Ohms calculatorOhm’s Law Calculator Voltage (V) = Current (I) * Resistance (R) Power (P) = Voltage (V) * Current (I) Enter any two known values and press “Calculate” to solve for the others. Voltage (V) Volts (V) Current (I) Amps (A) Resistance (R) Ohms (Ω) Power (P) Watts (W)