Energy Converter
Convert between joules, calories, watt-hours and BTU.
Result
Results are estimates for general information only and are not professional advice.
Energy units
Energy appears in joules, calories, watt-hours and BTU depending on the field. This converter switches between all of them using standard factors — handy for physics, nutrition and household energy use.
Frequently Asked Questions
What is the Energy Converter?
Convert between joules, calories, watt-hours and BTU. It runs instantly in your browser and is completely free to use.
What do I need to enter to use the Energy Converter?
The Energy Converter asks for the following values (3): Value, From, To. Fill them in and the result appears immediately — the calculation runs on your own device, so nothing you type is sent to a server.
How accurate is the Energy Converter?
The Energy Converter uses standard, widely-accepted formulas, so its figures are reliable estimates for everyday planning. They are not a substitute for advice from a qualified professional.
Is the Energy Converter free, and do I need an account?
Yes. The Energy Converter — and every other calculator on Calculatis — is completely free, with no registration, no download and no limit on how often you use it.