Kilocalories to Kilojoules Converter (kcal to kJ)
Type a value in kilocalories to see it in kilojoules instantly.
1 kilocalorie (kcal) = 4.184 kilojoules (kJ)
1 kilojoule (kJ) = 0.239005736 kilocalories (kcal)
How to convert kilocalories to kilojoules
Multiply the number of kilocalories by 4.184.
kJ = kcal × 4.184
Example: 2,000 kcal × 4.184 = 8,368 kJ
A 2,000 kcal daily diet is 8,368 kJ. Australian and New Zealand food labels list kJ first, so a 250 kcal snack appears as 1,046 kJ.
kcal to kJ conversion table
| Kilocalories (kcal) | Kilojoules (kJ) |
|---|---|
| 1 kcal | 4.184 kJ |
| 10 kcal | 41.84 kJ |
| 50 kcal | 209.2 kJ |
| 100 kcal | 418.4 kJ |
| 150 kcal | 627.6 kJ |
| 200 kcal | 836.8 kJ |
| 250 kcal | 1,046 kJ |
| 300 kcal | 1,255.2 kJ |
| 400 kcal | 1,673.6 kJ |
| 500 kcal | 2,092 kJ |
| 750 kcal | 3,138 kJ |
| 1,000 kcal | 4,184 kJ |
| 1,500 kcal | 6,276 kJ |
| 2,000 kcal | 8,368 kJ |
| 2,500 kcal | 10,460 kJ |
| 3,000 kcal | 12,552 kJ |
About the units
Kilocalorie (kcal)
A kilocalorie is 1,000 thermochemical calories, exactly 4,184 joules. The "Calories" on food labels are kilocalories.
Kilojoule (kJ)
A kilojoule is 1,000 joules. Food labels in the EU, Australia and New Zealand show energy in kilojoules alongside kilocalories.
Frequently asked questions
How many kilojoules are in 1 kilocalorie?
1 kilocalorie equals 4.184 kilojoules.
How do I convert kilocalories to kilojoules?
Multiply the number of kilocalories by 4.184. For example, 2,000 kcal × 4.184 = 8,368 kJ.
How many kilocalories are in 1 kilojoule?
1 kilojoule equals 0.239005736 kilocalories.
Is a food Calorie the same as a kcal?
Yes. A capital-C food Calorie is one kilocalorie (1,000 small calories), which is 4.184 kJ.
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Background reading: SI Derived Units.