Electricity Calculator

Ohm's Law Calculator

Calculate voltage, current, resistance, or power using Ohm's Law: V = I × R and P = V × I

I want to calculate:

Voltage (V) in volts

Current (I) in amperes

Resistance (R) in ohms

Power (P) in watts

Ohm's Law Formulas

Voltage (V)

V = I × R

V = P / I

V = √(P × R)

Current (I)

I = V / R

I = P / V

I = √(P / R)

Resistance (R)

R = V / I

R = V² / P

R = P / I²

Power (P)

P = V × I

P = I² × R

P = V² / R