Joule to Calorie
1 J = 0.2390057361 cal
How to convert joule to calorie
Enter the value in joule (J) above and the equivalent in calorie (cal) updates as you type. This conversion comes up when understanding electricity bills (kWh) versus heater labels (BTU).
Typical situations: comparing food energy: calories vs kilojoules on imported packaging; sizing power banks and EV batteries (Wh, kWh).
You can also convert in the other direction: Calorie to Joule
Joule to Calorie conversion table
| Joule (J) | Calorie (cal) |
|---|---|
| 1 | 0.239006 |
| 2 | 0.478011 |
| 5 | 1.195029 |
| 10 | 2.390057 |
| 25 | 5.975143 |
| 50 | 11.950287 |
| 100 | 23.900574 |
Watch out for
- Calorie (food) vs calorie (physics): food labels mean kilocalories, a factor of 1,000
- Power (kW) vs energy (kWh): a 5 kW heater running 2 hours uses 10 kWh
Frequently asked questions
How many calories is 1 joule?
1 joule = 0.239006 calories.
What is the formula to convert joule to calories?
The formula is: cal = J × 0.239006.
What is 10 joules in calories?
10 joules = 2.390057 calories.