Joules to Watt-Hours

1 joule = 0.000277777778 watt-hours. To convert joules (J) to watt-hours (Wh), divide by 3,600.

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How to convert joules to watt-hours

Wh = J ÷ 3,600

Example: convert 8 joules to watt-hours.
8 J ÷ 3,600 = 0.002222222222 Wh

The same relationship in reverse: 1 watt-hour = 3,600 joules, so you can also multiply by 0.000277777778. Need the other direction? Use the watt-hours to joules converter.

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

Joules to Watt-Hours conversion chart

Joules (J)Watt-Hours (Wh)
1 J0.00027777778 Wh
2 J0.00055555556 Wh
3 J0.00083333333 Wh
4 J0.0011111111 Wh
5 J0.0013888889 Wh
6 J0.0016666667 Wh
7 J0.0019444444 Wh
8 J0.0022222222 Wh
9 J0.0025 Wh
10 J0.0027777778 Wh
15 J0.0041666667 Wh
20 J0.0055555556 Wh
25 J0.0069444444 Wh
30 J0.0083333333 Wh
40 J0.011111111 Wh
50 J0.013888889 Wh
75 J0.020833333 Wh
100 J0.027777778 Wh
250 J0.069444444 Wh
500 J0.13888889 Wh
1,000 J0.27777778 Wh

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

About the units

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.

Watt-Hour (Wh)

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

Frequently asked questions

How many watt-hours are in a joule?

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

How do I convert joules to watt-hours?

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

What is 8 J in Wh?

8 joules is 0.002222222222 watt-hours (8 J ÷ 3,600 = 0.002222222222 Wh).

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