Watt-hours to Megajoules
Convert watt-hours to megajoules instantly. 1 Wh = 0.0036 MJ. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert watt-hours to megajoules
To convert watt-hours to megajoules, divide by 277.7777777778 (multiply by 0.0036). The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
MJ = Wh × 0.0036
Watt-hours to Megajoules conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Watt-hours | Megajoules |
|---|---|
| 1 Wh | 0.0036 MJ |
| 2 Wh | 0.0072 MJ |
| 3 Wh | 0.0108 MJ |
| 5 Wh | 0.018 MJ |
| 10 Wh | 0.036 MJ |
| 20 Wh | 0.072 MJ |
| 25 Wh | 0.09 MJ |
| 50 Wh | 0.18 MJ |
| 100 Wh | 0.36 MJ |
| 500 Wh | 1.8 MJ |
| 1,000 Wh | 3.6 MJ |
What is a watt-hour?
One watt sustained for one hour. Battery capacity is quoted this way.
What is a megajoule?
A million joules, used for fuel energy content and gas billing.
The formula
MJ = Wh × 0.0036
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the Watt-hours to Megajoules
- Type the number of watt-hours you want to convert.
- Read the result in megajoules straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked megajoules to watt-hours page.
Watt-hours to Megajoules — frequently asked questions
How many megajoules are in a watt-hour?
One watt-hour equals 0.0036 MJ. MJ = Wh × 0.0036
What is the formula to convert watt-hours to megajoules?
The formula is MJ = Wh × 0.0036. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert megajoules back to watt-hours?
Divide instead of multiplying: one megajoule is 277.7777777778 Wh. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this watt-hours to megajoules free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
What people search for
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 19, 2026 · Calculation runs client-side · No data collected · Report an error