Energy converter
Convert energy units with explicit calorie definitions.
Energy converter
Your result appears here
Adjust the values to see your result automatically.
How to use Energy converter
The Energy converter takes an amount of energy and returns it in another unit, including joules, kilojoules, megajoules, watt-hours, kilowatt-hours, thermochemical calories and kilocalories, and IT British thermal units. A kilowatt-hour is 3,600,000 joules, a thermochemical calorie is 4.184 joules, and one BTU (IT) is 1,055.05585262 joules.
- Adjust the values; an initial result is calculated from the defaults.
- Change the basic settings or open Advanced mode to fine-tune the result.
- Review and copy or download your result. Pause Live results to run manually. Sources or individual settings above 20,000 characters require an explicit run.
What this tool supports
Convert energy units with explicit calorie definitions.
- Value
- Set this value for your task.
- From
- J · kJ · MJ · Wh · kWh · cal (thermochemical) · kcal (thermochemical) · BTU (IT)
- To
- J · kJ · MJ · Wh · kWh · cal (thermochemical) · kcal (thermochemical) · BTU (IT)
- Significant digits
- Range: 1 to 15
- Number display
- Standard (grouped) · Plain (no grouping) · Scientific notation
Limits and processing
Use finite numbers, valid dates and the ranges shown by each control. Invalid values produce an error without a downloadable result.
Frequently asked questions
How many joules are in a kilowatt-hour?
A kilowatt-hour is 3,600,000 joules, because one watt for one hour is 3,600 joules and a kilowatt is 1,000 watts. A watt-hour is 3,600 joules.
Which calorie does this converter use?
It uses the thermochemical calorie of exactly 4.184 joules, and the kilocalorie of 4,184 joules. Food labels usually list kilocalories, so 1 kcal from a label converts to 4.184 kJ here.
How many BTU are in a kWh?
The converter uses the International Table BTU of 1,055.05585262 joules. Dividing 3,600,000 joules by that value gives about 3,412.14 BTU per kilowatt-hour.
Where is my input processed?
This operation processes its source in your browser. Copy and download are explicit actions; source input is not saved in an account or history.
What are the input limits?
Use finite numbers, valid dates and the ranges shown by each control. Invalid values produce an error without a downloadable result.