# 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

 Value Symbol Name 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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