1 kcal equals 4.184 kJ. To convert kcal to kJ, multiply the value by 4.184; divide by 4.184 to convert back. Enter any number above and the result appears instantly — free and entirely in your browser.
How do you convert kcal to kJ?
The conversion formula is kJ = kcal × 4.184. The conversion factor is fixed by definition, so the result is always exact.
kcal to kJ conversion table
| kcal | kJ |
|---|---|
| 1 kcal | 4.184 kJ |
| 2 kcal | 8.368 kJ |
| 5 kcal | 20.92 kJ |
| 10 kcal | 41.84 kJ |
| 100 kcal | 418.4 kJ |
| 1,000 kcal | 4,184 kJ |
What is kcal (kcal)?
The kilocalorie (kcal), also written Calorie, equals 1,000 calories or 4.184 kJ. It is the food-energy unit used in nutrition worldwide.
What is kJ (kJ)?
The kilojoule (kJ) equals 1,000 joules. It is the SI energy unit on European food labels, usually shown next to kilocalories.
Why convert kcal to kJ?
Energy units come from different fields: joules and kilojoules in physics, kilocalories on food labels, kilowatt-hours on electricity bills, BTU in heating and air-conditioning. Converting between them is common for nutrition, utility bills and HVAC.
One kilocalorie (the food Calorie) equals exactly 4.184 kJ — which is why nutrition labels show both. One kilowatt-hour is 3.6 MJ, equal to about 3,412 BTU or 860 kcal (BIPM/ISO).
How to convert kcal to kJ
- Enter the value in kcal into the left field of the converter.
- Read the result in kJ instantly in the right field — it updates automatically.
- Use the swap button to reverse the direction (kJ to kcal).
The converter runs entirely in your browser: no uploads, no queue, no limits. You can even use it offline.