Electrical Power Calculator

Calculate voltage, current, resistance, or power using Ohm's law. Enter any two values.

P = V × I = V² / R = I² × R

Input — Enter Any Two Values

Voltage (V) Volts

Current (I) Amperes

Resistance (R) Ohms

Power (P) Watts

Voltage (V) —

Current (I) —

Resistance (R) —

Power (P) —

Energy (per hour) —

Given V and I: R = V/I, P = V×I

Given V and R: I = V/R, P = V²/R

Given I and R: V = I×R, P = I²×R

Given V and P: I = P/V, R = V²/P

Given I and P: V = P/I, R = P/I²

Given R and P: V = √(P×R), I = √(P/R)