Energy Converter
Convert energy between joules, calories, kilocalories, kWh, eV, and BTU.
- Joule (J)1,000
- Calorie (cal)239.005736
- Kilocalorie (kcal)0.239006
- Kilowatt-hour (kWh)0.000278
- Electronvolt (eV)6,241,509,074,460,763,000,000
- British thermal unit (BTU)0.947817
Enter a value and its unit to instantly convert it into every other energy unit, from joules to electronvolts.
How to use
- Enter the energy value you want to convert.
- Select the unit that value is in.
- Read the equivalent in every other unit below.
Frequently asked questions
- How many joules are in a calorie?
- One calorie equals 4.184 joules, and one kilocalorie (food Calorie) equals 4184 joules.
- What is an electronvolt?
- An electronvolt (eV) is a tiny energy unit used in physics, equal to about 1.602 × 10⁻¹⁹ joules.