Energy Converter — Free Online Tool
Convert energy values between scientific (J, kJ, MJ, eV), food/nutrition (cal, kcal), electrical (Wh, kWh), imperial (BTU, ft·lb), and other units.
100% client-side. No uploads. Your data never leaves your browser.
How to use Energy Converter
- Enter a value.
- Select source and target units.
- See result instantly.
Frequently Asked Questions
How many joules in a calorie?
1 cal = 4.184 J. 1 kcal (food calorie) = 4,184 J.
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