Convert Calories per Gram to Joules per Gram (cal/g to J/g)
1 calorie per gram (cal/g) = 4.1868 joules per gram (J/g). 1 J/g = 0.2388458966 cal/g. Example: 15 cal/g = 15 × 4.1868 = 62.802 J/g.
Also searched as calories per gram to J/g, calories per gram in J/g, calories per gram into joules per gram, cal/g to J/g, cal/g in joules per gram, cal/g into joule per gram, calorie per gram to joule per gram, cal/g to joules per gram converter and how many joules per gram in a calorie per gram.
1 cal/g = 4.1868 J/g
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk calorie per gram to joule per gram converter to paste a column from Excel.
How to Convert Calorie per Gram to Joule per Gram
- 1 cal/g = 4.1868 J/g
- 1 J/g = 0.2388458966 cal/g
- Example: convert 15 cal/g to J/g: 15 cal/g = 15 × 4.1868 J/g = 62.802 J/g
Reference conditions. cal/g: International Table calorie (4.1868 J).
Formula
J/g = cal/g × 4.1868
Derivation from SI units:
- 1 cal_IT/g = 4186.8 J/kg = 1 kcal/kg.
- 1 J/g = 1 kJ/kg.
- 1 cal/g = 4186.8 J/kg ÷ 1000 J/kg per J/g = 4.1868 J/g
Both units are defined exactly, so the factor is exact. Calorie per Gram definition: calorie per gram; Joule per Gram definition: joule per gram.
Worked examples
- A reading of 80 cal/g converts to 334.944 J/g.
80 cal/g × 4.1868 = 334.944 J/g - A value of 1000 cal/g is 4186.8 J/g.
1000 cal/g × 4.1868 = 4186.8 J/g
Calorie per Gram to Joule per Gram conversion table
| Calories per Gram (cal/g) | Joules per Gram (J/g) |
|---|---|
| 1 cal/g | 4.1868 J/g |
| 10 cal/g | 41.868 J/g |
| 50 cal/g | 209.34 J/g |
| 80 cal/g | 334.944 J/g |
| 100 cal/g | 418.68 J/g |
| 540 cal/g | 2260.872 J/g |
| 1000 cal/g | 4186.8 J/g |
| 4000 cal/g | 16747.2 J/g |
| 9000 cal/g | 37681.2 J/g |
| 11000 cal/g | 46054.8 J/g |
Where it's used
Calories per Gram are used for latent heat problems in CGS units, while joules per gram appear in DSC melting and crystallisation enthalpy. Both measure specific energy: enthalpy, latent heat and heating value per mass, so the conversion is a fixed factor.
Calorie per Gram to other specific energy units
| Conversion | 1 cal/g equals |
|---|---|
| calorie per gram to joule per gram | 4.1868 J/g |
| calorie per gram to kilojoule per kilogram | 4.1868 kJ/kg |
| calorie per gram to megajoule per kilogram | 0.0041868 MJ/kg |
| calorie per gram to BTU per pound | 1.8 BTU/lb |
| calorie per gram to kilocalorie per kilogram | 1 kcal/kg |
| calorie per gram to joule per kilogram | 4186.8 J/kg |
| calorie per gram to kilowatt-hour per kilogram | 0.001163 kWh/kg |
Frequently asked questions
How many joules per gram are in 1 calorie per gram?
1 cal/g = 4.1868 J/g.
How do I convert calories per gram to joules per gram?
Multiply the value in cal/g by 4.1868. For example, 15 cal/g × 4.1868 = 62.802 J/g.
Is the cal/g to J/g conversion exact?
Yes. Both units are defined exactly, and 1 cal/g is exactly 4.1868 J/g.
Sources
- 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".
- 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). Convert Calories per Gram to Joules per Gram (cal/g to J/g). Retrieved October 29, 2026, from https://scientificconverters.com/specific-energy/calories-per-gram-to-joules-per-gram/
IEEE
Scientific Converters, "Convert Calories per Gram to Joules per Gram (cal/g to J/g)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/specific-energy/calories-per-gram-to-joules-per-gram/