kcal to kJ
Type kilocalories to get kilojoules, or kilojoules to get kilocalories, as on food labels.
Megajoules
| kcal | kJ |
|---|---|
| 50 kcal | 209 kJ |
| 100 kcal | 418 kJ |
| 200 kcal | 837 kJ |
| 250 kcal | 1046 kJ |
| 500 kcal | 2092 kJ |
| 1000 kcal | 4184 kJ |
| 2000 kcal | 8368 kJ |
| 2500 kcal | 10460 kJ |
How it works
kJ = kcal × 4.184kcal = kJ ÷ 4.184Worked example
- 250 kcal × 4.184
- = 1,046 kJ
- a typical snack bar
Frequently asked questions
Is a food Calorie the same as a kilocalorie?
Yes. The “Calorie” on food (capital C) is a kilocalorie: 1,000 small calories.
How many kJ a day does an adult need?
About 8,700 kJ (2,080 kcal) is the reference used on food labels; real needs depend on size and activity.