Convert Joules to Kilocalories
J to kcal · energy conversion
What are joules and kilocalories?
The joule is the SI unit of energy, the work done by one newton acting over one meter. A kilocalorie (the food Calorie) is 1,000 small calories, the unit on US nutrition labels. For reference: a food Calorie is one kilocalorie (4,184 J), and home electricity is billed in kilowatt-hours.
How to convert joules to kilocalories
1 J = 0.000239006 kcal. To convert, multiply the number of joules by 0.000239006. For example, 5 J = 0.00119503 kcal, and 20 J = 0.00478011 kcal. To go the other way, multiply kilocalories by 4,184 (since 1 kcal = 4,184 J).
Joules to Kilocalories conversion table
| Joules (J) | Kilocalories (kcal) |
|---|---|
| 1 | 0.000239006 |
| 10 | 0.00239006 |
| 100 | 0.0239006 |
| 500 | 0.119503 |
| 1,000 | 0.239006 |
| 2,000 | 0.478011 |
| 5,000 | 1.19503 |
FAQ
What is 1 J in kcal?
1 J = 0.000239006 kcal. To convert any amount, multiply the number of joules by 0.000239006.
How do I convert kilocalories back to joules?
Go the other way: 1 kcal = 4,184 J, so multiply kilocalories by 4,184 to get joules.
Is a joule bigger than a kilocalorie?
No — 1 J is the smaller unit, equal to 0.000239006 kcal (it takes 4,184 J to make one kcal).
Are these energy conversions exact?
They use the standard internationally-defined conversion factors. Results are rounded to six significant figures for readability, which is accurate enough for everyday and most technical use.