Solve Ohm's Law and power — enter any two of Voltage, Current, Resistance, or Power to get the other two.
Ohm's Law Calculator
Electrical
Inputs
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Enter any two of the four values — Voltage, Current, Resistance, Power.
Leave the other two fields blank.
Click Calculate to solve for the rest using Ohm's Law.
Ohm's Law: V = I × R. Power: P = V × I = I²R = V²/R. Enter any two knowns and the calculator derives the other two. Used widely in electronics, circuit design, and troubleshooting.
It states that voltage equals current times resistance: V = I × R. It is the fundamental relationship in electric circuits for resistive loads.