Energy Converter
Convert instantly between joule, kilojoule, calorie, kilocalorie, watt-hour, kilowatt-hour (kWh) and BTU. Handy for nutrition, electricity and heat calculations.
All conversions — 1 kWh
Watt-hour (Wh)1,000
Kilojoule (kJ)3,600
Joule (J)3,600,000
Kilocalorie (kcal)860.4207
Calorie (cal)860,420.6501
BTU (BTU)3,412.1416
About
The energy converter handles units from food calories to the kWh on your electricity bill and the BTU in heating calculations. In nutrition, a 'calorie' is usually actually a kilocalorie (kcal).
1 kcal = 4184 J and 1 kWh = 3,600,000 J. The calculation runs instantly in your browser; your data is never sent out.
How to use
- Enter the energy value you want to convert.
- Pick the source unit (e.g. kilocalorie) and the target unit (e.g. kilojoule).
- The result and all unit equivalents are listed instantly.
Frequently Asked Questions
- How many kJ is 1 kcal?
- 1 kilocalorie (kcal) is about 4.184 kJ.
- How many joules is 1 kWh?
- 1 kWh = 3,600,000 joules (3.6 MJ).