Energy ConverterFree online energy converter
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Convert joules, kilojoules, calories, kilocalories and kilowatt-hours in seconds.
This free energy converter helps you convert popular units like joules to calories, calories to joules, kJ to kcal and kWh to joules in seconds. It supports joules, kilojoules, calories, kilocalories and kilowatt-hours, making it useful for science, nutrition, electricity and everyday energy conversions.
This energy converter supports joules, kilojoules, calories, kilocalories and kilowatt-hours. You can convert in any direction, such as joules to calories , calories to joules , kJ to kcal and kWh to joules .
To convert joules to calories , divide joules by 4.184 . This tool calculates it instantly and also works for kilojoules, kilocalories and kilowatt-hours.
To convert kilowatt-hours to joules , multiply kilowatt-hours by 3,600,000 . You can also use the Swap button to reverse the conversion direction instantly.
A kilocalorie equals 1000 small calories . In food labels, the word “calorie” often actually refers to kilocalories , which is why this converter includes both units.
One kilowatt-hour equals exactly 3,600,000 joules, because a watt is one joule per second and an hour contains 3,600 seconds.
Energy is the amount transferred or used, measured in units such as joules and kilowatt-hours. Power is the rate of energy transfer, measured in watts. A power reading needs a time interval to determine energy used.
