Calories per Gram to Joules per Kilogram (cal/g to J/kg)
1 calorie per gram (cal/g) = 4186.8 joules per kilogram (J/kg). 1 J/kg = 0.0002388458966 cal/g. Example: 15 cal/g = 15 × 4186.8 = 62802 J/kg.
Also searched as calories per gram to J/kg, calories per gram in J/kg, calories per gram into joules per kilogram, cal/g to J/kg, cal/g in joules per kilogram, cal/g into joule per kilogram, calorie per gram to joule per kilogram, cal/g to joules per kilogram converter and how many joules per kilogram in a calorie per gram.
1 cal/g = 4186.8 J/kg
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk calorie per gram to joule per kilogram converter to paste a column from Excel.
How to Convert Calorie per Gram to Joule per Kilogram
- 1 cal/g = 4186.8 J/kg
- 1 J/kg = 0.0002388458966 cal/g
- Example: convert 15 cal/g to J/kg: 15 cal/g = 15 × 4186.8 J/kg = 62802 J/kg
Reference conditions. cal/g: International Table calorie (4.1868 J).
Formula
J/kg = cal/g × 4186.8
Derivation from SI units:
- 1 cal_IT/g = 4186.8 J/kg = 1 kcal/kg.
- Energy per unit mass: J/kg (also m²/s²).
Both units are defined exactly, so the factor is exact. Calorie per Gram definition: calorie per gram; Joule per Kilogram definition: joule per kilogram.
Worked examples
- A reading of 80 cal/g converts to 334944 J/kg.
80 cal/g × 4186.8 = 334944 J/kg - A value of 1000 cal/g is 4186800 J/kg.
1000 cal/g × 4186.8 = 4186800 J/kg
Calorie per Gram to Joule per Kilogram conversion table
| Calories per Gram (cal/g) | Joules per Kilogram (J/kg) |
|---|---|
| 1 cal/g | 4186.8 J/kg |
| 10 cal/g | 41868 J/kg |
| 50 cal/g | 209340 J/kg |
| 80 cal/g | 334944 J/kg |
| 100 cal/g | 418680 J/kg |
| 540 cal/g | 2260872 J/kg |
| 1000 cal/g | 4186800 J/kg |
| 4000 cal/g | 16747200 J/kg |
| 9000 cal/g | 37681200 J/kg |
| 11000 cal/g | 46054800 J/kg |
Where it's used
Calories per Gram are used for latent heat problems in CGS units, while joules per kilogram appear in specific enthalpy h and internal energy u. 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 kilogram | 4186.8 J/kg |
| 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 kilowatt-hour per kilogram | 0.001163 kWh/kg |
| calorie per gram to joule per gram | 4.1868 J/g |
Frequently asked questions
How many joules per kilogram are in 1 calorie per gram?
1 cal/g = 4186.8 J/kg.
How do I convert calories per gram to joules per kilogram?
Multiply the value in cal/g by 4186.8. For example, 15 cal/g × 4186.8 = 62802 J/kg.
Is the cal/g to J/kg conversion exact?
Yes. Both units are defined exactly, and 1 cal/g is exactly 4186.8 J/kg.
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). Calories per Gram to Joules per Kilogram (cal/g to J/kg). Retrieved October 29, 2026, from https://scientificconverters.com/specific-energy/calories-per-gram-to-joules-per-kilogram/
IEEE
Scientific Converters, "Calories per Gram to Joules per Kilogram (cal/g to J/kg)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/specific-energy/calories-per-gram-to-joules-per-kilogram/