How to convert kilocalories to kilojoules
To convert kilocalories to kilojoules, multiply the value by the conversion factor 4.184. To go the other way, multiply by 0.2390057361 (or divide by 4.184).
Worked example: 25 kcal to kJ
- Write the value: 25 kcal
- Multiply by 4.184: 25 × 4.184
- Result: 104.6 kJ
Kilocalorie to Kilojoule conversion table
Quick reference values, rounded to 6 significant digits.
| Kilocalorie (kcal) | Kilojoule (kJ) |
|---|---|
| 0.1 kcal | 0.4184 kJ |
| 0.25 kcal | 1.046 kJ |
| 0.5 kcal | 2.092 kJ |
| 1 kcal | 4.184 kJ |
| 2 kcal | 8.368 kJ |
| 3 kcal | 12.552 kJ |
| 4 kcal | 16.736 kJ |
| 5 kcal | 20.92 kJ |
| 6 kcal | 25.104 kJ |
| 7 kcal | 29.288 kJ |
| 8 kcal | 33.472 kJ |
| 9 kcal | 37.656 kJ |
| 10 kcal | 41.84 kJ |
| 12 kcal | 50.208 kJ |
| 15 kcal | 62.76 kJ |
| 20 kcal | 83.68 kJ |
| 25 kcal | 104.6 kJ |
| 30 kcal | 125.52 kJ |
| 40 kcal | 167.36 kJ |
| 50 kcal | 209.2 kJ |
| 75 kcal | 313.8 kJ |
| 100 kcal | 418.4 kJ |
| 250 kcal | 1,046 kJ |
| 500 kcal | 2,092 kJ |
| 1,000 kcal | 4,184 kJ |
Kilojoule to Kilocalorie
| kJ | kcal |
|---|---|
| 1 kJ | 0.239006 kcal |
| 5 kJ | 1.19503 kcal |
| 10 kJ | 2.39006 kcal |
| 50 kJ | 11.9503 kcal |
| 100 kJ | 23.9006 kcal |
1 Kilocalorie in other energy units
About Kilocalorie and Kilojoule
What is a kilocalorie (kcal)?
A kilocalorie (food Calorie) equals 1,000 calories, used for diet and nutrition.
What is a kilojoule (kJ)?
A kilojoule equals 1,000 joules, used on food labels.
Where kilocalorie to kilojoule conversion is used
Energy conversions are needed for electricity bills, food calories, heating, batteries and physics. Converting between kilocalories and kilojoules 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 kilojoules are in 1 kilocalorie?
1 Kilocalorie equals 4.184 kJ.
How do I convert kilocalories to kilojoules?
Multiply the number of kilocalories by 4.184. For example, 25 kcal × 4.184 = 104.6 kJ.
What is 25 kcal in kJ?
25 kcal = 104.6 kJ.
How many kilocalories are in 1 kilojoule?
1 Kilojoule equals 0.239006 kcal. Use the kJ to Kcal converter for the reverse direction.
Is this Kilocalorie to Kilojoule converter accurate?
Yes. It uses exact internationally defined conversion factors, calculated with full floating-point precision. Results are displayed rounded for readability.