Energy Converter
Convert between joules, calories, kWh, and BTU.
Free · No sign-up · Works in your browser
Joule (J)
1
Kilojoule (kJ)
0.001
Calorie (cal)
0.239006
Kilocalorie (kcal)
0.000239
Watt-hour (Wh)
0.000278
Kilowatt-hour (kWh)
0
BTU
0.000948
Foot-pound (ft·lb)
0.737561
About the Energy Converter
Free energy converter — convert between joules, kilojoules, calories, kilocalories, watt-hours, kWh, BTU, and foot-pounds.
How to use the Energy Converter
- 1Enter a value.
- 2Pick the unit to convert from.
- 3Read every other unit and copy.
Frequently asked questions
How many joules in a calorie?
1 calorie = 4.184 joules; 1 kcal (food calorie) = 4,184 joules.
What is a kWh in joules?
1 kWh = 3,600,000 joules (3.6 MJ).