Ohm's Law Calculator

Calculate voltage, current, resistance, and power using Ohm's law

Enter Values (2 or more)

Voltage V (Volts)

Current I (Amps)

Resistance R (Ohms)

Power P (Watts)

Formulas

V = I × R

Voltage = Current × Resistance

I = V / R

Current = Voltage / Resistance

R = V / I

Resistance = Voltage / Current

P = V × I

Power = Voltage × Current

P = I² × R

Power = Current² × Resistance

P = V² / R

Power = Voltage² / Resistance

V = √(P × R)

Voltage = √(Power × Resistance)

I = √(P / R)

Current = √(Power / Resistance)