Power in watts (W) to energy in kilowatt-hours (kWh) calculator and calculation formula.

Enter the power in watts, consumption time period in hours and press the *Calculate *button:

The energy E in kilowatt-hours (kWh) is equal to the power P in watts (W),

times the time period t in hours (hr) divided by 1000:

*E*_{(kWh)} = *P*_{(W)}* *×* t*_{(hr)} / 1000

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