Joules to Calories Converter
1 joule = 0.239006 calories.
Enter a value
Result
1 joule =
0.239006 cal
1 J × 0.239006 = 0.239006 cal
1 kcal = 4.184 kJ · 1 kWh = 3,600 kJ
The working
- 1. Convert 1 J to joules: 1 × 1 = 1.
- 2. Convert to cal: 1 ÷ 4.184 = 0.239006.
1 J in every unit
Everyday energy
- A banana
- ≈ 400 kJ (95 kcal)
- Boiling a kettle
- ≈ 0.1 kWh
- A litre of petrol
- ≈ 34 MJ
Conversion table
Joules to Calories
| Joules | Calories |
|---|---|
| 1 | 0.23901 |
| 2 | 0.47801 |
| 3 | 0.71702 |
| 4 | 0.95602 |
| 5 | 1.195 |
| 6 | 1.434 |
| 7 | 1.673 |
| 8 | 1.912 |
| 9 | 2.1511 |
| 10 | 2.3901 |
| 15 | 3.5851 |
| 20 | 4.7801 |
| 25 | 5.9751 |
| 50 | 11.95 |
| 100 | 23.901 |
Calories to Joules
| Calories | Joules |
|---|---|
| 1 | 4.184 |
| 2 | 8.368 |
| 3 | 12.552 |
| 4 | 16.736 |
| 5 | 20.92 |
| 6 | 25.104 |
| 7 | 29.288 |
| 8 | 33.472 |
| 9 | 37.656 |
| 10 | 41.84 |
| 15 | 62.76 |
| 20 | 83.68 |
| 25 | 104.6 |
| 50 | 209.2 |
| 100 | 418.4 |
Formula and worked example
calories = joules × 0.2390057361.
Convert 1,000 joules to calories: 1,000 × 0.23900574 = 239.006 cal.
When you need this
Physics and chemistry problems mix joules and calories. Note that a food Calorie is a kilocalorie (1,000 calories).
Questions people ask
How many calories are in a joule?
One joule is 0.23900574 calories.
How do I convert joules to calories?
Multiply the number of joules by 0.23900574, or divide by 4.184.
What is 10 J in cal?
10 joules is 2.39006 calories.
How do I convert calories back to joules?
Multiply by 4.184: one calorie is 4.184 joules.
Related conversions
How we calculate this
We use the standard published formula or definition for this calculation, and we show the working so you can check it. Source: NIST Special Publication 811, Guide for the Use of the International System of Units.
Spotted a mistake? Tell us and we'll check it. How we check our calculators