How to use the Energy Converter
- Enter the value to convert.
- Choose the unit you have and the unit you want.
- Press Convert. The table below shows the value in every unit.
Formula
Every unit is defined by its exact size in joules. To convert, multiply by the “from” factor and divide by the “to” factor.
| Unit | In joules |
|---|---|
| Joule (J) | 1 |
| Kilojoule (kJ) | 1,000 |
| Megajoule (MJ) | 1,000,000 |
| Calorie (cal) | 4.184 |
| Kilocalorie (kcal / food Calorie) | 4,184 |
| Watt-hour (Wh) | 3,600 |
| Kilowatt-hour (kWh) | 3,600,000 |
| British thermal unit (BTU) | 1,055.05585262 |
| Therm (US) | 105,480,400 |
| Foot-pound (ft·lbf) | 1.3558179483 |
| Electronvolt (eV) | 1.602176634 × 10⁻¹⁹ |
Examples
- 1 kWh = 3.6 MJ = 860.42 kcal.
- 2,000 kcal = 8.37 MJ.
Frequently asked questions
What is a unit of electricity?
On electricity bills, one unit is one kilowatt-hour (kWh).