Convert joules to Wh

Joules to watt hours. Enter a value to convert, or use the joules to Wh chart further down the page.

1 J = 0.0002777777778 Wh

1 joule equals 0.0002777777778 watt hours. Going the other way, 1 watt hour = 3,600 joules.

How to convert joules to Wh

To convert joules to watt hours, multiply the joule value by 0.0002777777778. You can also divide by 3600 to get the same answer.

Wh = J × 0.0002777777778

Convert 15 J to watt hours:

15 J = 0.004166666667 Wh

Use this joules to Wh table for quick reference without typing anything.

The joule is the SI unit of energy: the work done by a force of one newton acting over one meter.

A watt hour is exactly 3,600 joules — the energy used by a one-watt device in one hour. Battery capacity is rated in watt hours.

How many Wh are in a joule?

1 joules equals 0.0002777777778 Wh. Going the other way, 1 Wh is 3,600 joules.

How do you convert joules to Wh?

To convert joules to watt hours, multiply the joule value by 0.0002777777778. You can also divide by 3600 to get the same answer.

What is 10 joules in Wh?

10 joules equals 0.002777777778 Wh. The conversion chart on this page lists the other values people look up most often.