Kilojoule per Kilogram (kJ/kg)
Kilojoules per kilogram are the unit of steam-table enthalpy and latent heat: the latent heat of vaporisation of water at 100 °C is 2257 kJ/kg and of fusion of ice 334 kJ/kg.
Symbol: kJ/kg
Quantity: specific energy: enthalpy, latent heat and heating value per mass
SI relation: 1 kJ/kg = 1000 J/kg (exact)
Derivation: 1 kJ/kg = 1000 J/kg.
Exact: yes, by definition
Same quantity as joule per gram (J/g) : the factor between them is exactly 1.
Typical uses
- Steam tables (h, u, latent heat)
- Refrigerant enthalpy and COP problems
- Drying and evaporation energy balances
Convert kilojoules per kilogram to other units
| Conversion | 1 kJ/kg equals | Reverse |
|---|---|---|
| kilojoule per kilogram to megajoule per kilogram | 0.001 MJ/kg | megajoule per kilogram to kilojoule per kilogram |
| kilojoule per kilogram to BTU per pound | 0.4299226139 BTU/lb | BTU per pound to kilojoule per kilogram |
| kilojoule per kilogram to kilocalorie per kilogram | 0.2388458966 kcal/kg | kilocalorie per kilogram to kilojoule per kilogram |
| kilojoule per kilogram to joule per kilogram | 1000 J/kg | joule per kilogram to kilojoule per kilogram |
| kilojoule per kilogram to calorie per gram | 0.2388458966 cal/g | calorie per gram to kilojoule per kilogram |
| kilojoule per kilogram to kilowatt-hour per kilogram | 0.0002777777778 kWh/kg | kilowatt-hour per kilogram to kilojoule per kilogram |
| kilojoule per kilogram to joule per gram | 1 J/g | joule per gram to kilojoule per kilogram |
Open the Specific Enthalpy Converter (kJ/kg, BTU/lb, kcal/kg) to convert any value between all units.
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4 (derived units with special names).
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Kilojoule per Kilogram (kJ/kg). Retrieved October 29, 2026, from https://scientificconverters.com/units/kilojoule-per-kilogram/
IEEE
Scientific Converters, "Kilojoule per Kilogram (kJ/kg)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/units/kilojoule-per-kilogram/