Ohms Law Calculator Ohm’s Law Calculator Current (I): Amperes (A) mA (milliamperes) kA (kiloamperes) Resistance (R): Ohms (Ω) mΩ (milliohms) kΩ (kiloohms) MΩ (megaohms) Voltage (V): Volts (V) mV (millivolts) kV (kilovolts) Please enter any 2 values to calculate the 3rd. Calculate Reset