Energy Converter
Convert between Joules, Calories, Watt-hours, and BTUs.
Enter a value to see the conversion result
Understanding Energy Conversion
Energy measures the capacity to do work or produce heat. The joule is the SI unit, while calories are used in nutrition, and kilowatt-hours measure electrical energy consumption.
| Unit Type | Unit Name | Value in Joules (J) |
|---|---|---|
| Metric | Joule (J) | 1 J |
| Metric | Kilojoule (kJ) | 1,000 J |
| Metric | Megajoule (MJ) | 1,000,000 J |
| Nutrition | Calorie (cal) | 4.184 J |
| Nutrition | Kilocalorie (kcal) | 4,184 J |
| Electrical | Watt-hour (Wh) | 3,600 J |
| Electrical | Kilowatt-hour (kWh) | 3,600,000 J |
| Imperial | BTU | 1,055.06 J |
| Physics | Electron Volt (eV) | 1.602×10⁻¹⁹ J |
Conversion Tip
Energy measures the capacity to do work. The joule is the SI unit, while calories and kilowatt-hours are common in nutrition and electricity.
Quick Reference
- 1 kilojoule = 1,000 joules
- 1 calorie = 4.184 joules
- 1 kilocalorie (kcal) = 4,184 joules
- 1 kilowatt-hour = 3.6 megajoules
- 1 BTU = 1,055.06 joules
- 1 electron volt = 1.602×10⁻¹⁹ joules
- 1 watt-hour = 3,600 joules
- 1 food calorie = 1 kilocalorie
Copied!