Science and Engineering Calculators
Voltage Drop Calculator
Voltage Drop Calculator calculate resistive voltage drop for DC, single-phase AC, or three-phase AC circuits from current, length, and conductor resistance.
Science and Engineering Calculators
Voltage Drop Calculator
Calculate resistive voltage drop for DC, single-phase AC, or three-phase AC circuits from current, length, and conductor resistance.
Formula
DC/single-phase drop = 2 I L R (x power factor for the resistive AC approximation); three-phase drop = sqrt(3) I L R x power factor. L is one-way length and R is ohms per unit length.
About the Voltage Drop Calculator
Calculate resistive voltage drop for DC, single-phase AC, or three-phase AC circuits from current, length, and conductor resistance. Science and engineering calculators solve the displayed physical, chemical, electrical, mechanical, or environmental relationship.
How the Voltage Drop Calculator Works
DC/single-phase drop = 2 I L R (x power factor for the resistive AC approximation); three-phase drop = sqrt(3) I L R x power factor. L is one-way length and R is ohms per unit length.
The calculation runs in your browser. Submitted values are validated for the required numeric range, data shape, units, and method-specific restrictions before a result is shown.
Required Inputs
- Circuit type (required) Options: DC, Single-phase AC, Three-phase AC
- Load current (A) (required)
- One-way conductor length (required)
- Length unit (required) Options: Meters, Feet
- Conductor resistance (required)
- Resistance unit (required) Options: Ohm/km, Ohm/1000 ft
- Supply voltage (V) (required)
- Power factor (AC) (required)
Results Reported
The result panel shows the final answer together with the intermediate quantities needed to audit the calculation. Depending on this method, reported values include:
phaseone_way_length_mresistance_ohm_per_mcircuit_length_factorcircuit_resistance_ohmsvoltage_drop_voltsvoltage_drop_percentload_voltagepower_loss_watts
Voltage Drop Calculator Example
Use the example data button, calculate, then review the result table, formula, and worked solution before using the answer.
| Input | Example value |
|---|---|
| Circuit type | dc |
| Load current (A) | 10 |
| One-way conductor length | 100 |
| Length unit | meter |
| Conductor resistance | 1 |
| Resistance unit | ohm_per_km |
| Supply voltage (V) | 120 |
| Power factor (AC) | 1 |
How to Use the Calculator
- Confirm that the calculator title and method match the quantity, test, conversion, or planning question you need to solve.
- Enter values with compatible units and the requested sample, group, matrix, count, date, or option format.
- Select Example Data to inspect a valid input layout, or enter your own values and select Calculate.
- Review the result table, formula, worked substitutions, warnings, and interpretation rather than using only the headline number.
- Use Copy Result or Download CSV when you need a reusable record of the displayed calculation.
Understanding the Result
Keep units compatible and confirm that idealized constants, operating conditions, and model assumptions fit the real system.
Keep the entered values, units, selected options, and any warning shown beside the result. For a hypothesis test, report the statistic, degrees of freedom where applicable, p-value, alpha level, effect size, and decision. For an estimate or conversion, report the formula convention and final unit.
Accuracy and Limitations
The calculator keeps full browser precision during calculation and rounds only for display. Accuracy still depends on correct inputs and on whether the displayed model represents the real problem. Educational calculators cannot replace required professional review, current official rules, field measurements, laboratory methods, or specialist statistical software where those are necessary.
Frequently Asked Questions
What does the Voltage Drop Calculator calculate?
Calculate resistive voltage drop for DC, single-phase AC, or three-phase AC circuits from current, length, and conductor resistance.
Which formula does the Voltage Drop Calculator use?
DC/single-phase drop = 2 I L R (x power factor for the resistive AC approximation); three-phase drop = sqrt(3) I L R x power factor. L is one-way length and R is ohms per unit length.
Is this a separate calculator?
Yes. This page has its own public URL, inputs, formula notes, browser function, fixture, and worked solution.
What should I verify before using the answer?
Check the entered values, units, selected options, formula convention, warnings, and result interpretation shown on this calculator page.