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.
Is the Energy Converter free and does it require signup?
Yes. Every calculator on Calculatis is 100% free with no registration, and the values you enter are never stored.
How accurate is the Energy Converter?
It uses standard, widely-accepted formulas. Results are reliable estimates for general use and are not a substitute for professional advice.