megajoule per kilogram
One megajoule per kilogram — the unit fuels are compared in. Diesel is about 45.6 MJ/kg, petrol about 46.4, wood around 16, and hydrogen about 142, which is the highest of any chemical fuel by weight.
Watch out: Specific energy by WEIGHT and by VOLUME rank fuels very differently, and hydrogen is the extreme case: the best in the world per kilogram, and poor per litre unless it is compressed hard or liquefied. A fuel comparison that quotes only one of the two is telling half the story.
| 1 (Specific energy) | 1,000,000 |
| 1 (Specific latent heat) | 1,000,000 |
As a unit of specific latent heat
The megajoule per kilogram is 10⁶ J/kg exactly, the unit of fuel energy content. Diesel is about 45.6 MJ/kg, natural gas 53, hydrogen 120, and a lithium-ion cell around 0.9.
One megajoule per kilogram in every specific energy unit
| 1,000,000 | joule per kilogram (J/kg) | |
| 1,000 | kilojoule per kilogram (kJ/kg) | |
| 1 | megajoule per kilogram (MJ/kg)this unit | |
| 277.778 | watt-hour per kilogram (Wh/kg) | |
| 0.277778 | kilowatt-hour per kilogram (kWh/kg) | |
| 277.778 | kilowatt-hour per tonne (kWh/t) | |
| 429.923 | BTU per pound (BTU/lb) | |
| 251.996 | kilowatt-hour per short ton (kWh/ton) |
One megajoule per kilogram in every specific latent heat unit
| 1,000,000 | joule per kilogram (J/kg) | |
| 334,553 | foot pound-force per pound (ft·lbf/lb) | |
| 1,000 | kilojoule per kilogram (kJ/kg) | |
| 1,000 | joule per gram (J/g) | |
| 429.923 | BTU per pound (BTU/lb) | |
| 277.778 | watt-hour per kilogram (W·h/kg) | |
| 239.006 | calorie per gram (cal/g) | |
| 239.006 | kilocalorie per kilogram (kcal/kg) | |
| 1 | megajoule per kilogram (MJ/kg)this unit | |
| 0.277778 | kilowatt-hour per kilogram (kW·h/kg) |
Solvers that use specific energy