Ohm's Law Calculator

Enter any two values to solve for the other two. Covers voltage, current, resistance, and power.

V = I × R  |  P = V × I
Voltage (V) · Current (I) · Resistance (R) · Power (P)
V
A
Ω
W
Formula reference
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