Joule per Kilogram (J/kg)
The joule per kilogram is the SI unit of specific energy: enthalpy, latent heat and heating value per unit mass. It is dimensionally m²/s², the same as a velocity squared.
Symbol: J/kg
Quantity: specific energy: enthalpy, latent heat and heating value per mass
SI relation: J/kg is the coherent SI unit of specific energy.
Derivation: Energy per unit mass: J/kg (also m²/s²).
Exact: yes, by definition
Typical uses
- Specific enthalpy h and internal energy u
- Latent heat and heating values
- Gravitational and kinetic energy per mass
Convert joules per kilogram to other units
| Conversion | 1 J/kg equals | Reverse |
|---|---|---|
| joule per kilogram to kilojoule per kilogram | 0.001 kJ/kg | kilojoule per kilogram to joule per kilogram |
| joule per kilogram to megajoule per kilogram | 0.000001 MJ/kg | megajoule per kilogram to joule per kilogram |
| joule per kilogram to BTU per pound | 0.0004299226139 BTU/lb | BTU per pound to joule per kilogram |
| joule per kilogram to kilocalorie per kilogram | 0.0002388458966 kcal/kg | kilocalorie per kilogram to joule per kilogram |
| joule per kilogram to calorie per gram | 0.0002388458966 cal/g | calorie per gram to joule per kilogram |
| joule per kilogram to kilowatt-hour per kilogram | 2.777777778 × 10⁻⁷ kWh/kg | kilowatt-hour per kilogram to joule per kilogram |
| joule per kilogram to joule per gram | 0.001 J/g | joule per gram to joule 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). Joule per Kilogram (J/kg). Retrieved October 29, 2026, from https://scientificconverters.com/units/joule-per-kilogram/
IEEE
Scientific Converters, "Joule per Kilogram (J/kg)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/units/joule-per-kilogram/