Megajoules to Kilowatt Hours
A megajoule is one million joules, used to measure the energy content of fuels and large-scale energy use. A kilowatt-hour is 1,000 watt-hours, the unit electricity companies use to bill household power usage. 1 MJ equals ≈0.277778 kWh, so converting between them is a matter of multiplying by that fixed factor — type any value into the converter below and both sides update instantly as you type.
Both units belong to energy, measured here against energy's base unit (J) — every other energy unit on this site converts through that same reference point, which is why the table below can also be read as a quick cross-check against nearby values.
Formula
kWh = MJ × ≈0.277778
MJ = kWh × 3.6
Worked example: 5 MJ × ≈0.277778 = ≈1.38889 kWh.
Conversion table
| Megajoule (MJ) | Kilowatt-hour (kWh) |
|---|---|
| 1 MJ | ≈0.277778 kWh |
| 2 MJ | ≈0.555556 kWh |
| 3 MJ | ≈0.833333 kWh |
| 5 MJ | ≈1.38889 kWh |
| 10 MJ | ≈2.77778 kWh |
| 20 MJ | ≈5.55556 kWh |
| 25 MJ | ≈6.94444 kWh |
| 50 MJ | ≈13.8889 kWh |
| 100 MJ | ≈27.7778 kWh |
| 250 MJ | ≈69.4444 kWh |
| 500 MJ | ≈138.889 kWh |
| 1,000 MJ | ≈277.778 kWh |
Frequently asked
- How many Kilowatt-hours in a megajoule?
- 1 MJ equals ≈0.277778 kWh.
- How do I convert Megajoules to Kilowatt-hours?
- Multiply the value in MJ by ≈0.277778 to get kWh. The converter above does this instantly as you type.
- Is the conversion exact?
- Yes — Megajoule and Kilowatt-hour are both defined by a fixed conversion factor to energy's base unit (J), so the result shown is exact to the precision displayed, not an approximation.