⚡ Energy
cal to kJ Converter
Convert cal to kJ instantly with a reference conversion table.
Quick answer: To convert cal to kJ, multiply by 0.004184. For example, 1 cal = 0.004184 kJ. Use the calculator below for any value.
cal to kJ
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Common conversions
| cal | kJ |
|---|
Formula:
How to convert cal to kJ
1
Enter your value
Type the number of cal you want to convert into the left box. The result in kj appears instantly in the right box. You can also type into the right box to convert in the other direction.
2
Use the swap button
Click the ⇄ Swap button to reverse the conversion — kJ to cal. Your current value carries across so you don't have to re-enter anything.
3
About cal and kJ
cal and kJ are common energy measurements.
📊 Common conversions at a glance
| cal | kJ |
|---|---|
| 1 | 0.004184 |
| 100 | 0.4184 |
| 239 | 1 |
| 500 | 2.092 |
| 1000 | 4.184 |
| 5000 | 20.92 |
Reviewed for 2026. cal ↔ kJ conversion factor verified against published reference data. Built by a UK-based qualified primary teacher and FA Level 2 coach as part of 247QuickTools' free utility-tools project.
Frequently asked questions
How do I convert cal to kJ?
To convert cal to kJ, multiply by 0.004184. Or use the calculator above for instant results.
How many kJ are in 1 cal?
1 cal equals 0.004184 kJ.
Is the cal to kJ converter free?
Yes, the cal to kJ converter is completely free with no sign-up required, no downloads, and it works offline once the page has loaded.