Joules to Calories Converter
One Joule equals 0.2390057361 Calories (1 J = 0.2390057361 cal). Multiply a Joule value by 0.2390057361 to get the equivalent in Calories. Enter your value in the calculator above. The formula and examples below show how to calculate it by hand.
Formula
cal = J × 0.2390057361
Multiply the Joule value by 0.2390057361 to get the equivalent value in Calories.
Example Conversions
1 Joule (J)
0.2390057361 Calorie (cal)
5 Joule (J)
1.195028681 Calorie (cal)
10 Joule (J)
2.390057361 Calorie (cal)
25 Joule (J)
5.975143403 Calorie (cal)
100 Joule (J)
23.90057361 Calorie (cal)
Conversion Table
| Joule (J) | Calorie (cal) |
|---|---|
| 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 Joule values to Calorie without the calculator.
- Write down the value in Joule (J) that you want to convert.
- Multiply that value by 0.2390057361.
- For example, 10 Joules × 0.2390057361 = 2.390057361 Calories.
- Label the result as Calorie (cal).
Relative Size Comparison
This chart shows the visual difference in size between exactly one Joule and one Calorie.
About Joule and Calorie
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 calorie (small calorie) is exactly 4.184 joules under the thermochemical convention. It originally described the heat to warm one gram of water by 1 °C. Chemistry uses it; food 'Calories' are actually kilocalories. One Joule equals 0.2390057361 Calories (1 J = 0.2390057361 cal). Joule is used in physics and engineering calculations and in food energy labeling outside the US. Calorie is used in chemistry heat calculations.
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 equals3.585086042Calories.
15 J × 0.2390057361 = 3.585086042 cal
FAQ
How do I convert Joule to Calorie?
Multiply the Joule value by 0.2390057361 to get the equivalent value in Calories.
What is the formula for Joule to Calorie?
The formula is cal = J × 0.2390057361.
How many Calories are in 1 Joule?
1 Joule equals 0.2390057361 Calories.
Can I convert Calorie back to Joule?
Yes. 1 Calorie equals 4.184 Joules, and the related converter can reverse the calculation.
What are common names for Joule and Calorie?
Joule is shown as J and may also be searched as joule, joules. Calorie is shown as cal and may also be searched as calorie, calories, small calorie.
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