Voltage · current · resistance

Ohm's Law / Power Calculator

Enter any two of voltage, current, resistance, or power and get the other two — the classic Ohm's Law and power calculator.

Bench tool

V = I × R P = V × I R = V / I P = I² × R
V
A
Ω
W

Fill in any two fields — the remaining two calculate automatically. Clear a field to edit a different pair.