Convert Kilojoules to Kilocalories
1 kilojoule (kJ) equals 0.2390057361 kilocalories (kcal).
1 kJ = 0.2390057361 kcal
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk kilojoule to kilocalorie converter to paste a column from Excel.
How to Convert Kilojoule to Kilocalorie
- 1 kJ = 0.2390057361 kcal
- 1 kcal = 4.184 kJ
- Example: convert 1000 kJ to kcal: 1000 kJ = 1000 × 0.2390057361 kcal = 239.0057361 kcal
Reference conditions. kcal: Thermochemical kilocalorie (food Calorie), 4184 J exactly.
Formula
kcal = kJ × 0.2390057361377
or kcal = kJ ÷ 4.184
Derivation from SI units:
- 1 kJ = 10³ J
- 1 kcal = 1000 cal = 4184 J (exact)
- 1 kJ = 1000 J ÷ 4184 J per kcal = 0.2390057361377 kcal
Both units are defined exactly, so the factor is exact. Kilojoule definition: kilojoule; Kilocalorie definition: kilocalorie.
Worked examples
- The Australian average adult intake of 8700 kJ is 2079.349904 kcal.
8700 kJ × 0.2390057361 = 2079.349904 kcal - A 500 kJ serving is 119.5028681 kcal.
500 kJ × 0.2390057361 = 119.5028681 kcal
Kilojoule to Kilocalorie conversion table
| Kilojoules (kJ) | Kilocalories (kcal) |
|---|---|
| 1 kJ | 0.2390057361 kcal |
| 4.184 kJ | 1 kcal |
| 10 kJ | 2.390057361 kcal |
| 50 kJ | 11.95028681 kcal |
| 100 kJ | 23.90057361 kcal |
| 250 kJ | 59.75143403 kcal |
| 500 kJ | 119.5028681 kcal |
| 840 kJ | 200.7648184 kcal |
| 1000 kJ | 239.0057361 kcal |
| 2000 kJ | 478.0114723 kcal |
| 8700 kJ | 2079.349904 kcal |
| 10000 kJ | 2390.057361 kcal |
Where it's used
Nutrition values in kilojoules are converted to kilocalories (food Calories) for diet tracking apps and US-style labels. Divide by 4.184.
Kilojoule to other energy units
| Conversion | 1 kJ equals |
|---|---|
| kilojoule to joule | 1000 J |
| kilojoule to megajoule | 0.001 MJ |
| kilojoule to calorie | 239.0057361 cal |
| kilojoule to kilocalorie | 0.2390057361 kcal |
| kilojoule to watt-hour | 0.2777777778 Wh |
| kilojoule to kilowatt-hour | 0.0002777777778 kWh |
| kilojoule to BTU | 0.9478171203 BTU |
| kilojoule to therm | 0.00000948043428 thm |
| kilojoule to electronvolt | 6.241509074 × 10²¹ eV |
| kilojoule to foot-pound | 737.5621493 ft·lbf |
| kilojoule to erg | 10000000000 erg |
Frequently asked questions
How do I convert kJ to calories?
Divide kilojoules by 4.184 to get food Calories (kcal): 1000 kJ = 239 kcal.
How many kilocalories are in 1 kilojoule?
1 kJ = 0.2390057361 kcal.
How do I convert kilojoules to kilocalories?
Multiply the value in kJ by 0.2390057361, or divide it by 4.184. For example, 1000 kJ × 0.2390057361 = 239.0057361 kcal.
Is the kJ to kcal 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 7, SI prefixes.
- 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, "kilocalorie (thermochemical)".
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 Kilojoules to Kilocalories. Retrieved October 17, 2026, from https://scientificconverters.com/energy/kilojoules-to-kilocalories/
IEEE
Scientific Converters, "Convert Kilojoules to Kilocalories," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/energy/kilojoules-to-kilocalories/