Calorie to Joule Converter
Convert calories to joules (cal to J) instantly with this free online energy converter. Enter any value in the Calorie field and get the equivalent in Joule immediately. This converter handles any quantity — from tiny fractions to large numbers — with full precision. No signup, no ads in the widget, and the conversion runs entirely in your browser for instant results.
The conversion factor is exact: 1 cal = 4.184 J. To convert calories to joules, multiply your Calorie value by 4.184. For example, 10 cal = 41.84 J. You can also reverse the calculation: 1 J = 0.2390057361 cal.
Quick conversion table
| Calorie (cal) | Joule (J) |
|---|---|
| 1 cal | 4.184 J |
| 5 cal | 20.92 J |
| 10 cal | 41.84 J |
| 25 cal | 104.6 J |
| 50 cal | 209.2 J |
| 100 cal | 418.4 J |
Use the swap button to reverse the direction, or choose a different unit from the dropdown menus to convert within the energy category.
Formula
Calorie to Joule conversion: 1 cal = 4.184 J joules = calories × 4.184 1 J = 0.2390057361 cal calories = joules × 0.2390057361
Example
Example: Convert 10 cal to J: 10 cal × 4.184 = 41.84 J So, 10 cal is about 41.84 J. To convert back, multiply by 0.2390057361: 41.84 J × 0.2390057361 = 10 cal.
How to Use
- Enter the value you want to convert in the Calorie field
- The result in Joule appears instantly below
- Use the dropdown menus to change units if needed
- Click 'Swap Units' to reverse the conversion direction
- Copy the result or adjust the input for a new conversion
Frequently Asked Questions
How do I convert calories to joules?
Enter the value in Calorie (cal) in the 'From' field. The equivalent in Joule (J) appears instantly in the 'To' field. The converter uses precise conversion factors and updates in real time as you type.
What is the formula to convert cal to J?
1 cal = 4.184 J, so joules = calories × 4.184. To convert back, 1 J = 0.2390057361 cal. The full formula and a worked example are shown on this page.
How many joules are in one Calorie?
1 cal = 4.184 J.
Is this Calorie to Joule converter free?
Yes, completely free with no signup, no limits, and no ads in the converter widget. You can convert as many values as you need. The tool runs entirely in your browser, so your data never leaves your device.
Can I convert joules back to calories?
Yes. Click the 'Swap Units' button to reverse the direction. You can also use the dropdown menus to select any other energy unit for either field.
How accurate is the cal to J conversion?
The converter uses high-precision conversion factors (up to 8 decimal places). Results are displayed with up to 6 decimal places, with trailing zeros removed for readability. For scientific or engineering work, always verify with official standards.