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Energy Converter

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... Watt-hour = ... Megajoule

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Watt-hour to Megajoule Converter

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

Conversion formula

1 Wh = 0.0036 MJ

1 MJ = 277.777777777778 Wh

Example: 120 Wh = 0.432 MJ

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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.

Megajoule

A megajoule equals one million joules.

History: It follows the SI mega prefix for scaling joules by powers of ten.

Current use: Megajoules are used in fuel values, engineering, and energy reporting.

Also written as MJ, megajoules.

Watt-hour to Megajoule table

Watt-hour [Wh]Megajoule [MJ]
0.01 Wh0.000036 MJ
0.1 Wh0.00036 MJ
1 Wh0.0036 MJ
2 Wh0.0072 MJ
5 Wh0.018 MJ
10 Wh0.036 MJ
20 Wh0.072 MJ
50 Wh0.18 MJ
100 Wh0.36 MJ

Frequently asked questions

  • How many Megajoule (MJ) are in one Watt-hour (Wh)?

    One Watt-hour equals 0.0036 Megajoule.

  • How do you convert Watt-hour to Megajoule?

    Multiply the Watt-hour value by 0.0036 to get the result in Megajoule.

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

    Multiply the Megajoule value by 277.777777777778 to get back to Watt-hour.

  • What is 120 Watt-hour in Megajoule?

    120 Watt-hour equals 0.432 Megajoule.