Energy Converter
Convert energy between joules, kilojoules, calories, kilocalories (food calories), watt-hours, kilowatt-hours, and British thermal units (BTU). Energy appears on food labels, electricity bills, heating specs, and physics problems, each with its own favored unit, which makes comparison awkward. This converter translates between them using standard definitions, so you can see, for example, how the kilocalories on a nutrition label relate to kilojoules, or how a device rating in watt-hours compares to kilowatt-hours on your bill. Choose your from and to units, type a number, and the answer updates live as you type. All calculations happen locally in your browser, keeping the tool fast and private and letting it work offline once the page has loaded.
How to use Energy Converter
- Enter an energy value in the unit you have.
- Read the equivalent in every other energy unit.
- Copy the result you need.
Frequently asked questions
What energy units does it convert?
It converts between joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, and BTU.
Is a food Calorie the same as a calorie here?
A food Calorie is a kilocalorie, which equals 1000 small calories, and the tool lists both so you pick the right one.
Can I convert joules to calories?
Yes. Enter joules and the calories field updates using 1 calorie equals 4.184 joules.
What is Energy Converter?
Convert energy between joules, kilojoules, calories, kilocalories (food calories), watt-hours, kilowatt-hours, and British thermal units (BTU). Energy appears on food labels, electricity bills, heating specs, and physics problems, each with its own favored unit, which makes comparison awkward.
Is Energy Converter free to use?
Yes. Energy Converter is completely free, with no sign-up and no usage limits.
Does Energy Converter work in a web browser?
Yes. Energy Converter runs in any modern web browser. There is nothing to download or install.
Is my data private with Energy Converter?
Yes. Energy Converter runs entirely on your device in your browser, so nothing you enter is uploaded to a server.
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Link this tool from a README, doc or site. The badge links back to this page.
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