Watt-Hours to Joules

1 watt-hour = 3,600 joules. To convert watt-hours (Wh) to joules (J), multiply by 3,600.

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How to convert watt-hours to joules

J = Wh × 3,600

Example: convert 8 watt-hours to joules.
8 Wh × 3,600 = 28,800 J

The same relationship in reverse: 1 joule = 0.000277777778 watt-hours, so you can also divide by 0.000277777778. Need the other direction? Use the joules to watt-hours converter.

You will typically need this conversion for battery and power bank capacity.

Watt-Hours to Joules conversion chart

Watt-Hours (Wh)Joules (J)
1 Wh3,600 J
2 Wh7,200 J
3 Wh10,800 J
4 Wh14,400 J
5 Wh18,000 J
6 Wh21,600 J
7 Wh25,200 J
8 Wh28,800 J
9 Wh32,400 J
10 Wh36,000 J
15 Wh54,000 J
20 Wh72,000 J
25 Wh90,000 J
30 Wh108,000 J
40 Wh144,000 J
50 Wh180,000 J
75 Wh270,000 J
100 Wh360,000 J
250 Wh900,000 J
500 Wh1,800,000 J
1,000 Wh3,600,000 J

Values rounded to 8 significant figures. The converter above shows up to 12.

About the units

Watt-Hour (Wh)

One watt for one hour, 3,600 J. Used for battery and power bank capacity.

Joule (J)

The SI unit of energy: the work done by a force of one newton over one meter, or one watt for one second.

Frequently asked questions

How many joules are in a watt-hour?

1 watt-hour = 3,600 joules. Going the other way, 1 joule = 0.000277777778 watt-hours.

How do I convert watt-hours to joules?

To convert watt-hours to joules, multiply by 3,600. The formula is J = Wh × 3,600.

What is 8 Wh in J?

8 watt-hours is 28,800 joules (8 Wh × 3,600 = 28,800 J).

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