Convert Kilocalories per Kilogram to Kilojoules per Kilogram
1 kilocalorie per kilogram (kcal/kg) = 4.1868 kilojoules per kilogram (kJ/kg). 1 kJ/kg = 0.2388458966 kcal/kg. Example: 4500 kcal/kg = 4500 × 4.1868 = 18840.6 kJ/kg.
Also searched as kcal/kg to kJ/kg, kcal per kg to kj per kg and GCV kcal/kg to kJ/kg.
1 kcal/kg = 4.1868 kJ/kg
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk kilocalorie per kilogram to kilojoule per kilogram converter to paste a column from Excel.
How to Convert Kilocalorie per Kilogram to Kilojoule per Kilogram
- 1 kcal/kg = 4.1868 kJ/kg
- 1 kJ/kg = 0.2388458966 kcal/kg
- Example: convert 4500 kcal/kg to kJ/kg: 4500 kcal/kg = 4500 × 4.1868 kJ/kg = 18840.6 kJ/kg
Reference conditions. kcal/kg: International Table calorie (4.1868 J).
Formula
kJ/kg = kcal/kg × 4.1868
Derivation from SI units:
- 1 kcal_IT/kg = 4186.8 J/kg.
- 1 kJ/kg = 1000 J/kg.
- 1 kcal/kg = 4186.8 J/kg ÷ 1000 J/kg per kJ/kg = 4.1868 kJ/kg
Both units are defined exactly, so the factor is exact. Kilocalorie per Kilogram definition: kilocalorie per kilogram; Kilojoule per Kilogram definition: kilojoule per kilogram.
Worked examples
- A coal of 4500 kcal/kg GCV is 18840.6 kJ/kg.
4500 kcal/kg × 4.1868 = 18840.6 kJ/kg - A latent heat of 540 kcal/kg is 2260.872 kJ/kg.
540 kcal/kg × 4.1868 = 2260.872 kJ/kg
Kilocalorie per Kilogram to Kilojoule per Kilogram conversion table
| Kilocalories per Kilogram (kcal/kg) | Kilojoules per Kilogram (kJ/kg) |
|---|---|
| 1 kcal/kg | 4.1868 kJ/kg |
| 10 kcal/kg | 41.868 kJ/kg |
| 80 kcal/kg | 334.944 kJ/kg |
| 100 kcal/kg | 418.68 kJ/kg |
| 540 kcal/kg | 2260.872 kJ/kg |
| 1000 kcal/kg | 4186.8 kJ/kg |
| 3500 kcal/kg | 14653.8 kJ/kg |
| 4500 kcal/kg | 18840.6 kJ/kg |
| 6000 kcal/kg | 25120.8 kJ/kg |
| 10500 kcal/kg | 43961.4 kJ/kg |
Where it's used
Calorific values in kcal/kg from Indian coal grades and older texts are converted to kJ/kg. Multiply by 4.1868.
Kilocalorie per Kilogram to other specific energy units
| Conversion | 1 kcal/kg equals |
|---|---|
| kilocalorie per kilogram to kilojoule per kilogram | 4.1868 kJ/kg |
| kilocalorie per kilogram to megajoule per kilogram | 0.0041868 MJ/kg |
| kilocalorie per kilogram to BTU per pound | 1.8 BTU/lb |
| kilocalorie per kilogram to joule per kilogram | 4186.8 J/kg |
| kilocalorie per kilogram to calorie per gram | 1 cal/g |
| kilocalorie per kilogram to kilowatt-hour per kilogram | 0.001163 kWh/kg |
| kilocalorie per kilogram to joule per gram | 4.1868 J/g |
Frequently asked questions
How many kJ/kg is 1 kcal/kg?
Exactly 4.1868 kJ/kg (International Table kilocalorie).
How many kilojoules per kilogram are in 1 kilocalorie per kilogram?
1 kcal/kg = 4.1868 kJ/kg.
How do I convert kilocalories per kilogram to kilojoules per kilogram?
Multiply the value in kcal/kg by 4.1868. For example, 4500 kcal/kg × 4.1868 = 18840.6 kJ/kg.
Is the kcal/kg to kJ/kg conversion exact?
Yes. Both units are defined exactly, and 1 kcal/kg is exactly 4.1868 kJ/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). Convert Kilocalories per Kilogram to Kilojoules per Kilogram. Retrieved October 29, 2026, from https://scientificconverters.com/specific-energy/kilocalories-per-kilogram-to-kilojoules-per-kilogram/
IEEE
Scientific Converters, "Convert Kilocalories per Kilogram to Kilojoules per Kilogram," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/specific-energy/kilocalories-per-kilogram-to-kilojoules-per-kilogram/