Energy converter
Energy shows up in many units, from kilowatt-hours on a power bill to calories on a food label to BTU on a heater. This converter switches between them. Homeowners, students and fitness fans use it to compare numbers on the same scale.
- Runs in your browser
- Free, no account needed
- Copy or download the result
Result
Example
1
1 kWh = 3600000 J
How to use the energy converter
- Type an amount of energy of zero or greater, such as 1.
- Choose the starting unit in From, such as Kilowatt-hours (kWh).
- Choose the target unit in To, such as Joules (J).
- Press Run to see the energy in the new unit, then use Copy result or Download.
How it works
Supported units: joules, kilojoules, watt-hours, kilowatt-hours, thermochemical calories, thermochemical kilocalories and International Table BTU.
One kilowatt-hour is 3,600,000 joules.
A thermochemical calorie is exactly 4.184 joules. The food Calorie on nutrition labels equals 1 kilocalorie.
One International Table BTU is about 1,055.06 joules.
Negative values are rejected. Power units like watts belong in the power converter.
Everything runs in your browser. Your input is not uploaded or stored.
Questions and answers
How many joules are in a kilowatt-hour?
One kilowatt-hour is exactly 3.6 million joules.
Is a food Calorie the same as a calorie?
No. A food Calorie, with a capital C, is 1,000 small calories, which is 1 kilocalorie or 4.184 kilojoules.
How many BTU are in a kWh?
One kilowatt-hour is about 3,412 International Table BTU.
What is the difference between kW and kWh?
A kW measures power, the rate of using energy. A kWh measures energy, such as 1 kW used for one hour.