Energy Converter
Joules, calories, kWh and BTU in instant conversion.
Conversion to all units
How it works
Convert energy units between joules, calories, watt-hours and BTU.
Supported units: J, kJ, cal, kcal, Wh, kWh, BTU, eV. Type any value and see the conversion to every unit in real time.
Practical examples
1 kWh in kcal
1 kWh ≈ 860.42 kcal
1 BTU in J
1 BTU ≈ 1055.06 J
Frequently asked questions
Are the conversions exact?
We use official SI conversion factors. Results are rounded to up to 6 decimal places.
Does it work offline?
Yes — everything runs in your browser, no data is sent to servers.
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⚠️ Disclaimer
This calculator is for educational and informational purposes only. Results are estimates based on public formulas and may contain inaccuracies or be outdated. We are not accountants, lawyers, doctors, or financial advisors — for any important decision (tax filings, contracts, diagnoses, financial planning), always consult a qualified professional. calculadora.work assumes no liability for decisions made based on the content of this site.