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Energy Converter

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... Watt-hour = ... Joule

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Watt-hour to Joule Converter

Use this page to convert watt-hour values into joule, with background details, formulas, a worked example, and a quick conversion table.

Conversion formula

1 Wh = 3,600 J

1 J = 0.000277777777777778 Wh

Example: 120 Wh = 432,000 J

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Watt-hour

A watt-hour is the energy used by one watt over one hour.

History: It became practical with electrical metering and battery capacity descriptions.

Current use: Watt-hours are used for batteries, devices, solar systems, and electricity use.

Also written as Wh, watt hour, watt hours, watt-hours.

Joule

A joule is the work done by a force of one newton through one meter.

History: It is named after James Prescott Joule.

Current use: Joules are used in physics, engineering, and energy calculations.

Also written as J, joules.

Watt-hour to Joule table

Watt-hour [Wh]Joule [J]
0.01 Wh36 J
0.1 Wh360 J
1 Wh3,600 J
2 Wh7,200 J
5 Wh18,000 J
10 Wh36,000 J
20 Wh72,000 J
50 Wh180,000 J
100 Wh360,000 J

Frequently asked questions

  • How many Joule (J) are in one Watt-hour (Wh)?

    One Watt-hour equals 3,600 Joule.

  • How do you convert Watt-hour to Joule?

    Multiply the Watt-hour value by 3,600 to get the result in Joule.

  • How do you convert Joule back to Watt-hour?

    Multiply the Joule value by 0.000277777777777778 to get back to Watt-hour.

  • What is 120 Watt-hour in Joule?

    120 Watt-hour equals 432,000 Joule.