Kilojoules to Kilocalories
Convert kilojoules to kilocalories instantly. 1 kJ = 0.2390057361 kcal. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert kilojoules to kilocalories
To convert kilojoules to kilocalories, divide by 4.184 (multiply by 0.2390057361). The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
kcal = kJ × 0.2390057361
Kilojoules to Kilocalories conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Kilojoules | Kilocalories |
|---|---|
| 1 kJ | 0.239006 kcal |
| 2 kJ | 0.478011 kcal |
| 3 kJ | 0.717017 kcal |
| 5 kJ | 1.195029 kcal |
| 10 kJ | 2.390057 kcal |
| 20 kJ | 4.780115 kcal |
| 25 kJ | 5.975143 kcal |
| 50 kJ | 11.950287 kcal |
| 100 kJ | 23.900574 kcal |
| 500 kJ | 119.502868 kcal |
| 1,000 kJ | 239.005736 kcal |
What is a kilojoule?
A thousand joules. Food energy is labelled in kilojoules outside the US.
What is a kilocalory?
The food Calorie, equal to a thousand small calories.
The formula
kcal = kJ × 0.2390057361
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the Kilojoules to Kilocalories
- Type the number of kilojoules you want to convert.
- Read the result in kilocalories straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked kilocalories to kilojoules page.
Kilojoules to Kilocalories — frequently asked questions
How many kilocalories are in a kilojoule?
One kilojoule equals 0.2390057361 kcal. kcal = kJ × 0.2390057361
What is the formula to convert kilojoules to kilocalories?
The formula is kcal = kJ × 0.2390057361. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert kilocalories back to kilojoules?
Divide instead of multiplying: one kilocalory is 4.184 kJ. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this kilojoules to kilocalories free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
What people search for
This page answers each of these searches. They are the exact phrases visitors use to find the kilojoules to kilocalories.
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 19, 2026 · Calculation runs client-side · No data collected · Report an error