# Ohm's Law Calculator

> Solve Ohm's law and the power relationships. Enter any two of voltage, current, resistance, or power; the calculator returns the other two with the formulas used.

**URL:** https://www.calculatoranswers.com/ohms-law-calculator
**Category:** Education

## Quick Answer

Calculate voltage, current, resistance, and power using Ohm's law. Enter exactly two known values, pick the unit under each field (mV, mA, kilohms and so on), and the other two are computed in base units.

## Definition

An Ohm's law calculator is an academic physics utility that computes electrical relationships using the formula voltage equals current multiplied by resistance. Each field carries a unit selector covering the prefixes electronics work actually uses, so 12 mA can be entered as 12 with mA selected rather than converted by hand. Results are always reported in base units: volts, amperes, ohms and watts. By entering any two known variables, the calculator applies algebraic Ohm's law and Joule's law equations to solve for the two unknown parameters. Physics students, electronics hobbyists, and technicians use this tool to verify circuit parameters and prevent component damage.

## How to Use

1. **Enter two known values** — Input two electrical values of your choice among voltage, current, resistance, or power.
2. **Pick the unit for each value** — Type the number, then choose its unit from the selector beneath the field. Volts, amperes, ohms and watts are the defaults, so a value already in base units needs no change.
3. **Read calculated values** — View the computed electrical parameters along with the formulas used for calculation.

## Disclaimer

This calculator provides estimates for educational and planning purposes. Always consult a qualified professional for specific advice on financial, medical, legal, or other regulated decisions.

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