How to convert kilocalories to joules
To convert kilocalories to joules, multiply the value by the conversion factor 4,184. To go the other way, multiply by 0.0002390057 (or divide by 4,184).
Worked example: 25 kcal to J
- Write the value: 25 kcal
- Multiply by 4,184: 25 × 4,184
- Result: 104,600 J
Kilocalorie to Joule conversion table
Quick reference values, rounded to 6 significant digits.
| Kilocalorie (kcal) | Joule (J) |
|---|---|
| 0.001 kcal | 4.184 J |
| 0.005 kcal | 20.92 J |
| 0.01 kcal | 41.84 J |
| 0.05 kcal | 209.2 J |
| 0.1 kcal | 418.4 J |
| 0.25 kcal | 1,046 J |
| 0.5 kcal | 2,092 J |
| 1 kcal | 4,184 J |
| 2 kcal | 8,368 J |
| 3 kcal | 12,552 J |
| 5 kcal | 20,920 J |
| 10 kcal | 41,840 J |
| 20 kcal | 83,680 J |
| 50 kcal | 209,200 J |
| 100 kcal | 418,400 J |
Joule to Kilocalorie
| J | kcal |
|---|---|
| 1 J | 0.000239006 kcal |
| 5 J | 0.00119503 kcal |
| 10 J | 0.00239006 kcal |
| 50 J | 0.0119503 kcal |
| 100 J | 0.0239006 kcal |
1 Kilocalorie in other energy units
About Kilocalorie and Joule
What is a kilocalorie (kcal)?
A kilocalorie (food Calorie) equals 1,000 calories, used for diet and nutrition.
What is a joule (J)?
The joule is the SI unit of energy.
Where kilocalorie to joule conversion is used
Energy conversions are needed for electricity bills, food calories, heating, batteries and physics. Converting between kilocalories and joules 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 joules are in 1 kilocalorie?
1 Kilocalorie equals 4,184 J.
How do I convert kilocalories to joules?
Multiply the number of kilocalories by 4,184. For example, 25 kcal × 4,184 = 104,600 J.
What is 25 kcal in J?
25 kcal = 104,600 J.
How many kilocalories are in 1 joule?
1 Joule equals 0.000239006 kcal. Use the Joules to Kcal converter for the reverse direction.
Is this Kilocalorie to Joule converter accurate?
Yes. It uses exact internationally defined conversion factors, calculated with full floating-point precision. Results are displayed rounded for readability.