Unit Converter Express Version🧮
⚡ Energy Converter
Convert between 9 energy units instantly
Pick a unit on each side of the converter above and type a value — the result appears as you type. Everything runs in your browser, so nothing is sent anywhere.
Energy units measure work and heat across very different fields: joules in physics, calories and kilocalories in nutrition, kilowatt-hours on electricity bills, and BTU in heating and air conditioning. One food 'Calorie' (capital C) is actually a kilocalorie — 1,000 small calories, or about 4,184 joules. One kilowatt-hour is 3.6 million joules.
Energy units supported
| Unit | Symbol |
|---|---|
| Joule | J |
| Kilojoule | kJ |
| Calorie | cal |
| Kilocalorie | kcal |
| Watt-hour | Wh |
| Kilowatt-hour | kWh |
| Electronvolt | eV |
| BTU | BTU |
| Foot-pound | ft·lb |
All converter categories
Find the Units to Convert
Type a unit name (e.g. kilogram, mile, celsius) — the matching converter loads automatically.