Joules to Kilocalories
Convert joules to kilocalories instantly. 1 J = 0.0002390057 kcal. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert joules to kilocalories
To convert joules to kilocalories, divide by 4,184 (multiply by 0.0002390057). 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 = J × 0.0002390057
Joules to Kilocalories conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Joules | Kilocalories |
|---|---|
| 1 J | 0.000239 kcal |
| 2 J | 0.000478 kcal |
| 3 J | 0.000717 kcal |
| 5 J | 0.001195 kcal |
| 10 J | 0.00239 kcal |
| 20 J | 0.00478 kcal |
| 25 J | 0.005975 kcal |
| 50 J | 0.01195 kcal |
| 100 J | 0.023901 kcal |
| 500 J | 0.119503 kcal |
| 1,000 J | 0.239006 kcal |
What is a joule?
The SI unit of energy: one newton-metre, or one watt for one second.
What is a kilocalory?
The food Calorie, equal to a thousand small calories.
The formula
kcal = J × 0.0002390057
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 Joules to Kilocalories
- Type the number of joules 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 joules page.
Joules to Kilocalories — frequently asked questions
How many kilocalories are in a joule?
One joule equals 0.0002390057 kcal. kcal = J × 0.0002390057
What is the formula to convert joules to kilocalories?
The formula is kcal = J × 0.0002390057. 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 joules?
Divide instead of multiplying: one kilocalory is 4,184 J. 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 joules 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 joules 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