Calories to Joules converter (cal to J)
Convert Calories (cal) to Joules (J) 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 Calories to Joules
1 calorie (cal) is equal to 4.184 joules (J).
E(J) = E(cal) × 4.184
Multiply calories by 4.184:
Example: Convert 100 cal to joules:
E(J) = 100 × 4.184 = 418.4 J
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.
What is a Joules?
The Joules (J) 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 Calories into Joules. One cal equals 4.184 J.
Calories to Joules conversion table
Common cal values and the matching J result, calculated with the same factor as the widget. Highlight a nearby row if you want a quick check without entering a number.
| Calories (cal) | Joules (J) |
|---|---|
| 0 cal | 0 J |
| 1 cal | 4.184 J |
| 5 cal | 20.92 J |
| 10 cal | 41.84 J |
| 50 cal | 209.2 J |
| 100 cal | 418.4 J |
| 500 cal | 2092 J |
| 1000 cal | 4184 J |
How this calculator works
The form on this page is a Calories-to-Joules converter. After you enter a number, JavaScript multiplies or rearranges it with the published conversion factor and writes the J 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 J are in 1 cal?
1 cal = 4.184 J.
How do I convert Calories to Joules?
Multiply calories by 4.184:
Is this cal to J 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.