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DC power and energy tool

DC Power and Energy Calculator

Calculate electrical power from voltage, current, or resistance, then add runtime to see how much energy the circuit uses.

Did you know? Power describes how quickly energy is transferred. One watt means one joule of energy is transferred every second.

Choose known values

Select a formula, enter both active values, and optionally add runtime.

P = V x I
Enter both active electrical values.

Power flow and energy

Flow intensity responds to power; the energy bar responds to power over time.

Live
DC SOURCEBattery POWER LOAD— W ENERGY USEDAdd runtime
Power— W
Derived Resistance—
Energy— Wh
Energy— kWh
Energy— J

How the result is calculated

Enter both active electrical values to calculate power.

P = V x I
1Choose a power formula.
2Enter the two active electrical values.
3Optionally add runtime to calculate energy.
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