Kilojoules to Calories
Convert kilojoules to calories instantly. 1 kJ = 239.0057361377 cal. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert kilojoules to calories
To convert kilojoules to calories, multiply by 239.0057361377. 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.
cal = kJ × 239.0057361377
Kilojoules to Calories conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Kilojoules | Calories |
|---|---|
| 1 kJ | 239.005736 cal |
| 2 kJ | 478.011472 cal |
| 3 kJ | 717.017208 cal |
| 5 kJ | 1,195.03 cal |
| 10 kJ | 2,390.06 cal |
| 20 kJ | 4,780.11 cal |
| 25 kJ | 5,975.14 cal |
| 50 kJ | 11,950.29 cal |
| 100 kJ | 23,900.57 cal |
| 500 kJ | 119,502.87 cal |
| 1,000 kJ | 239,005.74 cal |
What is a kilojoule?
A thousand joules. Food energy is labelled in kilojoules outside the US.
What is a calory?
The small calorie: energy to raise one gram of water by one degree.
The formula
cal = kJ × 239.0057361377
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 Calories
- Type the number of kilojoules you want to convert.
- Read the result in calories 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 calories to kilojoules page.
Kilojoules to Calories — frequently asked questions
How many calories are in a kilojoule?
One kilojoule equals 239.0057361377 cal. cal = kJ × 239.0057361377
What is the formula to convert kilojoules to calories?
The formula is cal = kJ × 239.0057361377. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert calories back to kilojoules?
Divide instead of multiplying: one calory is 0.004184 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 calories 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 calories.
- kilojoules to calories
- 1 kilojoule to calories
- how many calories in a kilojoule
- kj2cal
- kilojoules in calories
- convert kilojoules to calories
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