Megajoules to Kilowatt-hours
Convert megajoules to kilowatt-hours instantly. 1 MJ = 0.2777777778 kWh. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert megajoules to kilowatt-hours
To convert megajoules to kilowatt-hours, divide by 3.6 (multiply by 0.2777777778). 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.
kWh = MJ × 0.2777777778
Megajoules to Kilowatt-hours conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Megajoules | Kilowatt-hours |
|---|---|
| 1 MJ | 0.277778 kWh |
| 2 MJ | 0.555556 kWh |
| 3 MJ | 0.833333 kWh |
| 5 MJ | 1.388889 kWh |
| 10 MJ | 2.777778 kWh |
| 20 MJ | 5.555556 kWh |
| 25 MJ | 6.944444 kWh |
| 50 MJ | 13.888889 kWh |
| 100 MJ | 27.777778 kWh |
| 500 MJ | 138.888889 kWh |
| 1,000 MJ | 277.777778 kWh |
What is a megajoule?
A million joules, used for fuel energy content and gas billing.
What is a kilowatt-hour?
The unit on every electricity bill: a thousand watts for one hour.
The formula
kWh = MJ × 0.2777777778
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 Megajoules to Kilowatt-hours
- Type the number of megajoules you want to convert.
- Read the result in kilowatt-hours 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 kilowatt-hours to megajoules page.
Megajoules to Kilowatt-hours — frequently asked questions
How many kilowatt-hours are in a megajoule?
One megajoule equals 0.2777777778 kWh. kWh = MJ × 0.2777777778
What is the formula to convert megajoules to kilowatt-hours?
The formula is kWh = MJ × 0.2777777778. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert kilowatt-hours back to megajoules?
Divide instead of multiplying: one kilowatt-hour is 3.6 MJ. 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 megajoules to kilowatt-hours 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