Calories to Kilojoules converter (cal to kJ)
Convert Calories (cal) to Kilojoules (kJ) 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 Kilojoules
1 calorie (cal) is equal to 0.004184 kilojoules (kJ).
E(kJ) = E(cal) × 0.004184
Multiply calories by 0.004184:
Example: Convert 1000 cal to kJ:
E(kJ) = 1000 × 0.004184 = 4.184 kJ
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 Kilojoules?
The Kilojoules (kJ) 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 Kilojoules. One cal equals 0.004184 kJ.
Calories to Kilojoules conversion table
Common cal values and the matching kJ 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) | Kilojoules (kJ) |
|---|---|
| 0 cal | 0 kJ |
| 1 cal | 0.004184 kJ |
| 5 cal | 0.02092 kJ |
| 10 cal | 0.04184 kJ |
| 50 cal | 0.2092 kJ |
| 100 cal | 0.4184 kJ |
| 500 cal | 2.092 kJ |
| 1000 cal | 4.184 kJ |
How this calculator works
The form on this page is a Calories-to-Kilojoules converter. After you enter a number, JavaScript multiplies or rearranges it with the published conversion factor and writes the kJ 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 kJ are in 1 cal?
1 cal = 0.004184 kJ.
How do I convert Calories to Kilojoules?
Multiply calories by 0.004184:
Is this cal to kJ 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.