Conversions
Energy Converter
Joules, calories, kWh and BTU in instant conversion.
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Conversion to all units
joule (J)3,600,000
kilojoule (kJ)3,600
calorie (cal)860,420.650096
kilocalorie (kcal)860.42065
watt-hour (Wh)1,000
kilowatt-hour (kWh)1
BTU3,412.141642
electronvolt (eV)22,469,432,668,058,746,000,000,000
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.