Convert Megajoule to Watt-hour
1 megajoule = 277.7778 watt-hour (Wh). For example, 10 megajoule = 2,777.778 watt-hour and 100 megajoule = 27,777.78 watt-hour. Type any value below to convert megajoule to watt-hour both ways — it runs entirely in your browser.
Megajoule to Watt-hour conversion formula
To convert megajoule to watt-hour, multiply by 277.7778:
watt-hour = megajoule × 277.7778
Going the other way, 1 watt-hour = 0.0036 megajoule, so
megajoule = watt-hour × 0.0036.
Megajoule to Watt-hour — worked examples
| Megajoule | Watt-hour |
|---|---|
| 1 MJ | 277.7778 Wh |
| 2 MJ | 555.5556 Wh |
| 3 MJ | 833.3333 Wh |
| 5 MJ | 1,388.889 Wh |
| 10 MJ | 2,777.778 Wh |
| 25 MJ | 6,944.444 Wh |
| 50 MJ | 13,888.89 Wh |
| 100 MJ | 27,777.78 Wh |
Megajoule ↔ Watt-hour reference table
| Megajoule → Watt-hour | Watt-hour → Megajoule |
|---|---|
| 1 MJ = 277.7778 Wh | 1 Wh = 0.0036 MJ |
| 2 MJ = 555.5556 Wh | 2 Wh = 0.0072 MJ |
| 5 MJ = 1,388.889 Wh | 5 Wh = 0.018 MJ |
| 10 MJ = 2,777.778 Wh | 10 Wh = 0.036 MJ |
| 20 MJ = 5,555.556 Wh | 20 Wh = 0.072 MJ |
| 50 MJ = 13,888.89 Wh | 50 Wh = 0.18 MJ |
| 100 MJ = 27,777.78 Wh | 100 Wh = 0.36 MJ |
| 250 MJ = 69,444.44 Wh | 250 Wh = 0.9 MJ |
| 500 MJ = 138,888.9 Wh | 500 Wh = 1.8 MJ |
| 1000 MJ = 277,777.8 Wh | 1000 Wh = 3.6 MJ |
About megajoule and watt-hour
Megajoule: A megajoule is 1,000,000 joules (1,000 kJ) — used for larger energy quantities such as the energy content of fuels.
Watt-hour: A watt-hour is the energy of one watt sustained for one hour — exactly 3,600 joules. Commonly used to rate battery capacity.
Frequently asked questions
- How many watt-hour are in 1 megajoule?
- 1 megajoule = 277.7778 watt-hour (Wh).
- How do I convert megajoule to watt-hour?
- Multiply the number of megajoule by 277.7778. For example, 10 megajoule = 10 × 277.7778 = 2,777.778 watt-hour.
- How many megajoule are in 1 watt-hour?
- 1 watt-hour = 0.0036 megajoule.
- Which is bigger, megajoule or watt-hour?
- 1 megajoule equals 277.7778 watt-hour, so a megajoule is the larger unit.