⚡ Energy
joules to calories Converter
Convert joules to calories instantly with a reference conversion table.
Quick answer: To convert joules to calories, multiply by 0.239006. For example, 1 joules = 0.239006 calories. Use the calculator below for any value.
joules to calories
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Common conversions
| joules | calories |
|---|
Formula:
How to convert joules to calories
1
Enter your value
Type the number of joules you want to convert into the left box. The result in calories 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 — calories to joules. Your current value carries across so you don't have to re-enter anything.
3
About joules and calories
joules and calories are common energy measurements.
📊 Common conversions at a glance
| joules | calories |
|---|---|
| 1 | 0.239 |
| 4.184 | 1 |
| 10 | 2.39 |
| 100 | 23.9 |
| 1000 | 239 |
| 10000 | 2390 |
Reviewed for 2026. joules ↔ calories 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.