Energy Converter
Convert energy between joules, kilojoules, watt-hours, kilowatt-hours, calories, kilocalories, BTU, foot-pounds, and electronvolts.
Independently verified for accuracy
Calculator by Toolsloft ↗- Result
- 3.6 Megajoules (MJ)
- Conversion
- 1 Kilowatt-hours (kWh) = 3.6 Megajoules (MJ)
Convert energy from one unit to another, whether you are reading a utility bill in kilowatt-hours, a food label in kilocalories, or a heating spec in BTU. Pick the two units, enter a value, and the result updates as you type.
How this is calculated
Every value routes through the joule, the SI unit of energy. One watt-hour is 3600 joules, one thermochemical calorie is exactly 4.184 joules (so a kilocalorie is 4184 joules), and one IT British thermal unit is 1055.05585262 joules. Converting means scaling the input to joules and back out to the target unit.
How to use
- Enter the amount of energy.
- Choose the unit you have and the unit you want.
- Read the converted value, or press Swap to reverse the direction.
Examples
- Kilowatt-hour to megajoule:
1 kWh = 3.6 MJ - Food kilocalories to kilojoules:
100 kcal = 418.4 kJ - BTU to joules:
1 BTU = 1055.055853 J
FAQ
- How many joules are in a kilowatt-hour?
- One kilowatt-hour is 3,600,000 joules, which is 3.6 megajoules. That is one kilowatt of power sustained for one hour.
- Is a food Calorie the same as a calorie here?
- A food Calorie with a capital C is a kilocalorie. Choose kilocalories (kcal) for nutrition labels and calories (cal) for the smaller physics unit.