Convert megajoule to watt-hour
1 MJ = 277.7777778 Wh
1 MJ = 277.78 Wh
1 MJ in every energy unit
| electron volt | 6.2415e+24 eV |
| hartree | 2.2937e+23 Eh |
| kiloelectron volt | 6.2415e+21 keV |
| megaelectron volt | 6.2415e+18 MeV |
| gigaelectron volt | 6.2415e+15 GeV |
| nanojoule | 1.0000e+15 nJ |
| erg | 10,000,000,000,000 erg |
| teraelectron volt | 6,241,500,000,000 TeV |
| microjoule | 1,000,000,000,000 µJ |
| millijoule | 1,000,000,000 mJ |
| inch-pound | 8,850,700 in·lb |
| joule | 1,000,000 J |
| foot-pound | 737,560 ft⋅lb |
| calorie | 239,010 cal |
| calorie (International Table) | 238,850 cal IT |
| kilojoule | 1,000 kJ |
| BTU (thermochemical) | 948.45 BTU th |
| British thermal unit | 947.82 BTU |
| watt-hour | 277.78 Wh |
| kilocalorie | 239.01 kcal |
| megajoule | 1 MJ |
| horsepower-hour | 0.37251 hp·h |
| kilowatt-hour | 0.27778 kWh |
| therm | 0.0094782 therm |
| gigajoule | 0.001 GJ |
| million BTU | 0.00094782 MMBTU |
| megawatt-hour | 0.00027778 MWh |
| ton of TNT | 0.00023901 t TNT |
| tonne of oil equivalent | 0.000023885 toe |
| terajoule | 0.000001 TJ |
| gigawatt-hour | 2.7778e-07 GWh |
| kiloton of TNT | 2.3901e-07 kt TNT |
| petajoule | 1.0000e-09 PJ |
| terawatt-hour | 2.7778e-10 TWh |
| megaton of TNT | 2.3901e-10 Mt TNT |
| quad | 9.4782e-13 quad |
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 |