Ohm's Law Calculator
Solve for voltage, current, resistance, or power — enter any two known values.
Fill any two fields — the rest update live.
VVoltage
volts · supports k, m
ICurrent
amps · m = mA, u = µA
RResistance
ohms · k = kΩ, M = MΩ
PPower
watts · m = mW
V = I × RI = V / R R = V / I
P = V × IP = I² × R P = V² / R