Energy Converter
Convert energy between joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, and BTU.
Energy Converter
Very small or large results use scientific notation: 1E-9 means 0.000000001.
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What This Converter Does
Energy is the capacity to do work or produce heat, measured in joules. The same amount of energy can be written many ways - a food calorie (kcal) is about 4,184 joules, and a kilowatt-hour is energy measured by how much power runs for an hour.
Convert energy between joules (J), kilojoules (kJ), calories (cal), kilocalories (kcal), watt-hours (Wh), kilowatt-hours (kWh), and British thermal units (BTU).
How to Use It
- Enter the value.
- Choose the unit to convert from and to.
- Read the converted energy.
Worked Examples
| From | To | Result |
|---|---|---|
| 1 kWh | kJ | 3600 |
| 1 kcal | J | 4184 |
| 1 BTU | J | 1055.06 |
| 1 kWh | kcal | 860.42 |
FAQ
How many joules are in a calorie?
4.184 joules (a food Calorie is a kilocalorie, or 4184 joules).
How many kilojoules are in a kilowatt-hour?
3600 kJ.