Kilocalories to kilojoules
Enter a value in kilocalories (food calories) to convert it to kilojoules. 1 kcal = 4.184 kJ.
1 kcal = 4.184 kJ
Formula
kJ = kcal × 4.184
Worked example
10 kcal × 4.184 = 41.84 kJ
Results on this page are rounded to 4 decimal places (4 significant figures below 1). Use the decimal places option above for a different rounding.
Kilocalories to kilojoules table
| Kilocalories (food calories) (kcal) | Kilojoules (kJ) |
|---|---|
| 1 kcal | 4.184 kJ |
| 2 kcal | 8.368 kJ |
| 5 kcal | 20.92 kJ |
| 10 kcal | 41.84 kJ |
| 15 kcal | 62.76 kJ |
| 20 kcal | 83.68 kJ |
| 25 kcal | 104.6 kJ |
| 50 kcal | 209.2 kJ |
| 75 kcal | 313.8 kJ |
| 100 kcal | 418.4 kJ |
| 250 kcal | 1,046 kJ |
| 500 kcal | 2,092 kJ |
| 1,000 kcal | 4,184 kJ |
Good to know
Energy is converted through joules. A food calorie (kcal) is 4,184 J, a kilowatt-hour is 3.6 million J and the international BTU is about 1,055.06 J.