Convert kilocalories to joules
Kilocalorie (kcal) to joule (J). One kilocalorie equals 4184 joules.
Formula
Kilocalorie to joule conversion table
| Kilocalories | Joules | Joules | Kilocalories |
|---|---|---|---|
| 1 kcal | 4184 J | 1 J | 0.000239 kcal |
| 2 kcal | 8368 J | 2 J | 0.000478 kcal |
| 3 kcal | 12552 J | 3 J | 0.000717 kcal |
| 5 kcal | 20920 J | 5 J | 0.001195 kcal |
| 10 kcal | 41840 J | 10 J | 0.00239 kcal |
| 20 kcal | 83680 J | 20 J | 0.00478 kcal |
| 50 kcal | 209200 J | 50 J | 0.01195 kcal |
| 100 kcal | 418400 J | 100 J | 0.023901 kcal |
| 500 kcal | 2092000 J | 500 J | 0.119503 kcal |
| 1000 kcal | 4184000 J | 1000 J | 0.239006 kcal |
To convert kilocalories to joules, multiply the number of kilocalories by 4184. One kilocalorie equals 4184 joules, and one joule equals 0.000239 kilocalories, so the relationship is fixed and exact. As a worked example, 10 kcal comes to 41840 J. 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 kilocalorie values already worked out in joules, plus the reverse joule to kilocalorie direction, which is handy for quick reference or double-checking a result by hand.
Frequently asked questions
How many joules are in a kilocalorie?
One kilocalorie equals 4184 joules. The ratio is constant, so you can multiply any number of kilocalories by 4184 to get joules.
What is the formula to convert kilocalories to joules?
Use joules = kilocalories × 4184. UnitGlide applies this exact formula for every value, so results stay accurate across the whole range.
How do I convert joules back to kilocalories?
Go the other way by using one joule equals 0.000239 kilocalories. You can also press the swap button in the converter above to flip the direction in one click.
Is this kilocalorie to joule 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.