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The result is updated directly from the data entered.
Online Calculator
Electric power calculator
Enter voltage and current to obtain the electrical power in watts and kilowatts.
Power
1,150 W
Power
1.15 kW
Basic formula for direct current or an ideal resistive load: P = V × I.
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The calculations are done in your browser without sending the values to a server.
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Frequently asked questions
What is the electrical power formula?
In the basic case P = V × I.
What units does it use?
Volts for voltage, amps for current, and watts for power.
Is it for alternate current?
The simple formula applies to direct current or ideal resistive loads. In real AC circuits, power factor and phase may also matter.
Does it display kilowatts?
Yes.