How to convert joules to calories
To convert joules to calories, multiply the value by the conversion factor 0.2390057361. To go the other way, multiply by 4.184 (or divide by 0.2390057361).
Worked example: 25 J to cal
- Write the value: 25 J
- Multiply by 0.2390057361: 25 × 0.2390057361
- Result: 5.97514 cal
Joule to Calorie conversion table
Quick reference values, rounded to 6 significant digits.
| Joule (J) | Calorie (cal) |
|---|---|
| 0.1 J | 0.0239006 cal |
| 0.25 J | 0.0597514 cal |
| 0.5 J | 0.119503 cal |
| 1 J | 0.239006 cal |
| 2 J | 0.478011 cal |
| 3 J | 0.717017 cal |
| 4 J | 0.956023 cal |
| 5 J | 1.19503 cal |
| 6 J | 1.43403 cal |
| 7 J | 1.67304 cal |
| 8 J | 1.91205 cal |
| 9 J | 2.15105 cal |
| 10 J | 2.39006 cal |
| 12 J | 2.86807 cal |
| 15 J | 3.58509 cal |
| 20 J | 4.78011 cal |
| 25 J | 5.97514 cal |
| 30 J | 7.17017 cal |
| 40 J | 9.56023 cal |
| 50 J | 11.9503 cal |
| 75 J | 17.9254 cal |
| 100 J | 23.9006 cal |
| 250 J | 59.7514 cal |
| 500 J | 119.503 cal |
| 1,000 J | 239.006 cal |
Calorie to Joule
| cal | J |
|---|---|
| 1 cal | 4.184 J |
| 5 cal | 20.92 J |
| 10 cal | 41.84 J |
| 50 cal | 209.2 J |
| 100 cal | 418.4 J |
1 Joule in other energy units
About Joule and Calorie
What is a joule (J)?
The joule is the SI unit of energy.
What is a calorie (cal)?
A small calorie is the energy to raise 1 g of water by 1 °C (4.184 J).
Where joule to calorie conversion is used
Energy conversions are needed for electricity bills, food calories, heating, batteries and physics. Converting between joules and calories 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 calories are in 1 joule?
1 Joule equals 0.239006 cal.
How do I convert joules to calories?
Multiply the number of joules by 0.2390057361. For example, 25 J × 0.2390057361 = 5.97514 cal.
What is 25 J in cal?
25 J = 5.97514 cal.
How many joules are in 1 calorie?
1 Calorie equals 4.184 J. Use the Calories to Joules converter for the reverse direction.
Is this Joule to Calorie converter accurate?
Yes. It uses exact internationally defined conversion factors, calculated with full floating-point precision. Results are displayed rounded for readability.