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Convert joules to calories

1 joule equals 0.239006 calories. To convert joules to calories, divide the number of joules by 4.184: for example, 10 J is 2.39006 cal. Ethical Tube's free joules to calories converter does the math as you type, and the chart below lists common values.

1 J = 0.239006 cal

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

Conversion chart

joules to calories chart

Joules (J)Calories (cal)
1 J0.239006 cal
2 J0.478011 cal
3 J0.717017 cal
4 J0.956023 cal
5 J1.19503 cal
6 J1.43403 cal
8 J1.91205 cal
10 J2.39006 cal
12 J2.86807 cal
15 J3.58509 cal
20 J4.78011 cal
25 J5.97514 cal
50 J11.9503 cal
100 J23.9006 cal

How it works

How to convert joules to calories

  1. Know the formula

    cal = J × 0.239006. In words: divide the number of joules by 4.184.

  2. Work an example

    10 J → 2.39006 cal. Round to two or three decimal places for everyday use.

  3. 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 calories are in a joule?

There are 0.239006 calories in 1 joule. To convert joules to calories, divide the number of joules by 4.184.

What is 10 joules in calories?

10 joules is 2.39006 calories.

How do you convert calories back to joules?

Multiply the number of calories by 4.184. 1 calorie is 4.184 joules.

Is this joules to calories 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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