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Watts to kWh Calculator

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:

Enter power in watts: W
Enter time in hours: hr
Energy result in kilowatt-hours: kWh


Watts to kWh calculation

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