Convert calories to joules

1 calorie equals 4.184 joules. To convert calories to joules, multiply the number of calories by 4.184: for example, 10 cal is 41.84 J. Ethical Tube's free calories to joules converter does the math as you type, and the chart below lists common values.

FromTo

1 cal = 4.184 J

1 cal: 4.184 J
1 J: 0.239006 cal
Formula: J = cal × 4.184
Measures: Energy
Price: Free
Works offline: Yes

Conversion chart

calories to joules chart

Calories (cal)	Joules (J)
1 cal	4.184 J
2 cal	8.368 J
3 cal	12.552 J
4 cal	16.736 J
5 cal	20.92 J
6 cal	25.104 J
8 cal	33.472 J
10 cal	41.84 J
12 cal	50.208 J
15 cal	62.76 J
20 cal	83.68 J
25 cal	104.6 J
50 cal	209.2 J
100 cal	418.4 J

How it works

How to convert calories to joules

Know the formula
J = cal × 4.184. In words: multiply the number of calories by 4.184.
Work an example
10 cal → 41.84 J. Round to two or three decimal places for everyday use.
Or type it in
Enter any value in the converter above and the answer appears instantly, in both directions.

Good to know

About energy units

Food labels use kilocalories (kcal), often written as Calories with a capital C. 1 kcal is 1,000 calories, or 4.184 kilojoules.
This converter uses the thermochemical calorie (4.184 joules) and the international BTU (1,055.06 joules).

FAQ

Questions, answered

How many joules are in a calorie?

There are 4.184 joules in 1 calorie. To convert calories to joules, multiply the number of calories by 4.184.

What is 10 calories in joules?

10 calories is 41.84 joules.

How do you convert joules back to calories?

Multiply the number of joules by 0.239006. 1 joule is 0.239006 calories.

Is this calories to joules converter free?

Yes. It's free and works in any browser, even offline once the page has loaded. The answer updates as you type, and nothing you enter is sent anywhere.

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