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Convert joules to watt-hours

Convert joules (J) to watt-hours (Wh). 1 J = 0.000277778 Wh, and 1 Wh = 3,600 J.

1 J = 0.000277778 Wh

Joules to Wh formula

Wh = J ÷ 3,600

Divide the number of joules by 3,600.

Example: To convert 1 J to watt-hours: 1 ÷ 3,600 = 0.000277778 Wh.

Quick answers

What is 1 J in watt-hours?
1 J = 0.000277778 Wh
What is 1,000 J in watt-hours?
1,000 J = 0.277778 Wh

Joules to Wh conversion table

Wh to Joules table
joules (J)watt-hours (Wh)
1 J0.000277778 Wh
10 J0.00277778 Wh
100 J0.0277778 Wh
1,000 J0.277778 Wh
4,184 J1.16222 Wh
10,000 J2.77778 Wh
100,000 J27.7778 Wh
1,000,000 J277.778 Wh
3,600,000 J1,000 Wh

Frequently asked questions

How many joules are in a watt-hour?

There are 3,600 joules in a watt-hour (1 Wh = 3,600 J), so 1 J = 0.000277778 Wh.

How do I convert joules to watt-hours?

Divide the number of joules by 3,600. To convert 1 J to watt-hours: 1 ÷ 3,600 = 0.000277778 Wh.

Is the Joules to Wh conversion exact?

Yes. Both units are defined exactly, so 1 joule is exactly 0.000277777777778 watt-hours. Results on this page are rounded to six significant digits; pick more decimals in the converter if you need them.

What is 1 J in watt-hours?

1 J = 0.000277778 Wh.

How do I convert watt-hours back to joules?

Use the reverse relationship: 1 Wh = 3,600 J. The Wh to Joules page has a converter and a full table.

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