Ohm’s Law Calculator Enter any two values (V, A, Ω). The calculator finds the missing one and power (W). Voltage (V) Current (A) Resistance (Ω) Calculate Reset Result Voltage (V): — Current (A): — Resistance (Ω): — Power (W): — Formulas: V = I×R, I = V/R, R = V/I, P = V×I