Convert Kilocalories to Kilojoules — Instantly
Convert kilocalories to kilojoules (kJ) instantly using the formula kilojoules = kilocalories × 4.184. Includes a calculator, conversion table, worked examples, and FAQs.
Kilocalories to kilojoules converter
Quick Reference
Kilocalories to Kilojoules Conversion Table
Common kilocalorie to kilojoule conversions at a glance, using the exact relationship 1 kilocalorie = 4.184 kJ.
| Kilocalories (kcal) | Calculation | Kilojoules (kJ) |
|---|---|---|
| 0.1 kcal | 0.1 × 4.184 | 0.4184 kJ |
| 0.5 kcal | 0.5 × 4.184 | 2.092 kJ |
| 1 kcal | 1 × 4.184 | 4.184 kJ |
| 2 kcal | 2 × 4.184 | 8.368 kJ |
| 5 kcal | 5 × 4.184 | 20.92 kJ |
| 10 kcal | 10 × 4.184 | 41.84 kJ |
| 50 kcal | 50 × 4.184 | 209.2 kJ |
| 100 kcal | 100 × 4.184 | 418.4 kJ |
| 500 kcal | 500 × 4.184 | 2,092 kJ |
| 1,000 kcal | 1,000 × 4.184 | 4,184 kJ |
| 5,000 kcal | 5,000 × 4.184 | 20,920 kJ |
| 10,000 kcal | 10,000 × 4.184 | 41,840 kJ |
Step-by-Step
How to Convert Kilocalories to Kilojoules
Converting kilocalories to kilojoules is simple when you use the correct conversion factor.
The Formula
Kilocalories and kilojoules are both units of energy used in nutrition, chemistry, exercise science, and general energy measurement. This page uses the exact relationship 1 kilocalorie = 4.184 kilojoules.
To convert kilojoules back to kilocalories, divide kilojoules by 4.184.
How to Turn Kilocalories into Kilojoules — Step by Step
Write down the kilocalorie value
Identify the number of kilocalories you want to convert — for example, 10 kcal.
Multiply by 4.184
10 kcal × 4.184 = 41.84 kilojoules. This gives you the equivalent energy in kilojoules.
Label your answer
Always write the unit (kJ or kilojoules) after the number so the result is clear and unambiguous.
Kilocalories vs Kilojoules
What Is the Difference Between Kilocalories and Kilojoules?
Kilocalories and kilojoules are both units of energy. Kilojoules are part of the SI system, while kilocalories are commonly used in food energy labeling, diet planning, exercise tracking, and nutrition discussions.
The relationship used on this page is: 1 kilocalorie = 4.184 kilojoules. To convert kilocalories to kilojoules, multiply the number of kilocalories by 4.184.
For example, 0.5 kcal = 2.092 kJ, 1 kcal = 4.184 kJ, and 10 kcal = 41.84 kJ.
This conversion is useful in nutrition labels, food energy comparisons, workout tracking, chemistry calculations, and general energy conversions.
Worked Examples
Sample Kilocalorie to Kilojoule Calculations
Here is how to calculate kilocalories to kilojoules for commonly searched values.
0.5 kilocalorie to kilojoules
0.5 × 4.184 = 2.092 kilojoules.
1 kilocalorie to kilojoules
1 × 4.184 = 4.184 kilojoules.
2 kilocalories to kilojoules
2 × 4.184 = 8.368 kilojoules.
5 kilocalories to kilojoules
5 × 4.184 = 20.92 kilojoules.
10 kilocalories to kilojoules
10 × 4.184 = 41.84 kilojoules.
50 kilocalories to kilojoules
50 × 4.184 = 209.2 kilojoules.
100 kilocalories to kilojoules
100 × 4.184 = 418.4 kilojoules.
1,000 kilocalories to kilojoules
1,000 × 4.184 = 4,184 kilojoules.
FAQ
Frequently Asked Questions
Everything you need to know about converting kilocalories to kilojoules.