Convert Joules to Watt Hours

Q: How many watt hours are in a joule?

There are 0.0002777778 watt hours in one joule.

Q: How many joules are in a watt hour?

There are 3,600 joules in one watt hour.

1 joule = 0.0002777778 watt hours. Type any value below to convert in either direction — the calculation happens in your browser.

joules

watt hours

Joules to Watt Hours formula

Multiply the number of joules by 0.0002777778 to get watt hours.

watt hours = joules × 0.0002777778

To go the other way: divide the number of watt hours by 0.0002777778, or multiply by 3600.

joules = watt hours ÷ 0.0002777778

Joules to Watt Hours conversion table

Joules	Watt Hours
1 J	0.0002777778 Wh
2 J	0.0005555556 Wh
3 J	0.0008333333 Wh
4 J	0.001111111 Wh
5 J	0.001388889 Wh
6 J	0.001666667 Wh
7 J	0.001944444 Wh
8 J	0.002222222 Wh
9 J	0.0025 Wh
10 J	0.002777778 Wh
15 J	0.004166667 Wh
20 J	0.005555556 Wh
25 J	0.006944444 Wh
30 J	0.008333333 Wh
40 J	0.01111111 Wh
50 J	0.01388889 Wh
75 J	0.02083333 Wh
100 J	0.02777778 Wh
250 J	0.06944444 Wh
500 J	0.1388889 Wh
1,000 J	0.2777778 Wh

Watt Hours to Joules conversion table

Watt Hours	Joules
1 Wh	3,600 J
2 Wh	7,200 J
3 Wh	10,800 J
4 Wh	14,400 J
5 Wh	18,000 J
6 Wh	21,600 J
7 Wh	25,200 J
8 Wh	28,800 J
9 Wh	32,400 J
10 Wh	36,000 J

About the joule

The joule is the SI unit of energy — the work done by one newton acting over one metre.

About the watt hour

A watt hour is the energy of one watt sustained for one hour, equal to 3,600 joules.

Frequently asked questions

How many watt hours are in a joule?

There are 0.0002777778 watt hours in one joule.

How many joules are in a watt hour?

There are 3,600 joules in one watt hour.

Is this conversion exact?

The ratio between the joule and the watt hour is fixed by definition, so the conversion is exact — the figures shown here are rounded for readability only.

What is 10 joules in watt hours?

10 joules equals 0.002777778 watt hours.

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