Convert kilojoule per kilogram to joule per kilogram instantly. Type in either field — results update live.
Selected kJ/kg values converted to J/kg using the exact factor from this tool.
| kJ/kg | J/kg |
|---|---|
| 0.01 | 10 |
| 0.1 | 100 |
| 1 | 1,000 |
| 2 | 2,000 |
| 3 | 3,000 |
| 5 | 5,000 |
| 10 | 10,000 |
| 20 | 20,000 |
| 50 | 50,000 |
| 100 | 100,000 |
| 1,000 | 1,000,000 |
Exact conversion factors in both directions, plus a worked example.
1 kJ/kg = 1000 J/kg
1 J/kg = 0.001 kJ/kg
To convert kilojoule per kilogram to joule per kilogram, multiply by 1000.
To convert joule per kilogram to kilojoule per kilogram, multiply by 0.001.
Example: convert 10 kJ/kg to J/kg
10 × 1000 = 10000 J/kg
Short background on the units used in this conversion.
The joule per kilogram (J/kg) is the SI unit of fuel efficiency on a mass basis — useful energy per unit fuel mass.
Joules per kilogram compare heating values and energy content of fuels, propellants, and biomass on a mass basis.
1 kilojoule per kilogram = 1,000 joules per kilogram1 joule per kilogram = 0.001 kilojoules per kilogram. IT and thermochemical variants are kept separate.Jump to any fuel efficiency-mass conversion starting from kilojoule per kilogram — including the reverse direction and every other unit in our dataset.