Electrical Power Calculator

Enter any two known values and this tool solves for the other two using Ohm's Law (V = IR) and the power equations.

P = V × I | V = I × R | P = I² × R | P = V² / R

Fill in exactly 2 fields. Leave the other 2 blank to solve for them.

P — Power (Watts)

V — Voltage (Volts)

I — Current (Amps)

R — Resistance (Ohms)

Enter exactly 2 values to solve for the other 2.