Convert kcal to kJ
Use this kcal to kJ converter to convert kilocalories into kilojoules instantly. Enter a value in kcal and the calculator will show the equivalent kJ.
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) |
|---|---|---|
| 1 kcal | 1 × 4.184 | 4.184 kJ |
| 150 kcal | 150 × 4.184 | 627.6 kJ |
| 200 kcal | 200 × 4.184 | 836.8 kJ |
| 500 kcal | 500 × 4.184 | 2,092 kJ |
| 1,200 kcal | 1,200 × 4.184 | 5,020.8 kJ |
| 1,500 kcal | 1,500 × 4.184 | 6,276 kJ |
| 1,600 kcal | 1,600 × 4.184 | 6,694.4 kJ |
| 2,000 kcal | 2,000 × 4.184 | 8,368 kJ |
| 2,500 kcal | 2,500 × 4.184 | 10,460 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
Common kcal to kJ Calculations
To convert kcal to kJ, multiply the kilocalorie value by 4.184. Here are a few common examples.
123 kcal to kJ
123 × 4.184 = 514.632 kJ.
35 kcal to kJ
35 × 4.184 = 146.44 kJ.
440 kcal to kJ
440 × 4.184 = 1,840.96 kJ.
60 kcal to kJ
60 × 4.184 = 251.04 kJ.
300 kcal to kJ
300 × 4.184 = 1,255.2 kJ.
80 kcal to kJ
80 × 4.184 = 334.72 kJ.
FAQ
Frequently Asked Questions
Simple answers about converting kcal to kJ and understanding food energy labels.