Kilojoule to Calorie Converter
Convert kilojoules to calories (kJ to cal) instantly with this free online energy converter. Enter any value in the Kilojoule field and get the equivalent in Calorie 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 kJ = 239.0057361 cal. To convert kilojoules to calories, multiply your Kilojoule value by 239.0057361. For example, 10 kJ = 2390.057361 cal. You can also reverse the calculation: 1 cal = 0.004184 kJ.
Quick conversion table
| Kilojoule (kJ) | Calorie (cal) |
|---|---|
| 1 kJ | 239.0057361 cal |
| 5 kJ | 1195.028681 cal |
| 10 kJ | 2390.057361 cal |
| 25 kJ | 5975.143403 cal |
| 50 kJ | 11950.28681 cal |
| 100 kJ | 23900.57361 cal |
Use the swap button to reverse the direction, or choose a different unit from the dropdown menus to convert within the energy category.
Formula
Kilojoule to Calorie conversion: 1 kJ = 239.0057361 cal calories = kilojoules × 239.0057361 1 cal = 0.004184 kJ kilojoules = calories × 0.004184
Example
Example: Convert 10 kJ to cal: 10 kJ × 239.0057361 = 2390.057361 cal So, 10 kJ is about 2390.057361 cal. To convert back, multiply by 0.004184: 2390.057361 cal × 0.004184 = 10 kJ.
How to Use
- Enter the value you want to convert in the Kilojoule field
- The result in Calorie 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 kilojoules to calories?
Enter the value in Kilojoule (kJ) in the 'From' field. The equivalent in Calorie (cal) 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 kJ to cal?
1 kJ = 239.0057361 cal, so calories = kilojoules × 239.0057361. To convert back, 1 cal = 0.004184 kJ. The full formula and a worked example are shown on this page.
How many calories are in one Kilojoule?
1 kJ = 239.0057361 cal.
Is this Kilojoule to Calorie 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 calories back to kilojoules?
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 kJ to cal 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.