Kilocalories to Joules converter (kcal to J)
Convert Kilocalories (kcal) 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 Kilocalories to Joules
1 kilocalorie (kcal) is equal to 4184 joules (J).
E(J) = E(kcal) × 4184
Multiply kcal by 4184:
Example: Convert 10 kcal to joules:
E(J) = 10 × 4184 = 41840 J
What is a Kilocalories?
The Kilocalories (kcal) 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 Kilocalories into Joules. One kcal equals 4184 J.
Kilocalories to Joules conversion table
Common kcal 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.
| Kilocalories (kcal) | Joules (J) |
|---|---|
| 0 kcal | 0 J |
| 1 kcal | 4184 J |
| 5 kcal | 20920 J |
| 10 kcal | 41840 J |
| 50 kcal | 209200 J |
| 100 kcal | 418400 J |
| 500 kcal | 2092000 J |
| 1000 kcal | 4184000 J |
How this calculator works
The form on this page is a Kilocalories-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 kcal?
1 kcal = 4184 J.
How do I convert Kilocalories to Joules?
Multiply kcal by 4184:
Is this kcal 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.