Convert megajoule to watt-hour
1 MJ = 277.7777778 Wh
1 MJ = 278 Wh
1 MJ in every energy unit
| joule | 1,000,000 J |
| kilojoule | 1,000 kJ |
| megajoule | 1 MJ |
| calorie | 239,000 cal |
| kilocalorie | 239 kcal |
| watt-hour | 278 Wh |
| kilowatt-hour | 0.278 kWh |
| British thermal unit | 948 BTU |
| foot-pound | 738,000 ft⋅lb |
| electron volt | 6.24e+24 eV |
| kiloelectron volt | 6.24e+21 keV |
| megaelectron volt | 6.24e+18 MeV |
How the conversion works
Multiply by 277.7777778 to go from megajoule to watt-hour, or divide by it to go back. Every conversion on this site routes through the SI value (J) rather than a table of pairwise factors, so a round-trip returns exactly what you started with.
Going the other way? watt-hour to megajoule — 1 Wh = 0.0036 MJ.
megajoule to watt-hour — common values
| 1 MJ | 277.77778 Wh |
| 2 MJ | 555.55556 Wh |
| 3 MJ | 833.33333 Wh |
| 5 MJ | 1,388.8889 Wh |
| 10 MJ | 2,777.7778 Wh |
| 15 MJ | 4,166.6667 Wh |
| 20 MJ | 5,555.5556 Wh |
| 25 MJ | 6,944.4444 Wh |
| 50 MJ | 13,888.889 Wh |
| 75 MJ | 20,833.333 Wh |
| 100 MJ | 27,777.778 Wh |
| 250 MJ | 69,444.444 Wh |
| 500 MJ | 138,888.89 Wh |
| 1000 MJ | 277,777.78 Wh |