Ohm's Law Calculator

Calculate Voltage, Current, Resistance or Power — enter any two known values.

Calculate

Known values

current (Current (I))

resistance (Resistance (R))

Formulas Reference

V = I × R

Ohm's Law

P = V × I

Power (basic)

P = I² × R

Power (from I, R)

P = V² / R

Power (from V, R)

I = V / R

Current

R = V / I

Resistance