Joules to Calories Converter
Convert joule to calorie instantly. Type a value below — the result updates as you type.
When you need to convert joule to calorie
Energy conversions appear on nutrition labels, utility bills and appliance specs, letting you compare food energy, electricity use and heating output on a common scale.
Typical values: 0.5 J is about 0.1195 cal, and 100 J works out to roughly 23.9006 cal. Because the ratio is fixed at 0.239, you can scale any amount linearly — doubling the joules doubles the calories.
Food packaging, power meters and heating equipment each prefer different energy units, so converting makes them directly comparable.
How to convert joule to calorie
One joule equals 0.239 calories. To convert, multiply the number of joules by 0.239:
calories = joules × 0.239
For example, 10 joules × 0.239 = 2.3901 calories.
Joules to calories conversion table
| Energy (J) | Calories (cal) |
|---|---|
| 1 J | 0.239 cal |
| 2 J | 0.478 cal |
| 3 J | 0.717 cal |
| 5 J | 1.195 cal |
| 10 J | 2.3901 cal |
| 20 J | 4.7801 cal |
| 50 J | 11.9503 cal |
| 100 J | 23.9006 cal |
FAQ
How many calories are in a joule?
One joule = 0.239 calories.
How do I convert calories back to joules?
Divide by 0.239, or use the calories to joules converter.