Convert Joules per Gram to Calories per Gram (J/g to cal/g)
1 joule per gram (J/g) = 0.2388458966 calories per gram (cal/g). 1 cal/g = 4.1868 J/g. Example: 15 J/g = 15 × 0.2388458966 = 3.582688449 cal/g.
Also searched as joules per gram to cal/g, joules per gram in cal/g, joules per gram into calories per gram, J/g to cal/g, J/g in calories per gram, J/g into calorie per gram, joule per gram to calorie per gram, J/g to calories per gram converter and how many calories per gram in a joule per gram.
1 J/g = 0.2388458966 cal/g
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk joule per gram to calorie per gram converter to paste a column from Excel.
How to Convert Joule per Gram to Calorie per Gram
- 1 J/g = 0.2388458966 cal/g
- 1 cal/g = 4.1868 J/g
- Example: convert 15 J/g to cal/g: 15 J/g = 15 × 0.2388458966 cal/g = 3.582688449 cal/g
Reference conditions. cal/g: International Table calorie (4.1868 J).
Formula
cal/g = J/g × 0.2388458966275
or cal/g = J/g ÷ 4.1868
Derivation from SI units:
- 1 J/g = 1 kJ/kg.
- 1 cal_IT/g = 4186.8 J/kg = 1 kcal/kg.
- 1 J/g = 1000 J/kg ÷ 4186.8 J/kg per cal/g = 0.2388458966275 cal/g
Both units are defined exactly, so the factor is exact. Joule per Gram definition: joule per gram; Calorie per Gram definition: calorie per gram.
Worked examples
- A reading of 100 J/g converts to 23.88458966 cal/g.
100 J/g × 0.2388458966 = 23.88458966 cal/g - A value of 1000 J/g is 238.8458966 cal/g.
1000 J/g × 0.2388458966 = 238.8458966 cal/g
Joule per Gram to Calorie per Gram conversion table
| Joules per Gram (J/g) | Calories per Gram (cal/g) |
|---|---|
| 1 J/g | 0.2388458966 cal/g |
| 10 J/g | 2.388458966 cal/g |
| 50 J/g | 11.94229483 cal/g |
| 100 J/g | 23.88458966 cal/g |
| 200 J/g | 47.76917933 cal/g |
| 334 J/g | 79.77452947 cal/g |
| 1000 J/g | 238.8458966 cal/g |
| 2257 J/g | 539.0751887 cal/g |
| 17000 J/g | 4060.380243 cal/g |
| 37000 J/g | 8837.298175 cal/g |
Where it's used
Joules per Gram are used for DSC melting and crystallisation enthalpy, 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 Gram to other specific energy units
| Conversion | 1 J/g equals |
|---|---|
| joule per gram to calorie per gram | 0.2388458966 cal/g |
| joule per gram to kilojoule per kilogram | 1 kJ/kg |
| joule per gram to megajoule per kilogram | 0.001 MJ/kg |
| joule per gram to BTU per pound | 0.4299226139 BTU/lb |
| joule per gram to kilocalorie per kilogram | 0.2388458966 kcal/kg |
| joule per gram to joule per kilogram | 1000 J/kg |
| joule per gram to kilowatt-hour per kilogram | 0.0002777777778 kWh/kg |
Frequently asked questions
How many calories per gram are in 1 joule per gram?
1 J/g = 0.2388458966 cal/g.
How do I convert joules per gram to calories per gram?
Multiply the value in J/g by 0.2388458966, or divide it by 4.1868. For example, 15 J/g × 0.2388458966 = 3.582688449 cal/g.
Is the J/g 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). Convert Joules per Gram to Calories per Gram (J/g to cal/g). Retrieved October 29, 2026, from https://scientificconverters.com/specific-energy/joules-per-gram-to-calories-per-gram/
IEEE
Scientific Converters, "Convert Joules per Gram to Calories per Gram (J/g to cal/g)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/specific-energy/joules-per-gram-to-calories-per-gram/