Energy Converter
Convert between joules, calories, kWh, BTU. For physics, nutrition, and utilities.
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Use Energy Converter Online Free
This free online energy converter runs in your browser. No installation, no signup. Paste your input above and get instant results. Works on desktop and mobile.
How Energy Converter Works
Paste or enter your input in the field above. Most tools update in real time. Click the Copy button to copy the output. All processing happens in your browser—your data never leaves your device unless the tool explicitly uses a server feature (such as URL shortening or bcrypt hashing).
This tool is part of the Unit Converters category. Check similar tools below. All everytools are free, no signup required. Works on desktop and mobile.
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Frequently Asked Questions
- How many joules in a calorie?
- 1 calorie ≈ 4.18 joules. Food calories (kcal) = 1000 cal = 4184 J.
- What is BTU?
- British Thermal Unit. 1 BTU ≈ 1055 J. Often used for heating and cooling.