Electrical Power Calculator (P, V, I, R)

Your details

DC circuits use true power directly. AC circuits apply a power factor (pf) so apparent power S = P / pf.
Select which quantity you want the calculator to compute. Provide the other two.
Prefix for the power value you entered.
Voltage (potential difference) in the selected prefix.
Prefix for the voltage value you entered.
Electric current in the selected prefix.
Prefix for the current value you entered.
Resistance in the selected prefix.
Prefix for the resistance value you entered.
Extend the result to show how much it costs to run the load for a chosen number of hours.
Power (P)Watt range
60W

Real electrical power (watts)

Voltage (V)120V
Current (I)0.5A
Resistance (R)240Ω
Power (formatted)60.00 W
Voltage (formatted)120.0 V
Current (formatted)500.0 mA
Resistance (formatted)240.0 Ω
Power (W)60
Voltage (V)120
Current (A)0.5

Power: 60.00 W

  • 120.0 V driving 500.0 mA delivers 60.00 W.
  • The load resistance is 240.0 Ω.

Next stepFor AC circuits with unknown power factor, measure with a clamp power meter or use a monitoring plug to get real-world readings.

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