How to convert kilocalories to kilojoules
One kilocalorie equals 4.184 kilojoules. To convert, multiply the number of kilocalories by 4.184:
Mental-math shortcut: Multiply kilocalories by 4.2 for a quick estimate (exact: 4.184): 500 kcal ≈ 2,092 kJ.
Example
Convert 500 kilocalories to kilojoules: 500 kcal × 4.184 = 2,092 kJ.
Kilocalories to Kilojoules conversion chart
| Kilocalories (kcal) | Kilojoules (kJ) |
|---|---|
| 1 | 4.184 |
| 50 | 209.2 |
| 100 | 418.4 |
| 200 | 836.8 |
| 250 | 1,046 |
| 300 | 1,255.2 |
| 500 | 2,092 |
| 750 | 3,138 |
| 1,000 | 4,184 |
| 1,500 | 6,276 |
| 2,000 | 8,368 |
| 2,500 | 10,460 |
| 3,000 | 12,552 |
What is a kilocalorie?
A kilocalorie (kcal) is 1,000 small calories, or 4.184 kilojoules. It is the "Calorie" printed on US nutrition labels and used for diets and exercise — a typical adult needs roughly 1,800–2,800 kcal a day.
What is a kilojoule?
A kilojoule (kJ) is 1,000 joules. Australia, New Zealand and the EU list food energy in kilojoules alongside (or instead of) calories. One kilocalorie equals 4.184 kJ, so an 8,700 kJ daily intake — the Australian reference value — is about 2,080 kcal.
Converting the other way? Use the Kilojoules to Kilocalories converter.
Frequently asked questions
How many kilojoules is one kilocalorie?
One kilocalorie is 4.184 kilojoules.
How do I convert kilocalories to kilojoules?
Multiply the value in kilocalories by 4.184. For example, 500 kcal × 4.184 = 2,092 kJ.
What is 2,000 kcal in kilojoules?
2,000 kcal is 8,368 kilojoules.
How do I convert kilojoules to kilocalories?
Multiply kilojoules by 0.239006 (or divide by 4.184). You can also use our Kilojoules to Kilocalories converter.
Conversions use the internationally agreed definitions of each unit (for example, 1 inch = 2.54 cm exactly) and are rounded for display. Volume converters use US customary units unless stated otherwise.
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