Convert Calories to Joules
One calorie equals 4.184 joules. Type any value to convert calories to joules instantly — with a full reference table below.
Convert Calories to Joules
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Conversion formula
To convert calories to joules, multiply by 4.184. One calorie equals 4.184 J, and one joule equals 0.239006 cal.
Calories to Joules table
About converting Calories to Joules
Calories (cal) and Joules (J) are both units of energy. The exact factor is 1 cal = 4.184 J, so multiply by 4.184 to go from calories to joules (or divide to go back).
The conversion is exact and runs entirely in your browser. Need the reverse? Use the Joules to Calories converter, or the full unit converter for every unit at once.
Frequently asked questions
How many joules are in one calorie?
One calorie equals 4.184 joules.
How do I convert calories to joules?
Multiply the number of calories by 4.184. For example, 10 calories = 41.84 joules.
What is 5 calories in joules?
5 calories is 20.92 joules.