Convert Watt-hour to Megajoule
1 watt-hour = 0.0036 megajoule (MJ). For example, 10 watt-hour = 0.036 megajoule and 100 watt-hour = 0.36 megajoule. Type any value below to convert watt-hour to megajoule both ways — it runs entirely in your browser.
Watt-hour to Megajoule conversion formula
To convert watt-hour to megajoule, multiply by 0.0036:
megajoule = watt-hour × 0.0036
Going the other way, 1 megajoule = 277.7778 watt-hour, so
watt-hour = megajoule × 277.7778.
Watt-hour to Megajoule — worked examples
| Watt-hour | Megajoule |
|---|---|
| 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 |
| 25 Wh | 0.09 MJ |
| 50 Wh | 0.18 MJ |
| 100 Wh | 0.36 MJ |
Watt-hour ↔ Megajoule reference table
| Watt-hour → Megajoule | Megajoule → Watt-hour |
|---|---|
| 1 Wh = 0.0036 MJ | 1 MJ = 277.7778 Wh |
| 2 Wh = 0.0072 MJ | 2 MJ = 555.5556 Wh |
| 5 Wh = 0.018 MJ | 5 MJ = 1,388.889 Wh |
| 10 Wh = 0.036 MJ | 10 MJ = 2,777.778 Wh |
| 20 Wh = 0.072 MJ | 20 MJ = 5,555.556 Wh |
| 50 Wh = 0.18 MJ | 50 MJ = 13,888.89 Wh |
| 100 Wh = 0.36 MJ | 100 MJ = 27,777.78 Wh |
| 250 Wh = 0.9 MJ | 250 MJ = 69,444.44 Wh |
| 500 Wh = 1.8 MJ | 500 MJ = 138,888.9 Wh |
| 1000 Wh = 3.6 MJ | 1000 MJ = 277,777.8 Wh |
About watt-hour and megajoule
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.
Megajoule: A megajoule is 1,000,000 joules (1,000 kJ) — used for larger energy quantities such as the energy content of fuels.
Frequently asked questions
- How many megajoule are in 1 watt-hour?
- 1 watt-hour = 0.0036 megajoule (MJ).
- How do I convert watt-hour to megajoule?
- Multiply the number of watt-hour by 0.0036. For example, 10 watt-hour = 10 × 0.0036 = 0.036 megajoule.
- How many watt-hour are in 1 megajoule?
- 1 megajoule = 277.7778 watt-hour.
- Which is bigger, watt-hour or megajoule?
- 1 megajoule equals 277.7778 watt-hour, so a megajoule is the larger unit.