Converters
Energy Converter
Convert between energy units — joules, kilojoules, calories, kilocalories and kilowatt-hours.
1 kcal equals
4.184 kJ
How it works
Enter an amount of energy, pick the units and read the result instantly. Handy for nutrition (calories to kilojoules) and electricity usage (kilowatt-hours).
Common conversions
1 kilocalorie = 4.184 kilojoules, and 1 kilowatt-hour = 3,600 kilojoules = 3.6 million joules.
Frequently Asked Questions
Yes. The “calories” on food labels are actually kilocalories (kcal). Use the kilocalorie unit for nutrition figures.