Calories to Kilojoules Converter
Convert kilocalories to kilojoules in your browser, with a full reference table and the formula behind it. Free, instant, no sign-up.
How to convert kilocalories to kilojoules
kilojoules = kilocalories × 4.184
One kilocalorie is 4.184 kilojoules, so any conversion is a single multiplication. To go the other way, divide by 4.184 instead. The converter above is already set to kilocalories and kilojoules, so you can type any value and read the answer straight away.
Calories to Kilojoules conversion table
Common values, worked out in advance:
| Kilocalories (kcal) | Kilojoules (kJ) |
|---|---|
| 1 kcal | 4.184 kJ |
| 5 kcal | 20.92 kJ |
| 10 kcal | 41.84 kJ |
| 50 kcal | 209.2 kJ |
| 100 kcal | 418.4 kJ |
| 250 kcal | 1,046 kJ |
| 500 kcal | 2,092 kJ |
| 1,000 kcal | 4,184 kJ |
| 2,000 kcal | 8,368 kJ |
The quick mental version
For a rough answer without a calculator, remember that 1 kJ is about 0.239006 kcal. That is usually close enough for shopping, travel and DIY, and the converter above gives you the exact figure when it matters.
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Frequently asked questions
How many kilojoules are in 1 kcal?
One kcal is 4.184 kJ. The table above covers the values people look up most often.
What is the formula to convert kilocalories to kilojoules?
kilojoules = kilocalories × 4.184. One kilocalorie is 4.184 kilojoules, so any conversion is a single multiplication. To go the other way, divide by 4.184 instead.
Is this calories to kilojoules converter accurate?
Yes. It uses the exact internationally defined conversion factors and calculates in your browser, so nothing is rounded until the result is displayed.
Can I convert kilojoules back to kilocalories here?
Yes. Use the swap button in the converter to reverse the direction, or pick any other pair of units from the two dropdowns.