Energy Converter
Convert energy between physics units (joules, kJ), food energy (calories and kilocalories), electricity (Wh, kWh) and heating (BTU).
Your numbers
Result
| Unit | Value |
|---|---|
| J | 418,400 |
| kJ | 418.4 |
| cal | 100,000 |
| kcal (Cal) | 100 |
| Wh | 116.22 |
| kWh | 0.12 |
| BTU | 396.57 |
The key conversions
One kilocalorie — the "Calorie" on food labels — is 4.184 kJ, so a 100 kcal snack holds about 418 kJ. One kWh is 3.6 million joules (3,600 kJ). One BTU is about 1.055 kJ, the heat to warm a pound of water by 1 °F.
Calorie vs Calorie
A food Calorie (capital C) is actually a kilocalorie — 1,000 small calories. This converter lists both cal and kcal so you can match nutrition labels (kcal) or physics problems (cal) without confusion.
Frequently asked questions
Sources
- International System of Units — energy (joule)
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