calculator
- Loan Calculator Calculate loan payment, total payment, and total interest. Inputs: Loan amount, Annual interest rate percent, Years Open Calculator
- Mortgage Calculator Calculate mortgage payment, loan amount after down payment, total paid, and total interest. Inputs: Home price, Down payment, Annual interest rate percent, Years Open Calculator
- Future Value Calculator Calculate future value from present value, rate, and years. Inputs: Present value, Annual rate percent, Years, Compounds per year Open Calculator
- Present Value Calculator Calculate present value from future value, rate, and years. Inputs: Future value, Annual rate percent, Years, Compounds per year Open Calculator
- Annuity Calculator Calculate future value of a regular payment annuity. Inputs: Payment per period, Annual rate percent, Years, Payments per year Open Calculator
- Return on Investment ROI Calculator Calculate ROI from beginning value, ending value, and costs. Inputs: Beginning value, Ending value, Additional costs Open Calculator
- Tip Calculator Calculate tip amount, total bill, and per-person split. Inputs: Bill amount, Tip percent, People Open Calculator
- Fuel Cost Calculator Calculate trip fuel needed and cost. Inputs: Distance, Fuel efficiency, Fuel price per unit Open Calculator
- Gas Mileage Calculator Calculate fuel economy from distance and fuel used. Inputs: Distance, Fuel used Open Calculator
- Amortization Calculator Build a loan amortization schedule and measure the effect of optional extra monthly payments. Inputs: Loan principal, Annual interest rate (%), Loan term (years), Extra monthly payment Open Calculator
- Annuity Payout Calculator Calculate a level end-of-period annuity payout, total distributions, and interest from principal, rate, term, and payment frequency. Inputs: Annuity principal, Annual rate (%), Payout term (years), Payments per year Open Calculator
- APR Calculator Solve the monthly rate, nominal APR, and effective annual rate from net loan proceeds, finance charges, equal payments, and term. Inputs: Loan amount, Prepaid finance charges, Monthly payment, Term (months) Open Calculator
- Auto Lease Calculator Calculate automotive lease depreciation, money-factor finance charge, tax, monthly payment, residual, and total outlay. Inputs: Vehicle MSRP, Negotiated price, Cash cap-cost reduction, Trade-in credit, Residual (% of MSRP), Lease term (months), Money factor, Sales tax (%), Acquisition fee, Disposition fee Open Calculator
- Auto Loan Calculator Calculate taxable vehicle price, sales tax, amount financed, monthly payment, total interest, and combined cash outlay. Inputs: Vehicle price, Down payment, Trade-in value, Sales tax (%), Title, registration, and other fees, APR (%), Term (months) Open Calculator
- Average Return Calculator Calculate arithmetic mean, geometric mean, cumulative return, ending value, and sample volatility from period returns. Inputs: Period returns (%) Open Calculator
- Boat Loan Calculator Calculate boat financing with percentage down payment, trade, taxes/fees, and an optional end balloon. Inputs: Boat price, Down payment (%), Trade-in value, Taxes and fees, APR (%), Term (years), Balloon (% of financed amount) Open Calculator
- Bond Calculator Calculate coupon payment, current yield, nominal/effective yield to maturity, discount or premium, and duration for a fixed-rate bond. Inputs: Face value, Annual coupon rate (%), Market price, Years to maturity, Coupon payments per year Open Calculator
- Budget Calculator Classify monthly expenses as needs, wants, savings, or debt and calculate allocation ratios, surplus, and savings-target gap. Inputs: Monthly net income, Items: label, amount, need/want/saving/debt, Target savings (%) Open Calculator
- Business Loan Calculator Calculate business-loan payment, net proceeds after fees, contract interest, all-in cost, annual debt service, and fee-adjusted APR. Inputs: Loan principal, Annual rate (%), Term (years), Origination fee (%), Fixed fee Open Calculator
- Canadian Mortgage Calculator Convert a Canadian nominal semiannual mortgage rate to payment-period rate and calculate payment, term balance, principal, and interest. Inputs: Mortgage principal, Nominal annual rate (%), Amortization (years), Current term (years), Payment frequency, Extra per payment Open Calculator
- Cash Back or Low Interest Calculator Compare a cash-rebate loan at standard APR with a no-rebate promotional low-rate loan using the same price, down payment, and term. Inputs: Purchase price, Down payment, Cash rebate, APR with rebate (%), Promotional low APR (%), Term (months) Open Calculator
- CD Calculator Calculate certificate-of-deposit maturity, gross interest, effective yield, estimated interest tax, and after-tax maturity. Inputs: Deposit principal, Nominal annual rate (%), Term (months), Compounds per year, Tax rate on interest (%) Open Calculator
- College Cost Calculator Project inflation-adjusted college costs, future savings, and the remaining funding gap. Inputs: Current annual college cost, Years until college starts, Years in college, Annual education inflation (%), Current college savings, Expected annual savings return (%), Monthly contribution Open Calculator
- Credit Card Calculator Project a revolving credit-card balance under a percentage/floor minimum-payment rule and optional recurring purchases. Inputs: Current balance, APR (%), New charges each month, Minimum payment (% of statement), Minimum payment floor Open Calculator
- Credit Card Payoff Calculator Solve either the fixed payment required for a target payoff term or payoff months from a chosen payment, then simulate exact interest. Inputs: Solve for, Current balance, APR (%), Monthly payment, Target payoff months Open Calculator
- Currency Calculator Convert an amount with an explicit exchange rate and optional conversion fee, without using a hidden or stale rate. Inputs: Amount to convert, From currency code, To currency code, Exchange rate (to currency per 1 from currency), Conversion fee (%) Open Calculator
- Debt Consolidation Calculator Compare fixed-payment payoff of multiple current debts with a fee-inclusive consolidation loan's payment, term, and total cost. Inputs: Debts: balance, APR %, fixed payment, Consolidation APR (%), Consolidation term (months), Consolidation fee (%) Open Calculator
- Debt Payoff Calculator Simulate debt avalanche or snowball while rolling a fixed total monthly budget to remaining balances and reporting payoff order and interest. Inputs: Debts: name, balance, APR %, minimum, Extra monthly payment, Payoff strategy Open Calculator
- Debt Ratio Calculator Calculate housing-only front-end and total back-end debt-to-income ratios against editable lender limits. Inputs: Monthly gross income, Monthly housing payment, Installment debt payments, Revolving minimum payments, Other required debt payments, Front-end limit (%), Back-end limit (%) Open Calculator
- Depreciation Calculator Create annual depreciation schedules using straight-line, declining-balance, or sum-of-years-digits methods. Inputs: Depreciation method, Asset cost, Salvage value, Useful life (years), Declining-balance factor Open Calculator
- Down Payment Calculator Allocate available cash among closing costs, emergency reserve, and down payment and compare with an entered minimum. Inputs: Home price, Cash available, Closing costs (% of price), Emergency reserve, Minimum down payment (%) Open Calculator
- FHA Loan Calculator Calculate an FHA-style base loan, financed upfront MIP, monthly principal/interest, annual MIP estimate, taxes, insurance, HOA, and total housing payment. Inputs: Home price, Down payment (%), Mortgage rate (%), Term (years), Upfront MIP (%), Annual MIP (%), Annual property tax (% of price), Annual homeowners insurance, Monthly HOA Open Calculator
- Finance Calculator Solve future value, present value, periodic contribution, or annual rate for a level end-of-period time-value-of-money stream. Inputs: Solve for, Present value, Future value, Payment each period, Annual rate (%), Years, Periods per year Open Calculator
- HELOC Calculator Calculate HELOC available credit, interest-only draw payment, later amortizing repayment payment, payment shock, interest, and annual fees. Inputs: HELOC credit limit, Initial draw, Annual variable rate (%), Interest-only draw period (years), Repayment period (years), Annual fee Open Calculator
- Home Equity Loan Calculator Calculate available home-equity borrowing from maximum combined LTV, test a requested loan, and calculate its fixed payment and interest. Inputs: Current home value, First-mortgage balance, Maximum combined LTV (%), Requested equity loan, Equity-loan rate (%), Term (years) Open Calculator
- How Much House Can I Afford Calculator Estimate an affordable home price from income, debts, down payment, housing costs, and lending ratios. Inputs: Gross annual household income, Other monthly debt payments, Available down payment, Mortgage interest rate (%), Mortgage term (years), Annual property tax rate (%), Monthly insurance and HOA, Maximum housing ratio (%), Maximum total-debt ratio (%) Open Calculator
- Inflation Calculator Adjust an amount between two price-index levels and calculate cumulative inflation, annualized inflation, and purchasing-power loss. Inputs: Starting amount, Starting price index, Ending price index, Years between indices Open Calculator
- Interest Calculator Calculate simple, periodically compounded, or continuously compounded growth and effective annual rate. Inputs: Interest method, Principal, Annual rate (%), Years, Compounds per year Open Calculator
- Interest Rate Calculator Infer periodic, nominal annual, effective annual, and continuously compounded rates from present value, future value, term, and frequency. Inputs: Present value, Future value, Years, Compounds per year Open Calculator
- Investment Calculator Project an investment from an initial amount and monthly contributions with beginning- or end-of-month timing. Inputs: Initial investment, Monthly contribution, Annual return (%), Years, Contribution timing Open Calculator
- IRR Calculator Solve periodic internal rate of return from a cash-flow series and report NPV at both IRR and a comparison discount rate. Inputs: Cash flows from period 0 onward, Comparison rate per period (%) Open Calculator
- Lease Calculator Calculate a general finance-lease rental from asset value, residual, interest rate, term, and advance or arrears timing. Inputs: Asset value, Residual value, Annual interest rate (%), Term (months), Payment timing Open Calculator
- Mortgage Amortization Calculator Build yearly mortgage amortization and combine principal/interest with property tax, insurance, and HOA for total monthly housing payment. Inputs: Home price, Down payment, Mortgage rate (%), Term (years), Annual property tax, Annual homeowners insurance, Monthly HOA Open Calculator
- Mortgage Payoff Calculator Compare baseline mortgage payoff with monthly extra payments and a one-time lump sum, reporting months and interest saved. Inputs: Current mortgage balance, Annual rate (%), Scheduled P&I payment, Extra monthly payment, One-time lump sum, Month to apply lump sum Open Calculator
- Mutual Fund Calculator Project mutual-fund value after sales loads and expense ratio and compare it with a no-fee scenario. Inputs: Initial investment, Monthly contribution, Gross annual return (%), Annual expense ratio (%), Sales load (%), Years Open Calculator
- Payback Period Calculator Calculate fractional-year simple and discounted payback from an initial investment and annual cash-flow sequence. Inputs: Initial investment, Annual cash flows, Discount rate (%) Open Calculator
- Payment Calculator Calculate periodic installment payment at any annual frequency with an optional discounted balloon and monthly budget equivalent. Inputs: Principal, Annual rate (%), Term (years), Payments per year, Balloon payment Open Calculator
- Personal Loan Calculator Calculate personal-loan net proceeds after origination fee, scheduled payment, extra-payment payoff, interest, and all-in cost. Inputs: Requested loan amount, Origination fee (%), APR (%), Term (years), Extra monthly payment Open Calculator
- Refinance Calculator Compare current and refinanced mortgage payments, rolled or upfront costs, break-even months, and nominal lifetime payments. Inputs: Current mortgage balance, Current rate (%), Remaining term (years), New rate (%), New term (years), Refinance closing costs, Cash paid toward principal, Finance closing costs Open Calculator
- Rent Calculator Project annual rent escalation, final-year rent, cumulative rent, renters insurance, and refundable security-deposit cash outflow. Inputs: Starting monthly rent, Annual rent increase (%), Years, Monthly renters insurance, Refundable security deposit Open Calculator
- Rent vs Buy Calculator Compare cumulative rent with homeownership cash flows and net sale proceeds over a fixed whole-year horizon. Inputs: Starting monthly rent, Annual rent increase (%), Home price, Down payment (%), Mortgage rate (%), Mortgage term (years), Comparison horizon (whole years), Annual appreciation (%), Annual tax and maintenance (% of price), Buy closing costs (%), Selling costs (%) Open Calculator
- Rental Property Calculator Calculate effective rent, NOI, cap rate, mortgage debt service, annual cash flow, cash-on-cash return, DSCR, and break-even occupancy. Inputs: Purchase price, Down payment (%), Closing costs, Monthly scheduled rent, Vacancy (%), Monthly operating expenses, Annual property tax, Annual insurance, Mortgage rate (%), Mortgage term (years) Open Calculator
- Repayment Calculator Simulate payoff from current principal, APR, scheduled monthly payment, and extra payment with an amortization schedule. Inputs: Current principal, Annual rate (%), Scheduled monthly payment, Extra monthly payment Open Calculator
- Savings Calculator Project savings from a starting balance and monthly deposits, separating contributions from interest and comparing with a goal. Inputs: Starting balance, Monthly deposit, Annual rate (%), Years, Savings goal Open Calculator
- Student Loan Calculator Calculate interest accrued or subsidized during grace, repayment-start balance, scheduled payment, and extra-payment payoff. Inputs: Original principal, Annual rate (%), Grace period (months), Grace-period interest, Repayment term (years), Extra monthly payment Open Calculator
- VA Mortgage Calculator Calculate a VA-style base loan, entered funding fee paid or financed, principal/interest, taxes, insurance, HOA, and zero monthly mortgage insurance. Inputs: Home price, Down payment, Mortgage rate (%), Term (years), Applicable VA funding fee (%), Funding fee treatment, Annual property tax, Annual homeowners insurance, Monthly HOA Open Calculator
Tax and Planning Calculators
- 401(k) Calculator Project 401(k) balance from salary-based employee contributions, capped employer match, salary growth, investment return, inflation, and an optional current annual limit. Inputs: Current age, Retirement age, Current 401(k) balance, Annual salary, Employee contribution (% of salary), Employer match rate (% of matched contribution), Match applies up to salary (%), Annual salary growth (%), Annual investment return (%), Inflation (%), Current annual employee limit (0 for none) Open Calculator
- Estate Tax Calculator Estimate estate tax from gross estate, deductions, prior taxable gifts, entered exemption, marginal rate, and state estate tax. Inputs: Gross estate, Debts and administration expenses, Charitable deduction, Marital deduction, Prior taxable gifts, Applicable exemption amount, Estate-tax rate (%), State estate tax Open Calculator
- IRA Calculator Project Traditional or Roth IRA growth and simplified current-tax savings versus retirement-tax treatment. Inputs: IRA type, Starting balance, Annual contribution, Years, Annual return (%), Current marginal tax rate (%), Retirement tax rate (%) Open Calculator
- Marriage Tax Calculator Compare two individual progressive-tax calculations with one married-joint calculation using explicitly entered deductions and bracket schedules. Inputs: Person one income, Person two income, Person one deduction, Person two deduction, Joint deduction, Single brackets: upper limit, rate %, Joint brackets: upper limit, rate % Open Calculator
- Pension Calculator Compare a pension stream with a lump-sum offer using COLA, discount rate, retiree years, and survivor percentage/additional years. Inputs: Lump-sum offer, Monthly pension, Retiree payment years, Annual COLA (%), Discount rate (%), Survivor pension (%), Additional survivor years Open Calculator
- Real Estate Calculator Calculate a real-estate project or flip's all-in cost, net sale proceeds, profit, return on cost, annualized return, and break-even sale price. Inputs: Purchase price, Renovation cost, Purchase closing costs, Holding period (months), Monthly holding cost, Financing interest, Expected sale price, Selling costs (%) Open Calculator
- Retirement Calculator Project savings to retirement and present-value the inflation-growing portfolio withdrawals needed through life expectancy after other income. Inputs: Current age, Retirement age, Life expectancy age, Current retirement savings, Annual contribution, Pre-retirement return (%), Post-retirement return (%), Inflation (%), Desired annual retirement income in today's money, Other annual retirement income in today's money Open Calculator
- RMD Calculator Calculate a required minimum distribution from prior year-end balance using the IRS Uniform Lifetime Table or a user-supplied divisor, with Roth owner handling. Inputs: Account type, Age in distribution year, Prior December 31 balance, Life-expectancy table, Custom divisor Open Calculator
- Roth IRA Calculator Project Roth IRA growth and compare it with a simplified taxable account subject to annual return tax drag. Inputs: Starting Roth balance, Annual contribution, Years, Annual return (%), Tax rate on taxable account return (%) Open Calculator
- Salary Calculator Convert pay among hourly, daily, weekly, biweekly, semimonthly, monthly, and annual amounts using entered work schedule and unpaid days. Inputs: Pay amount, Pay period, Hours per workday, Workdays per week, Unpaid holidays/vacation days Open Calculator
- Social Security Calculator Adjust an official full-retirement-age benefit for claim age using SSA early-claim reductions and entered delayed credits, then project COLA-adjusted lifetime benefits. Inputs: Birth year, Official monthly benefit at full retirement age, Claim age (years), Additional claim-age months, Life expectancy age, Annual COLA (%), Delayed credit per year (%) Open Calculator
- Take Home Pay Calculator Calculate annual and per-paycheck take-home pay from entered progressive brackets, deductions, payroll tax, and state/local rate. Inputs: Annual gross pay, Pay periods per year, Annual pre-tax deductions, Income-tax deduction, Income-tax brackets: upper, rate %, Payroll tax (%), State/local tax (%), Annual post-tax deductions Open Calculator
- Income Tax Calculator Calculate progressive ordinary-income tax plus an entered preferential-rate income tax, credits, liability, amount owed, or refund. Inputs: Ordinary income, Preferential-rate income, Deductions, Ordinary brackets: upper, rate %, Preferential tax rate (%), Tax credits, Tax already paid Open Calculator
- VAT Calculator Solve net amount, VAT amount, and VAT-inclusive gross amount from a known net, gross, or tax value and entered VAT rate. Inputs: Known amount, Known amount, VAT rate (%) Open Calculator
Health Calculators
- BMI Calculator Calculate body mass index from height and weight. Inputs: Weight kg, Height cm Open Calculator
- BMR Calculator Calculate basal metabolic rate using the Mifflin-St Jeor equation. Inputs: Sex, Weight kg, Height cm, Age years Open Calculator
- TDEE Calculator Calculate total daily energy expenditure from BMR and activity multiplier. Inputs: Sex, Weight kg, Height cm, Age years, Activity level Open Calculator
- Body Fat Calculator Estimate body fat percentage with the U.S. Navy circumference method. Inputs: Sex, Height cm, Neck cm, Waist cm, Hip cm Open Calculator
- Anorexic BMI Calculator Calculate adult BMI, WHO-style thinness bands, and the weight corresponding to BMI 18.5 without presenting BMI as an anorexia diagnosis. Inputs: Age (adult years), Weight (kg), Height (cm) Open Calculator
- Army Body Fat Calculator Apply the current U.S. Army waist-to-height screening benchmark or calculate the rescinded 2023 one-site body-fat estimate for historical comparison. Inputs: Assessment method, Height and waist unit, Height, Waist at navel, Sex for historical equation, Weight for historical equation, Weight unit Open Calculator
- BAC Calculator Estimate blood alcohol concentration from explicit drink volumes and ABV, body weight, sex-specific Widmark ratio, elapsed time, and elimination rate. Inputs: Sex used by Widmark estimate, Body weight (kg), Drinks: servings, mL each, ABV %, Hours since drinking ended, BAC percentage points eliminated/hour Open Calculator
- Body Surface Area Calculator Estimate body surface area with the Mosteller, Du Bois, Haycock, Gehan-George, and Boyd equations. Inputs: Weight (kg), Height (cm) Open Calculator
- Body Type Calculator Classify fashion-industry body shape from bust, waist, high-hip, and hip measurements and report waist-to-hip ratio separately. Inputs: Measurement unit, Bust circumference, Waist circumference, High-hip circumference, Full-hip circumference Open Calculator
- Bra Size Calculator Estimate a starting bra size from full-bust and snug-underbust measurements and show US, UK, EU, French, and Australian equivalents. Inputs: Measurement unit, Full bust circumference, Snug underbust circumference Open Calculator
- Calorie Calculator Estimate BMR, maintenance calories, and a weight-change calorie target with Mifflin-St Jeor or body-fat-based Katch-McArdle. Inputs: Age (adult years), Sex used by Mifflin-St Jeor, Weight (kg), Height (cm), BMR formula, Body-fat percentage for Katch-McArdle, Activity level, Goal change kg/week (negative for loss) Open Calculator
- Calories Burned Calculator Estimate gross and net activity calories from body weight, duration, and a named activity's MET value. Inputs: Weight (kg), Activity duration (minutes), Activity MET value Open Calculator
- Carbohydrate Calculator Convert a daily calorie target and carbohydrate percentage range into calories and grams per day. Inputs: Daily calories (kcal), Lower carbohydrate percentage, Upper carbohydrate percentage Open Calculator
- Conception Calculator Estimate conception timing and the intercourse window from a target due date or a known last menstrual period. Inputs: Known date, Reference date, Average cycle length (days) Open Calculator
- Fat Intake Calculator Convert calorie intake into a configurable total-fat gram range and saturated-fat gram limit. Inputs: Daily calories (kcal), Lower total-fat percentage, Upper total-fat percentage, Saturated-fat limit percentage Open Calculator
- GFR Calculator Estimate adult GFR with the race-free 2021 CKD-EPI creatinine equation or pediatric GFR with revised bedside Schwartz. Inputs: Patient equation, Serum creatinine, Creatinine unit, Age (years), Sex used by adult equation, Height for pediatric equation (cm) Open Calculator
- Healthy Weight Calculator Calculate an adult BMI-based weight interval for a given height, with editable lower and upper BMI boundaries. Inputs: Height (cm), Lower BMI boundary, Upper BMI boundary Open Calculator
- Child Height Predictor Calculator Estimate a child's adult height from parental heights using the mid-parental method and show metric and US customary results. Inputs: Mother's height (cm), Father's height (cm), Child's sex for the estimate Open Calculator
- Ideal Weight Calculator Compare the Devine, Robinson, Miller, and Hamwi historical ideal-body-weight equations with the BMI 18.5-24.9 range. Inputs: Sex used by the historical equations, Height (cm, at least 152.4) Open Calculator
- Lean Body Mass Calculator Estimate lean body mass with the Boer, James, and Hume equations and compare their average with total body weight. Inputs: Sex used by the equations, Weight (kg), Height (cm) Open Calculator
- Macro Calculator Split a calorie target into exact protein, carbohydrate, and fat calorie and gram targets using percentages that must total 100. Inputs: Daily calories (kcal), Protein (%), Carbohydrate (%), Fat (%) Open Calculator
- Molecular Weight Calculator Parse chemical formulas with all 118 element symbols, nested parentheses/brackets, coefficients, and hydrate separators to calculate molar mass and composition. Inputs: Chemical formula Open Calculator
- One Rep Max Calculator Estimate one-repetition maximum with Epley, Brzycki, Lombardi, and combined estimates. Inputs: Weight lifted, Completed repetitions, Displayed estimate Open Calculator
- Overweight Calculator Calculate adult BMI category and quantify weight above the BMI-25 threshold for the entered height. Inputs: Age (adult years), Weight (kg), Height (cm) Open Calculator
- Ovulation Calculator Predict ovulation, six-day fertile windows, and corresponding due dates across up to twelve regular cycles. Inputs: Last period start, Average cycle length (days), Cycles to predict Open Calculator
- Pace Calculator Convert race distance and elapsed time into pace per kilometer, pace per mile, and average speed. Inputs: Distance, Distance unit, Hours, Minutes, Seconds Open Calculator
- Period Calculator Project future period start and end dates from the last known start, average cycle length, and typical bleeding duration. Inputs: Last period start, Average cycle length (days), Typical period length (days), Periods to predict Open Calculator
- Pregnancy Calculator Calculate due date, estimated LMP and conception, gestational age, trimester, and milestones from five pregnancy dating methods. Inputs: Dating method, Reference date, Calculate gestational age as of, Cycle length (days), Ultrasound gestational weeks, Ultrasound gestational days, IVF embryo age at transfer (days) Open Calculator
- Pregnancy Conception Calculator Back-calculate a central conception estimate and uncertainty window from a due date, last period, or dated ultrasound. Inputs: Known dating information, Known date, Cycle length (days), Scan gestational weeks, Scan gestational days Open Calculator
- Pregnancy Weight Gain Calculator Apply CDC/IOM pre-pregnancy BMI ranges for singleton or twin total weight gain and compare current singleton gain with a week-specific model. Inputs: Pre-pregnancy weight (kg), Current weight (kg), Height (cm), Gestational week, Pregnancy Open Calculator
- Protein Calculator Calculate a weight-based daily protein range for sedentary adults, older adults, endurance or strength training, or pregnancy. Inputs: Weight (kg), Activity or life-stage category Open Calculator
- Shoe Size Conversion Calculator Convert among measured foot length, Mondopoint, US, UK, and EU shoe sizes with separate men's, women's, and children's formulas. Inputs: Sizing category, Size or foot-length value, Source system Open Calculator
- Sleep Calculator Calculate bedtimes from a required wake time or wake times from a bedtime using configurable latency, cycle length, and cycle count. Inputs: Calculate, Clock time (24-hour HH:MM), Time to fall asleep (minutes), Estimated cycle length (minutes), Minimum cycles, Maximum cycles Open Calculator
- Target Heart Rate Calculator Calculate exercise zones with either percent of estimated maximum heart rate or the Karvonen heart-rate-reserve method. Inputs: Age (years), Resting heart rate (bpm), Maximum HR estimate, Zone method, Lower intensity (%), Upper intensity (%) Open Calculator
- Weight Calculator Convert mass among kilograms, metric units, pounds, ounces, stones, tons, carats, grains, and unified atomic mass units. Inputs: Mass value, From unit, To unit Open Calculator
- Weight Watchers Points Calculator Estimate food points with one of three clearly dated historical formulas while distinguishing them from current proprietary personalized programs. Inputs: Historical points system, Calories, Protein (g), Carbohydrates (g), Total fat (g), Saturated fat (g), Sugar (g), Fiber (g) Open Calculator
Date and Time Calculators
- Age Calculator Calculate age in years, months, and days between two dates. Inputs: Birth date, As of date Open Calculator
- Date Difference Calculator Calculate the signed and absolute calendar-day difference between two dates. Inputs: Start date, End date Open Calculator
- Time Duration Calculator Calculate duration between two times on the same day. Inputs: Start time, End time Open Calculator
- Date Calculator Add or subtract calendar years, months, weeks, and days from a starting date with end-of-month handling. Inputs: Starting date, Operation, Calendar years, Calendar months, Weeks, Days Open Calculator
- Day Counter Count calendar days, weekdays, weekend days, and business days between two dates with optional holiday exclusions. Inputs: Start date, End date, Include both boundary dates, Holiday dates to exclude from business days Open Calculator
- Day of the Week Calculator Find a date's weekday, ordinal day, ISO week date, quarter, and leap-year status. Inputs: Calendar date Open Calculator
- Pregnancy Due Date Calculator Estimate pregnancy due date from LMP, conception, IVF transfer, or ultrasound gestational age and show key milestones. Inputs: Dating method, Reference date, Usual menstrual cycle length (days), Gestational weeks on ultrasound date, Additional gestational days on ultrasound date Open Calculator
- Hours Calculator Add and subtract a list of hour-minute-second durations and report exact and decimal totals. Inputs: Durations, one per line Open Calculator
- Time Calculator Add or subtract two day-hour-minute-second durations and normalize the signed result. Inputs: First duration days, First duration hours, First duration minutes, First duration seconds, Operation, Second duration days, Second duration hours, Second duration minutes, Second duration seconds Open Calculator
- Time Card Calculator Calculate daily and weekly paid hours, overtime, and gross pay from timestamped shifts and unpaid breaks. Inputs: Shifts: label,start,end,unpaid break minutes, Weekly overtime threshold (hours), Regular hourly rate, Overtime pay multiplier Open Calculator
- Time Zone Calculator Convert a wall-clock date and time between explicit UTC offsets without hidden browser-zone assumptions. Inputs: Local date and time (YYYY-MM-DD HH:MM[:SS]), From UTC offset hours, To UTC offset hours Open Calculator
Geometry and Construction Calculators
- Pythagorean Theorem Calculator Calculate the hypotenuse from two right-triangle legs. Inputs: Leg a, Leg b Open Calculator
- Circle Calculator Calculate diameter, circumference, and area from radius. Inputs: Radius Open Calculator
- Area Calculator Calculate area for rectangle, triangle, or circle. Inputs: Shape, Length/base/radius, Width/height Open Calculator
- Volume Calculator Calculate volume for box, cylinder, or sphere. Inputs: Shape, Length/radius, Width/height, Height Open Calculator
- Concrete Calculator Estimate concrete volume, bag counts, waste allowance, and cost for slabs, walls, footings, or round columns. Inputs: Concrete shape, Length (ft), Width (ft), Thickness (in), Height (ft), Column diameter (in), Waste allowance (%), Price per cubic yard Open Calculator
- Gravel Calculator Estimate compacted gravel volume, purchase volume, weight, and cost from area, depth, density, and waste. Inputs: Area length (ft), Area width (ft), Compacted depth (in), Gravel density (tons/yd3), Waste/compaction allowance (%), Price per ton Open Calculator
- Mulch Calculator Estimate mulch volume and the number of bags required from area, depth, waste, and bag size. Inputs: Bed area (ft2), Mulch depth (in), Waste allowance (%), Bag volume (ft3), Price per bag Open Calculator
- Right Triangle Calculator Calculate hypotenuse, perimeter, area, and acute angles from the two perpendicular legs of a right triangle. Inputs: Leg a, Leg b Open Calculator
- Roofing Calculator Estimate sloped roof area, roofing squares, bundles, waste, and material cost from plan dimensions and pitch. Inputs: Plan length (ft), Plan width (ft), Roof pitch rise per 12, Waste allowance (%), Coverage per bundle (ft2), Price per bundle Open Calculator
- Square Footage Calculator Total the area and perimeter of multiple rectangular rooms or sections entered on separate rows. Inputs: Sections: label,length ft,width ft Open Calculator
- Stair Calculator Design a straight stair from total rise, target riser height, tread depth, and stair width. Inputs: Total rise (in), Target maximum riser height (in), Tread depth/run per step (in), Stair width (in) Open Calculator
- Surface Area Calculator Calculate total surface area and volume for a rectangular prism, cube, sphere, cylinder, or cone. Inputs: Solid shape, Length or cube side, Width, Height, Radius Open Calculator
- Tile Calculator Estimate tile count, purchase area, boxes, grout-line effect, waste, and cost for a rectangular installation. Inputs: Installation length (ft), Installation width (ft), Tile length (in), Tile width (in), Grout width (in), Waste allowance (%), Tiles per box, Price per box Open Calculator
- Tire Size Calculator Compare two metric tire sizes, including sidewall, overall diameter, circumference, revolutions, clearance, and speedometer error. Inputs: Current tire width (mm), Current aspect ratio (%), Current rim diameter (in), New tire width (mm), New aspect ratio (%), New rim diameter (in), Indicated speed Open Calculator
- Triangle Calculator Solve perimeter, area, semiperimeter, and all angles of a triangle from three side lengths. Inputs: Side a, Side b, Side c Open Calculator
Science and Engineering Calculators
- Distance from Speed and Time Calculator Calculate travel distance from speed and elapsed time. Inputs: Speed, Time Open Calculator
- Speed Calculator Calculate speed from distance and time. Inputs: Distance, Time Open Calculator
- Density Calculator Calculate density from mass and volume. Inputs: Mass, Volume Open Calculator
- Ohms Law Calculator Calculate voltage, current, resistance, and power when voltage and current are entered. Inputs: Voltage, Current Open Calculator
- BTU Calculator Estimate room cooling capacity from floor area, ceiling height, occupants, room use, insulation, sun exposure, and climate. Inputs: Floor area (ft2), Ceiling height (ft), Regular occupants, Room type, Insulation, Sun exposure, Summer climate Open Calculator
- Dew Point Calculator Solve dew point, relative humidity, or air temperature from the other two values using the August-Roche-Magnus relation. Inputs: Solve for, Air temperature (C), Relative humidity (%), Dew point (C) Open Calculator
- Electricity Calculator Estimate appliance energy use, monthly and annual electricity cost, and optional emissions from power and operating time. Inputs: Appliance power, Power unit, Average load/capacity (%), Use per day (hours), Use days per month, Electricity price per kWh, Emission factor kg CO2e/kWh Open Calculator
- Engine Horsepower Calculator Estimate quarter-mile engine horsepower from elapsed time or trap speed with explicit vehicle-weight conversion. Inputs: Quarter-mile method, Vehicle weight, Weight unit, Quarter-mile elapsed time (seconds), Quarter-mile trap speed, Trap speed unit Open Calculator
- Half-Life Calculator Solve any variable in exponential half-life decay and convert among half-life, decay constant, and mean lifetime. Inputs: Solve for, Initial amount, Remaining amount, Elapsed time, Half-life Open Calculator
- Horsepower Calculator Calculate mechanical power and convert it to watts, kilowatts, mechanical horsepower, and metric horsepower. Inputs: Force, Force unit, Distance, Distance unit, Time, Time unit Open Calculator
- Mass Calculator Calculate mass from density and volume with independent density and volume unit conversion. Inputs: Density, Density unit, Volume, Volume unit Open Calculator
- Molarity Calculator Solve mass, molar mass, solution volume, or molarity from the other three quantities. Inputs: Solve for, Solute mass (g), Molar mass (g/mol), Solution volume (L), Molarity (mol/L) Open Calculator
- Resistor Calculator Decode 4-band or 5-band resistor colors or calculate equivalent resistance for series and parallel networks. Inputs: Calculation mode, Resistances in ohms, Color bands, First significant band, Second significant band, Third significant band (5-band), Multiplier band, Tolerance band Open Calculator
- Voltage Drop Calculator Calculate resistive voltage drop for DC, single-phase AC, or three-phase AC circuits from current, length, and conductor resistance. Inputs: Circuit type, Load current (A), One-way conductor length, Length unit, Conductor resistance, Resistance unit, Supply voltage (V), Power factor (AC) Open Calculator
- Wind Chill Calculator Calculate National Weather Service wind chill from air temperature and wind speed with formula-validity checks. Inputs: Air temperature, Temperature unit, Wind speed, Wind speed unit Open Calculator
Lifestyle Calculators
- Golf Handicap Calculator Estimate a WHS Handicap Index from 3 to 20 eligible 18-hole rounds, or convert an existing index into Course and Playing Handicaps. Inputs: Calculation, Rounds: adjusted score, Course Rating, Slope Rating, optional PCC, Handicap Index, Slope Rating, Course Rating, Course par, Handicap allowance (%) Open Calculator
- GPA Calculator Calculate term and cumulative GPA from course credits and letter or numeric grade points, with a selectable A+ scale. Inputs: Courses: name, credits, letter or grade points, A+ grade-point value, Prior GPA (optional), Prior completed credits (optional) Open Calculator
- Grade Calculator Calculate a weighted course grade and the average required on remaining assignments to reach a target grade. Inputs: Completed items: label, score %, course weight %, Target final course grade (%), Remaining course weight (%) Open Calculator
- Love Calculator Generate a clearly labeled entertainment name score and summarize four user-entered relationship check-in ratings without claiming predictive validity. Inputs: First name, Second name, Communication rating (0-10), Trust rating (0-10), Shared values rating (0-10), Conflict-resolution rating (0-10) Open Calculator
Unit Conversion Calculators
- Conversion Calculator Convert dropdown-selected units across length, area, volume, mass, time, temperature, pressure, energy, physics, chemistry, biology, space, air, and digital quantities. Inputs: Value to convert, From unit, To unit Open Calculator
- Length and Land Unit Conversion Calculator Convert dropdown-selected linear length or land-area units, including kilometer, meter, yard, marla, kanal, acre, and square feet. Inputs: Value to convert, From unit, To unit, Marla/kanal land standard Open Calculator
Developer Tools
- Base64 Encode Decode Encode or decode Base64 text. Inputs: Text, Mode Open Calculator
- URL Encode Decode Encode or decode URL text. Inputs: Text, Mode Open Calculator
- Bandwidth Calculator Convert data units, calculate transfer time, estimate website traffic, or convert monthly usage to average bandwidth. Inputs: Calculation mode, Data value, Data unit, File size, File size unit, Connection bandwidth, Bandwidth unit, Protocol overhead (%), Monthly page views, Average page size, Average page size unit, Traffic redundancy factor, Monthly data usage, Monthly usage unit Open Calculator
- Binary Calculator Add, subtract, multiply, or divide binary integers and convert the exact result to decimal, octal, and hexadecimal. Inputs: First binary integer, Operation, Second binary integer Open Calculator
- Virtual Dice Roller Roll any supported number of fair virtual dice, display each die face, and summarize the roll. Inputs: Number of dice, Sides per die Open Calculator
- Hex Calculator Perform exact hexadecimal integer arithmetic and convert results to decimal, binary, and octal. Inputs: First hexadecimal integer, Operation, Second hexadecimal integer Open Calculator
- IP Subnet Calculator Calculate IPv4 or IPv6 network ranges from an address and CIDR prefix, including masks and host counts where applicable. Inputs: IPv4 or IPv6 address (CIDR suffix allowed), CIDR prefix length Open Calculator
- Random Password Generator Generate one or more cryptographically random passwords with explicit character-set and ambiguity controls. Inputs: Password length, Number of passwords, Include lowercase, Include uppercase, Include numbers, Include symbols, Exclude ambiguous characters Open Calculator
- Random Number Generator Generate up to 10,000 uniform random integers with optional uniqueness and no hidden 100-number cap. Inputs: Minimum integer, Maximum integer, How many integers, Allow duplicates Open Calculator
- Roman Numeral Converter Convert Arabic integers, Roman numerals, or separated date components in either direction with canonical validation. Inputs: Arabic number, Roman numeral, or separated date Open Calculator