Convert joules to kilocalories
Joule (J) to kilocalorie (kcal). One joule equals 0.000239 kilocalories.
Formula
Joule to kilocalorie conversion table
| Joules | Kilocalories | Kilocalories | Joules |
|---|---|---|---|
| 1 J | 0.000239 kcal | 1 kcal | 4184 J |
| 2 J | 0.000478 kcal | 2 kcal | 8368 J |
| 3 J | 0.000717 kcal | 3 kcal | 12552 J |
| 5 J | 0.001195 kcal | 5 kcal | 20920 J |
| 10 J | 0.00239 kcal | 10 kcal | 41840 J |
| 20 J | 0.00478 kcal | 20 kcal | 83680 J |
| 50 J | 0.01195 kcal | 50 kcal | 209200 J |
| 100 J | 0.023901 kcal | 100 kcal | 418400 J |
| 500 J | 0.119503 kcal | 500 kcal | 2092000 J |
| 1000 J | 0.239006 kcal | 1000 kcal | 4184000 J |
To convert joules to kilocalories, divide the number of joules by 4184. One joule equals 0.000239 kilocalories, and one kilocalorie equals 4184 joules, so the relationship is fixed and exact. As a worked example, 10 J comes to 0.00239 kcal. Enter your own figure in the converter above to get an instant answer, or use the swap button to flip the direction. This is a energy conversion, and like every tool on UnitGlide it runs locally in your browser with no account or upload required. The table further down shows a range of common joule values already worked out in kilocalories, plus the reverse kilocalorie to joule direction, which is handy for quick reference or double-checking a result by hand.
Frequently asked questions
How many kilocalories are in a joule?
One joule equals 0.000239 kilocalories. The ratio is constant, so you can multiply any number of joules by 0.000239 to get kilocalories.
What is the formula to convert joules to kilocalories?
Use kilocalories = joules ÷ 4184. UnitGlide applies this exact formula for every value, so results stay accurate across the whole range.
How do I convert kilocalories back to joules?
Go the other way by using one kilocalorie equals 4184 joules. You can also press the swap button in the converter above to flip the direction in one click.
Is this joule to kilocalorie converter accurate?
Yes. It uses internationally defined SI conversion factors, as maintained by the BIPM, and all math runs in your browser so nothing is rounded away on a server. For everyday use the displayed precision is more than enough.