kJ to kcal Converter
Convert kilojoule to kilocalorie (food calorie) instantly. 1 kJ = 0.2390057361 kcal, worked steps and a full reference table.
How to use it
- Type the value in kilojoule — the result updates as you type.
- Use Swap to flip the direction, or change either dropdown to convert between any two units.
- Click the result to copy it. The URL updates too, so you can bookmark or share the exact conversion.
Examples
| 1 kJ | 0.2390057361 kcal |
| 5 kJ | 1.195028681 kcal |
| 10 kJ | 2.390057361 kcal |
| 100 kJ | 23.90057361 kcal |
One kilojoule equals 0.23900574 kilocalorie (food calorie)s (kcal). To convert kilojoules to kilocalorie (food calorie)s, multiply by 0.23900574; to go back the other way, multiply by 4.184 instead.
The converter above does it as you type and shows the working underneath, so you can check the arithmetic rather than take the number on trust.
What kilojoules and kilocalorie (food calorie)s actually measure
Kilojoule (kJ) — A kilojoule is a thousand joules. Nutrition labels outside the US, and heating calculations.
Kilocalorie (food Calorie) (kcal) — A kilocalorie is a thousand small calories. Food labels call it a Calorie, capitalised. Nutrition and diet planning.
kJ to kcal conversion table
The most common values, worked out in advance. Anything not listed can be typed straight into the converter.
| kJ | kcal |
|---|---|
| 1 kJ | 0.23900574 kcal |
| 2 kJ | 0.47801147 kcal |
| 5 kJ | 1.1950287 kcal |
| 10 kJ | 2.3900574 kcal |
| 25 kJ | 5.9751434 kcal |
| 50 kJ | 11.950287 kcal |
| 100 kJ | 23.900574 kcal |
How to convert kilojoules to kilocalorie (food calorie)s by hand
Multiply the number of kilojoules by 0.23900574.
For example, 25 kJ × 0.23900574 = 5.9751434 kcal.
Going the other way, divide by 0.23900574 — or multiply by 4.184, which is the same thing and easier to do in your head.
Everything runs in your browser
There is no server involved in the calculation. The numbers you type never leave your device, nothing is logged, and the page keeps working with no connection once it has loaded. That is not a marketing line — it is simply how the tool is built, because a calculation like this has no reason to touch a network.
Questions people ask
How many kcal are in 1 kJ?
1 kJ equals exactly 0.2390057361 kcal. Multiply any value in kilojoule by 0.2390057361 to get kilocalorie (food calorie).
Is anything uploaded to a server?
No. The whole calculation happens in your browser. Nothing is sent anywhere, and the page keeps working offline once loaded.
Last updated 18 August 2026