Kilocalorie to Kilojoule Converter
Convert kilocalories to kilojoules (kcal to kJ) instantly with this free online energy converter. Enter any value in the Kilocalorie field and get the equivalent in Kilojoule 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 kcal = 4.184 kJ. To convert kilocalories to kilojoules, multiply your Kilocalorie value by 4.184. For example, 10 kcal = 41.84 kJ. You can also reverse the calculation: 1 kJ = 0.2390057361 kcal.
Quick conversion table
| Kilocalorie (kcal) | Kilojoule (kJ) |
|---|---|
| 1 kcal | 4.184 kJ |
| 5 kcal | 20.92 kJ |
| 10 kcal | 41.84 kJ |
| 25 kcal | 104.6 kJ |
| 50 kcal | 209.2 kJ |
| 100 kcal | 418.4 kJ |
Use the swap button to reverse the direction, or choose a different unit from the dropdown menus to convert within the energy category.
Formula
Kilocalorie to Kilojoule conversion: 1 kcal = 4.184 kJ kilojoules = kilocalories × 4.184 1 kJ = 0.2390057361 kcal kilocalories = kilojoules × 0.2390057361
Example
Example: Convert 10 kcal to kJ: 10 kcal × 4.184 = 41.84 kJ So, 10 kcal is about 41.84 kJ. To convert back, multiply by 0.2390057361: 41.84 kJ × 0.2390057361 = 10 kcal.
How to Use
- Enter the value you want to convert in the Kilocalorie field
- The result in Kilojoule 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 kilocalories to kilojoules?
Enter the value in Kilocalorie (kcal) in the 'From' field. The equivalent in Kilojoule (kJ) 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 kcal to kJ?
1 kcal = 4.184 kJ, so kilojoules = kilocalories × 4.184. To convert back, 1 kJ = 0.2390057361 kcal. The full formula and a worked example are shown on this page.
How many kilojoules are in one Kilocalorie?
1 kcal = 4.184 kJ.
Is this Kilocalorie to Kilojoule 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 kilojoules back to kilocalories?
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 kcal to kJ 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.