Joules to Kilocalories Converter
Convert joule to kilocalorie instantly. Type a value below — the result updates as you type.
When you need to convert joule to kilocalorie
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 0.000119503 kcal, and 100 J works out to roughly 0.0239 kcal. Because the ratio is fixed at 0.000239006, you can scale any amount linearly — doubling the joules doubles the kilocalories.
Food packaging, power meters and heating equipment each prefer different energy units, so converting makes them directly comparable.
How to convert joule to kilocalorie
One joule equals 0.000239006 kilocalories. To convert, multiply the number of joules by 0.000239006:
kilocalories = joules × 0.000239006
For example, 10 joules × 0.000239006 = 0.0024 kilocalories.
Joules to kilocalories conversion table
| Energy (J) | Kilocalories (kcal) |
|---|---|
| 1 J | 0.000239006 kcal |
| 2 J | 0.000478011 kcal |
| 3 J | 0.000717017 kcal |
| 5 J | 0.0012 kcal |
| 10 J | 0.0024 kcal |
| 20 J | 0.0048 kcal |
| 50 J | 0.012 kcal |
| 100 J | 0.0239 kcal |
FAQ
How many kilocalories are in a joule?
One joule = 0.000239006 kilocalories.
How do I convert kilocalories back to joules?
Divide by 0.000239006, or use the kilocalories to joules converter.