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Megajoules to Kilowatt-hours
Convert megajoules (MJ) to kilowatt-hours (kWh). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 MJ = 0.277778 kWh
Megajoules to Kilowatt-hours Conversion Table
Common values, ready to copy:
| megajoules | kilowatt-hours |
|---|---|
| 1 MJ | 0.277778 kWh |
| 2 MJ | 0.555556 kWh |
| 5 MJ | 1.3889 kWh |
| 10 MJ | 2.7778 kWh |
| 25 MJ | 6.9444 kWh |
| 50 MJ | 13.8889 kWh |
| 100 MJ | 27.7778 kWh |
| 1,000 MJ | 277.78 kWh |
Formula
kilowatt-hours = megajoules × 2.77777778e-1
Energy uses the SI joule. Food calories (kcal) are 1,000 small calories: 1 kcal = 4,184 J. 1 kWh = 3.6 MJ = 3,600,000 J. 1 BTU = 1,055.06 J.
About Megajoules and Kilowatt-hours
Megajoules (MJ): A million joules; the unit for larger-scale energy quantities. Common uses: Daily food intake (a typical adult consumes 8-10 MJ per day), fuel energy content (gasoline ≈ 34 MJ per liter), and industrial energy.
Kilowatt-hours (kWh): A thousand watt-hours, or 3.6 MJ; the standard utility billing unit for residential and commercial electricity. Common uses: Electricity bills, residential and EV battery capacity (a typical EV battery is 50-100 kWh), and home solar generation.
How the conversion works
Energy uses the SI joule. Food calories (kcal) are 1,000 small calories: 1 kcal = 4,184 J. 1 kWh = 3.6 MJ = 3,600,000 J. 1 BTU = 1,055.06 J.
The exact relationship is kilowatt-hours = megajoules × 2.77777778e-1, which the calculator at the top of this page applies in both directions. Type into either field and the other updates immediately.
When this conversion matters
Converting between megajoules and kilowatt-hours comes up wherever energy measurements move between systems — from one country's conventions to another's, from a scientific reference to a practical specification, or from one industry's working unit to another's. The calculator and reference table above cover the everyday range; for unusual values you can type any number into either field.