Watts to kWh calculator

Enter the power in watts (W), time period in hours (h), then press the Calculate button to get the result in kilowatt-hours (kWh).

Watts to kWh calculation

kWh: 0

E(kWh) = P(W) × t(h) / 1000

The energy E in kilowatt-hours (kWh) is equal to the power P in watts (W), multiplied by the time period t in hours (h), divided by 1000.