How do I choose the unknown physics variable?

Select the question-mark control next to the variable to solve, then enter values and units for the remaining quantities.

Are physical constants entered automatically?

Yes. Constants required by the selected formula are displayed with their SI values and are included automatically.

Can the solver convert units?

Yes. Each quantity offers compatible units. Values are converted to SI for calculation and then converted to the selected result unit.

How do I choose the unknown physics variable?

Select the question-mark control beside one non-constant variable, then enter the remaining known values and units.

Are physical constants inserted automatically?

Yes. Required constants are displayed with their values and included automatically.

Does the solver cover electricity and magnetism?

Yes. The library includes electrostatics, circuits, magnetism, electromagnetic induction, AC and electromagnetic-wave formulas.

Physics Formula Solver: Search Equations, Units & Steps

Search • choose unknown • convert • solve

Physics Formula Solver with Units

Search a verified formula from major physics branches, mark any non-constant quantity with a question mark, enter the known values in compatible units and receive the answer with automatic constants, SI conversion, substitution steps, dimensional guidance and a live formula visual.

Loading formula libraryAutomatic constantsUnit-aware inputsUnknown-variable selectorLocal calculation

1. SearchFormula, branch, variable or concept

2. Select ?Choose exactly one unknown

3. Enter unitsCompatible choices per quantity

4. SolveSteps, checks, graph and result

Formula library

Search names such as projectile range, Ohm's law, Doppler effect or photon energy.

0 matches

Search physics formulasPhysics branch

Mechanics

Select a formula

Choose a formula from the searchable library.

—

Choose the unknown and enter known values

The question-mark button disables that value input. Constants appear automatically and cannot be edited.

Answer unitSignificant figures

Calculated physics result

Complete a formula to see the solution

Waiting

How to use the physics formula solver

Search by formula name, physical concept, branch, symbol or variable description. After selecting a formula, mark one variable as unknown, enter the remaining values and choose the unit beside each value. The calculator converts the known quantities to SI, solves the selected relation and converts the result into the requested answer unit.

Automatic constants and reference values

Equations involving the gravitational constant, speed of light, Planck constant, elementary charge, vacuum permittivity, Boltzmann constant, gas constant or standard gravity display those constants automatically. A constant is shown in the variable list so the user can see exactly what entered the calculation.

Compatible unit selection

Each quantity receives only units belonging to its dimension. Length variables cannot be assigned mass units, and voltage variables cannot be assigned time units. Affine temperature conversions are handled separately from multiplicative SI conversions.

Formula assumptions and valid domains

Physics formulas are models with assumptions. The selected formula card and solution report state common restrictions such as constant acceleration, ideal-gas behavior, small-angle approximation, thin-lens geometry or non-relativistic motion. A numerically valid value does not remove those physical conditions.

Physics branches covered

Scope: the library is broad and searchable, but physics contains specialized equations whose use depends on a particular model, material, geometry or convention. Unsupported formulas should be added as verified entries rather than invented from a question.

Physics formula solver questions

Can I solve for any variable in a formula?

Every non-constant variable can be selected as the unknown. Direct rearrangements are used where defined; otherwise the calculator uses a controlled numerical root solver and reports the method.

Does it use SI units only?

No. Inputs include SI, common scientific, Imperial and US customary units where appropriate. Calculations use SI internally to keep the equation consistent.

What happens when an equation has more than one mathematical root?

The calculator reports the selected principal physical root and warns when another root may exist. Constraints such as positive length or non-negative energy are applied where the physical quantity requires them.

Are calculations sent to another website?

No. The formula library, unit conversion, root solving, diagrams and relationship graph run from files contained in the plugin.