J to Kilocalories converter (J to kcal)
Convert J (J) to Kilocalories (kcal) with this free calculator. Type a value, press Convert, and the page applies the same factor shown in the formula below — no rounded shortcut, and nothing is stored on a server.
How to convert J to Kilocalories
1 joule (J) is equal to 0.000239006 kilocalories (kcal).
E(kcal) = E(J) ÷ 4184
Divide the energy in joules by 4184:
Example: Convert 10000 J to kcal:
E(kcal) = 10000 ÷ 4184 = 2.39 kcal
What is a J?
The J (J) is the starting or target unit on this page. Use the calculator above to convert values without looking up the factor by hand.
What is a Kilocalories?
The Kilocalories (kcal) is the starting or target unit on this page. Use the calculator above to convert values without looking up the factor by hand.
This page converts energy from J into Kilocalories. One J equals 0.000239006 kcal.
J to Kilocalories conversion table
Common J values and the matching kcal result, calculated with the same factor as the widget. Highlight a nearby row if you want a quick check without entering a number.
| J (J) | Kilocalories (kcal) |
|---|---|
| 0 J | 0 kcal |
| 100 J | 0.023900574 kcal |
| 500 J | 0.119502868 kcal |
| 1000 J | 0.239005736 kcal |
| 5000 J | 1.19502868 kcal |
| 10000 J | 2.390057361 kcal |
How this calculator works
The form on this page is a J-to-Kilocalories converter. After you enter a number, JavaScript multiplies or rearranges it with the published conversion factor and writes the kcal result in the output box. The step-by-step panel repeats the arithmetic so you can copy it into homework or a spreadsheet.
Reviewed by Hamsen, founder of GigaTables and a biology engineer. See the about page for how formulas are checked before a tool is published.
FAQ
How many kcal are in 1 J?
1 J = 0.000239006 kcal.
How do I convert J to Kilocalories?
Divide the energy in joules by 4184:
Is this J to kcal converter free?
Yes. GigaTables calculators are free to use in a browser. You do not need an account, and the values you type are not uploaded.