Kilojoule to Kilocalorie Converter
One Kilojoule equals 0.2390057361 Kilocalorie (1 kJ = 0.2390057361 kcal). Multiply a Kilojoule value by 0.2390057361 to get the equivalent in Kilocalorie. Use the calculator above for instant results, or follow the formula, worked examples, and reference table below.
Formula
kcal = kJ × 0.2390057361
Multiply the Kilojoule value by 0.2390057361 to get the equivalent value in Kilocalorie.
Example Conversions
1 Kilojoule (kJ)
0.2390057361 Kilocalorie (kcal)
5 Kilojoule (kJ)
1.195028681 Kilocalorie (kcal)
10 Kilojoule (kJ)
2.390057361 Kilocalorie (kcal)
25 Kilojoule (kJ)
5.975143403 Kilocalorie (kcal)
100 Kilojoule (kJ)
23.90057361 Kilocalorie (kcal)
Conversion Table
| Kilojoule (kJ) | Kilocalorie (kcal) |
|---|---|
| 0.1 | 0.02390057361 |
| 0.5 | 0.1195028681 |
| 1 | 0.2390057361 |
| 2 | 0.4780114723 |
| 5 | 1.195028681 |
| 10 | 2.390057361 |
| 25 | 5.975143403 |
| 50 | 11.95028681 |
| 100 | 23.90057361 |
| 250 | 59.75143403 |
| 500 | 119.5028681 |
| 1000 | 239.0057361 |
How to Convert Manually
Use these steps to convert Kilojoule values to Kilocalorie without the calculator.
- Write down the value in Kilojoule (kJ) that you want to convert.
- Multiply that value by 0.2390057361.
- For example, 10 Kilojoule × 0.2390057361 = 2.390057361 Kilocalorie.
- Label the result as Kilocalorie (kcal).
Relative Size Comparison
This chart shows the visual difference in size between exactly one Kilojoule and one Kilocalorie.
About Kilojoule and Kilocalorie
The kilojoule is 1,000 joules. Food energy in Australia, Europe, and most metric countries is labeled in kilojoules alongside or instead of calories. The kilocalorie is 4,184 joules — the food 'Calorie' (capital C) on US nutrition labels. Diet tracking and exercise burn estimates use kilocalories. One Kilojoule equals 0.2390057361 Kilocalorie (1 kJ = 0.2390057361 kcal). Kilojoule to Kilocalorie conversion comes up most often in food labels outside the US and in exercise energy expenditure, typically when figures need restating for nutrition labels and diet tracking.
Precision and Rounding: Energy factors mix exact definitions (1 kWh = 3,600,000 J; 1 cal = 4.184 J thermochemical) with measured conventions (1 BTU ≈ 1,055.056 J). Nutrition and utility bills round to whole units; engineering heat calculations should keep the full factor until the final step.
Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).
Worked Example
15 Kilojoule equals 3.585086042 Kilocalorie.
15 kJ × 0.2390057361 = 3.585086042 kcal
FAQ
How do I convert Kilojoule to Kilocalorie?
Multiply the Kilojoule value by 0.2390057361 to get the equivalent value in Kilocalorie.
What is the formula for Kilojoule to Kilocalorie?
The formula is kcal = kJ × 0.2390057361.
How many Kilocalorie are in 1 Kilojoule?
1 Kilojoule equals 0.2390057361 Kilocalorie.
Can I convert Kilocalorie back to Kilojoule?
Yes. 1 Kilocalorie equals 4.184 Kilojoule, and the related converter can reverse the calculation.
What are common names for Kilojoule and Kilocalorie?
Kilojoule is shown as kJ and may also be searched as kilojoule, kilojoules. Kilocalorie is shown as kcal and may also be searched as kilocalorie, kilocalories, food calorie.
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