Energy Converter
Food, electricity and heat.
Runs on your device
At a glance
- Processing:
- Runs locally in your browser
- Privacy:
- Your files stay on your device — nothing is uploaded to a server
About this tool
Convert J, kJ, cal, kcal, Wh, kWh, BTU and eV-scale values. Compare food labels, electricity bills and heating specs on one page.
How to use it
- Type the energy value.
- Choose from/to units.
- Read equivalents instantly.
Frequently asked questions
How do I convert energy values?
Enter a value, pick the source and target units, and read the result instantly. For example: 1 kWh = 3.6 MJ. All math runs locally in your browser.
Is my data uploaded or stored?
No. Unit conversion is pure arithmetic in your browser — nothing is sent, uploaded or stored.
How precise are the results?
Conversions use double-precision factors and display up to 6 significant decimals with trailing zeros stripped, so everyday and technical values both stay accurate.