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)

So

watt-hour = watts × hours

or

Wh = W × h

Example

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


Watt-hour multiples

ValueSymbolName
10−6
µW⋅h
microwatt-hour
10−3
mW⋅h
milliwatt-hour
103
kW⋅h
kilowatt-hour
106
MW⋅h
megawatt-hour
109
GW⋅h
gigawatt-hour
1012
TW⋅h
terawatt-hour
1015
PW⋅h
petawatt-hour


How to convert Wh to watts »


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