How to convert joules to kilocalories
To convert joules to kilocalories, multiply the value by the conversion factor 0.0002390057. To go the other way, multiply by 4,184 (or divide by 0.0002390057).
Worked example: 25 J to kcal
- Write the value: 25 J
- Multiply by 0.0002390057: 25 × 0.0002390057
- Result: 0.00597514 kcal
Joule to Kilocalorie conversion table
Quick reference values, rounded to 6 significant digits.
| Joule (J) | Kilocalorie (kcal) |
|---|---|
| 0.1 J | 0.0000239006 kcal |
| 0.25 J | 0.0000597514 kcal |
| 0.5 J | 0.000119503 kcal |
| 1 J | 0.000239006 kcal |
| 2 J | 0.000478011 kcal |
| 3 J | 0.000717017 kcal |
| 4 J | 0.000956023 kcal |
| 5 J | 0.00119503 kcal |
| 6 J | 0.00143403 kcal |
| 7 J | 0.00167304 kcal |
| 8 J | 0.00191205 kcal |
| 9 J | 0.00215105 kcal |
| 10 J | 0.00239006 kcal |
| 12 J | 0.00286807 kcal |
| 15 J | 0.00358509 kcal |
| 20 J | 0.00478011 kcal |
| 25 J | 0.00597514 kcal |
| 30 J | 0.00717017 kcal |
| 40 J | 0.00956023 kcal |
| 50 J | 0.0119503 kcal |
| 75 J | 0.0179254 kcal |
| 100 J | 0.0239006 kcal |
| 250 J | 0.0597514 kcal |
| 500 J | 0.119503 kcal |
| 1,000 J | 0.239006 kcal |
Kilocalorie to Joule
| kcal | J |
|---|---|
| 1 kcal | 4,184 J |
| 5 kcal | 20,920 J |
| 10 kcal | 41,840 J |
| 50 kcal | 209,200 J |
| 100 kcal | 418,400 J |
1 Joule in other energy units
About Joule and Kilocalorie
What is a joule (J)?
The joule is the SI unit of energy.
What is a kilocalorie (kcal)?
A kilocalorie (food Calorie) equals 1,000 calories, used for diet and nutrition.
Where joule to kilocalorie conversion is used
Energy conversions are needed for electricity bills, food calories, heating, batteries and physics. Converting between joules and kilocalories is especially common when you compare products, read foreign specifications, or fill in forms that expect a specific unit.
Need every unit at once? Use the full Energy Converter.
Frequently asked questions
How many kilocalories are in 1 joule?
1 Joule equals 0.000239006 kcal.
How do I convert joules to kilocalories?
Multiply the number of joules by 0.0002390057. For example, 25 J × 0.0002390057 = 0.00597514 kcal.
What is 25 J in kcal?
25 J = 0.00597514 kcal.
How many joules are in 1 kilocalorie?
1 Kilocalorie equals 4,184 J. Use the Kcal to Joules converter for the reverse direction.
Is this Joule to Kilocalorie converter accurate?
Yes. It uses exact internationally defined conversion factors, calculated with full floating-point precision. Results are displayed rounded for readability.