kilocalories to kilojoules
Convert kilocalorie (food cal) to kilojoule — instant, free, with the formula shown.
How to convert kilocalorie (food cal) to kilojoule
To convert kilocalorie (food cal) to kilojoule, multiply by 4.184:
For example, 10 kcal × 4.184 = 41.84 kJ.
kcal to kJ conversion table
| kilocalories (kcal) | kilojoules (kJ) |
|---|---|
| 1 kcal | 4.184 kJ |
| 2 kcal | 8.368 kJ |
| 5 kcal | 20.92 kJ |
| 10 kcal | 41.84 kJ |
| 25 kcal | 104.6 kJ |
| 50 kcal | 209.2 kJ |
| 100 kcal | 418.4 kJ |
| 250 kcal | 1046 kJ |
| 500 kcal | 2092 kJ |
| 1000 kcal | 4184 kJ |
Other kilocalorie (food cal) conversions
Convert to kilojoule from another unit
kcal to kJ — frequently asked
How many kilojoules are in 1 kilocalorie (food cal)?
1 kilocalorie (food cal) = 4.184 kilojoules (kcal × 4.184 = kJ).
What is the formula to convert kilocalorie (food cal) to kilojoule?
Multiply your kilocalorie (food cal) value by 4.184 to get kilojoule.
How do I convert 10 kilocalories to kilojoules?
10 kcal = 41.84 kJ. For 100 kcal the answer is 418.4 kJ. Use the calculator on this page for any other value.
When to convert kilocalorie (food cal) to kilojoule
Energy conversion — common questions
Is a food calorie the same as a calorie?
No — a food 'Calorie' (capital C) actually means 1 kilocalorie = 1,000 small calories = 4,184 J. Nutrition labels typically write 'cal' meaning kcal.
How many joules in 1 kWh?
1 kWh = 3,600,000 J (3.6 MJ). Because 1 kW × 1 hour = 1,000 W × 3,600 s = 3,600,000 J.
What is a BTU?
British Thermal Unit — the energy required to raise 1 pound of water by 1 °F. 1 BTU ≈ 1,055 J.