Kilocalories to Joules Converter
Convert kilocalorie to joule instantly. Type a value below — the result updates as you type.
When you need to convert kilocalorie to joule
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 kcal is about 2092 J, and 5 kcal works out to roughly 20920 J. Because the ratio is fixed at 4184, you can scale any amount linearly — doubling the kilocalories doubles the joules.
Food packaging, power meters and heating equipment each prefer different energy units, so converting makes them directly comparable.
How to convert kilocalorie to joule
One kilocalorie equals 4184 joules. To convert, multiply the number of kilocalories by 4184:
joules = kilocalories × 4184
For example, 10 kilocalories × 4184 = 41840 joules.
Kilocalories to joules conversion table
| Energy (kcal) | Joules (J) |
|---|---|
| 1 kcal | 4184 J |
| 2 kcal | 8368 J |
| 3 kcal | 12552 J |
| 5 kcal | 20920 J |
| 10 kcal | 41840 J |
| 20 kcal | 83680 J |
| 50 kcal | 209200 J |
| 100 kcal | 418400 J |
FAQ
How many joules are in a kilocalorie?
One kilocalorie = 4184 joules.
How do I convert joules back to kilocalories?
Divide by 4184, or use the joules to kilocalories converter.