Megajoules to Watt-hours Converter
Convert MJ to Wh instantly — and see every other energy unit at once.
1 MJ=277.7778 Wh
1 MJ in every unit
Joules
1,000,000J
Kilojoules
1,000kJ
Megajoulesfrom
1MJ
Watt-hours
277.7778Wh
Kilowatt-hours
0.277778kWh
Calories (small)
239,005.74cal
Kilocalories (kcal)
239.0057kcal
BTU
947.8134BTU
Electronvolts
6,241,509,074,460,763,000,000,000eV
Foot-pounds
737,561.03ft·lb
Common Megajoules to Watt-hours conversions
| Megajoules (MJ) | Watt-hours (Wh) |
|---|---|
| 1 MJ | 277.77778 Wh |
| 2 MJ | 555.55556 Wh |
| 5 MJ | 1388.88889 Wh |
| 10 MJ | 2777.77778 Wh |
| 25 MJ | 6944.44444 Wh |
| 50 MJ | 13888.88889 Wh |
| 100 MJ | 27777.77778 Wh |
| 250 MJ | 69444.44444 Wh |
| 500 MJ | 138888.88889 Wh |
| 1000 MJ | 277777.77778 Wh |
The formula
Megajoules (MJ) — a unit of energy.
Watt-hours (Wh) — a unit of energy.
Worked examples
1 MJ→277.77778 Wh
Apply Megajoules × 277.778 with input = 1. Result: 277.77778 Wh.
5 MJ→1388.88889 Wh
Apply Megajoules × 277.778 with input = 5. Result: 1388.88889 Wh.
10 MJ→2777.77778 Wh
Apply Megajoules × 277.778 with input = 10. Result: 2777.77778 Wh.
FAQ
How do I convert Megajoules to Watt-hours?
Use the formula: Wh = Megajoules × 277.778. You can also use the converter above — type any value and the result updates instantly.
Where are Megajoules used?
Megajoules (MJ) — a unit of energy.
Where are Watt-hours used?
Watt-hours (Wh) — a unit of energy.
How do I convert Watt-hours back to Megajoules?
Use the Watt-hours to Megajoules converter.