Joules to Watts Electrical Conversion Calculator

Convert joules to watts by entering the energy and time in seconds below.

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How to Convert Joules to Watts

A watt (W) is a measure of power in an electrical circuit.

A joule (J) is the measure energy, specifically it’s the amount of energy dissipated to move a 1 kilogram object 1 meter using 1 newton of force.

If you know the amount of time in seconds the energy has been dissipated over you can use this formula to convert joules to watts:

Power(W) = Energy(J) ÷ Time(s)

Substitute joules and time in seconds in the formula above to determine watts.

Power is equal to the energy in joules divided by the time in seconds.

For example, find watts of power for 250 joules of energy over 40 seconds.

watts = joules ÷ seconds
watts = 250 ÷ 40
watts = 6.25

You might also like our watts to amps converter for converting power to current.