Joules to Kilocalories Converter
One Joule equals 0.0002390057361 Kilocalories (1 J = 0.0002390057361 kcal). Multiply a Joule value by 0.0002390057361 to get the equivalent in Kilocalories. Use the calculator above for your value, or check the examples and reference table below.
Formula
kcal = J × 0.0002390057361
Multiply the Joule value by 0.0002390057361 to get the equivalent value in Kilocalories.
Example Conversions
1 Joule (J)
0.0002390057361 Kilocalorie (kcal)
5 Joule (J)
0.001195028681 Kilocalorie (kcal)
10 Joule (J)
0.002390057361 Kilocalorie (kcal)
25 Joule (J)
0.005975143403 Kilocalorie (kcal)
100 Joule (J)
0.02390057361 Kilocalorie (kcal)
Conversion Table
| Joule (J) | Kilocalorie (kcal) |
|---|---|
| 0.1 | 0.00002390057361 |
| 0.5 | 0.0001195028681 |
| 1 | 0.0002390057361 |
| 2 | 0.0004780114723 |
| 5 | 0.001195028681 |
| 10 | 0.002390057361 |
| 25 | 0.005975143403 |
| 50 | 0.01195028681 |
| 100 | 0.02390057361 |
| 250 | 0.05975143403 |
| 500 | 0.1195028681 |
| 1000 | 0.2390057361 |
How to Convert Manually
Use these steps to convert Joule values to Kilocalorie without the calculator.
- Write down the value in Joule (J) that you want to convert.
- Multiply that value by 0.0002390057361.
- For example, 10 Joules × 0.0002390057361 = 0.002390057361 Kilocalories.
- Label the result as Kilocalorie (kcal).
Relative Size Comparison
This chart shows the visual difference in size between exactly one Joule and one Kilocalorie.
About Joule and Kilocalorie
The joule is the SI derived unit of energy, the work done by a force of one newton over one meter. Physics, chemistry, and food labeling outside the US build on it. The kilocalorie is 4,184 joules. It is the food 'Calorie' (capital C) on US nutrition labels. Diet tracking and exercise burn estimates use kilocalories. One Joule equals 0.0002390057361 Kilocalories (1 J = 0.0002390057361 kcal). Joule is used in physics and engineering calculations and in food energy labeling outside the US. Kilocalorie is used in 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
15Joules equals0.003585086042Kilocalories.
15 J × 0.0002390057361 = 0.003585086042 kcal
FAQ
How do I convert Joule to Kilocalorie?
Multiply the Joule value by 0.0002390057361 to get the equivalent value in Kilocalories.
What is the formula for Joule to Kilocalorie?
The formula is kcal = J × 0.0002390057361.
How many Kilocalories are in 1 Joule?
1 Joule equals 0.0002390057361 Kilocalories.
Can I convert Kilocalorie back to Joule?
Yes. 1 Kilocalorie equals 4184 Joules, and the related converter can reverse the calculation.
What are common names for Joule and Kilocalorie?
Joule is shown as J and may also be searched as joule, joules. Kilocalorie is shown as kcal and may also be searched as kilocalorie, kilocalories, food calorie.
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