Joules per Kilogram to Calories per Gram (J/kg to cal/g)
1 joule per kilogram (J/kg) = 0.0002388458966 calories per gram (cal/g). 1 cal/g = 4186.8 J/kg. Example: 15 J/kg = 15 × 0.0002388458966 = 0.003582688449 cal/g.
Also searched as joules per kilogram to cal/g, joules per kilogram in cal/g, joules per kilogram into calories per gram, J/kg to cal/g, J/kg in calories per gram, J/kg into calorie per gram, joule per kilogram to calorie per gram, J/kg to calories per gram converter and how many calories per gram in a joule per kilogram.
1 J/kg = 0.0002388458966 cal/g
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk joule per kilogram to calorie per gram converter to paste a column from Excel.
How to Convert Joule per Kilogram to Calorie per Gram
- 1 J/kg = 0.0002388458966 cal/g
- 1 cal/g = 4186.8 J/kg
- Example: convert 15 J/kg to cal/g: 15 J/kg = 15 × 0.0002388458966 cal/g = 0.003582688449 cal/g
Reference conditions. cal/g: International Table calorie (4.1868 J).
Formula
cal/g = J/kg × 0.0002388458966275
or cal/g = J/kg ÷ 4186.8
Derivation from SI units:
- Energy per unit mass: J/kg (also m²/s²).
- 1 cal_IT/g = 4186.8 J/kg = 1 kcal/kg.
Both units are defined exactly, so the factor is exact. Joule per Kilogram definition: joule per kilogram; Calorie per Gram definition: calorie per gram.
Worked examples
- A reading of 334000 J/kg converts to 79.77452947 cal/g.
334000 J/kg × 0.0002388458966 = 79.77452947 cal/g - A value of 2500000 J/kg is 597.1147416 cal/g.
2500000 J/kg × 0.0002388458966 = 597.1147416 cal/g
Joule per Kilogram to Calorie per Gram conversion table
| Joules per Kilogram (J/kg) | Calories per Gram (cal/g) |
|---|---|
| 1000 J/kg | 0.2388458966 cal/g |
| 10000 J/kg | 2.388458966 cal/g |
| 100000 J/kg | 23.88458966 cal/g |
| 334000 J/kg | 79.77452947 cal/g |
| 1000000 J/kg | 238.8458966 cal/g |
| 2257000 J/kg | 539.0751887 cal/g |
| 2500000 J/kg | 597.1147416 cal/g |
| 10000000 J/kg | 2388.458966 cal/g |
| 42000000 J/kg | 10031.52766 cal/g |
| 50000000 J/kg | 11942.29483 cal/g |
Where it's used
Joules per Kilogram are used for specific enthalpy h and internal energy u, while calories per gram appear in latent heat problems in CGS units. Both measure specific energy: enthalpy, latent heat and heating value per mass, so the conversion is a fixed factor.
Joule per Kilogram to other specific energy units
| Conversion | 1 J/kg equals |
|---|---|
| joule per kilogram to calorie per gram | 0.0002388458966 cal/g |
| joule per kilogram to kilojoule per kilogram | 0.001 kJ/kg |
| joule per kilogram to megajoule per kilogram | 0.000001 MJ/kg |
| joule per kilogram to BTU per pound | 0.0004299226139 BTU/lb |
| joule per kilogram to kilocalorie per kilogram | 0.0002388458966 kcal/kg |
| joule per kilogram to kilowatt-hour per kilogram | 2.777777778 × 10⁻⁷ kWh/kg |
| joule per kilogram to joule per gram | 0.001 J/g |
Frequently asked questions
How many calories per gram are in 1 joule per kilogram?
1 J/kg = 0.0002388458966 cal/g.
How do I convert joules per kilogram to calories per gram?
Multiply the value in J/kg by 0.0002388458966, or divide it by 4186.8. For example, 15 J/kg × 0.0002388458966 = 0.003582688449 cal/g.
Is the J/kg to cal/g conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4 (derived units with special names).
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "calorie_IT per gram".
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). Joules per Kilogram to Calories per Gram (J/kg to cal/g). Retrieved October 29, 2026, from https://scientificconverters.com/specific-energy/joules-per-kilogram-to-calories-per-gram/
IEEE
Scientific Converters, "Joules per Kilogram to Calories per Gram (J/kg to cal/g)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/specific-energy/joules-per-kilogram-to-calories-per-gram/