Ohm's Law Calculator Ohm's Law Calculator Enter any two values (Voltage, Current, Resistance) to calculate the others. Voltage (V) V Calculate Voltage Current (I) A Calculate Current Resistance (R) Ω (Ohms) kΩ (Kiloohms) MΩ (Megaohms) Calculate Resistance Power (P) W (Watts) kW (Kilowatts) MW (Megawatts) Calculate Power Reset All Download PDF