How to convert watts to watt-hours

How to convert electric power in watts (W) to energy in watt-hour (Wh).

You can calculate watt-hour from watts and hours, but you can't convert watts to watt-hour, since watts and watt-hour units represent different quantities.

Watts to watt-hour calculation formula

The energy E in watt-hour (Wh) is equal to the power P in watts (W), times the time period t in hours (h):

E(Wh) = P(W) × t(h)


watt-hour = watts × hours


Wh = W × h


What is the energy consumption in watt-hour when the power consumption is 5 watts for time duration of 3 hours?

E = 5W × 3h = 15 Wh


How to convert Wh to watts ►


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