J to Calories converter (J to cal)
Convert J (J) to Calories (cal) with this free calculator. Type a value, press Convert, and the page applies the same factor shown in the formula below — no rounded shortcut, and nothing is stored on a server.
How to convert J to Calories
1 joule (J) is equal to 0.239006 calories (cal).
E(cal) = E(J) ÷ 4.184
Divide the energy in joules by 4.184:
Example: Convert 100 J to calories:
E(cal) = 100 ÷ 4.184 = 23.9 cal
What is a J?
The J (J) is the starting or target unit on this page. Use the calculator above to convert values without looking up the factor by hand.
What is a Calories?
The Calories (cal) is the starting or target unit on this page. Use the calculator above to convert values without looking up the factor by hand.
This page converts energy from J into Calories. One J equals 0.239005736 cal.
J to Calories conversion table
Common J values and the matching cal result, calculated with the same factor as the widget. Highlight a nearby row if you want a quick check without entering a number.
| J (J) | Calories (cal) |
|---|---|
| 0 J | 0 cal |
| 10 J | 2.390057361 cal |
| 50 J | 11.950286805 cal |
| 100 J | 23.90057361 cal |
| 500 J | 119.50286805 cal |
| 1000 J | 239.0057361 cal |
How this calculator works
The form on this page is a J-to-Calories converter. After you enter a number, JavaScript multiplies or rearranges it with the published conversion factor and writes the cal result in the output box. The step-by-step panel repeats the arithmetic so you can copy it into homework or a spreadsheet.
Reviewed by Hamsen, founder of GigaTables and a biology engineer. See the about page for how formulas are checked before a tool is published.
FAQ
How many cal are in 1 J?
1 J = 0.239005736 cal.
How do I convert J to Calories?
Divide the energy in joules by 4.184:
Is this J to cal converter free?
Yes. GigaTables calculators are free to use in a browser. You do not need an account, and the values you type are not uploaded.