If you need to convert calories (cal) to kilojoules (kJ), this guide will provide you with a simple formula, a reference table, and practical examples to help you make the conversion easily.

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Conversion Formula

To convert calories (cal) to kilojoules (kJ), use the following formula:

Kilojoules = Calories × 4.184

Explanation:

• 1 calorie (cal) = 4.184 joules (J)
• Therefore, to convert calories to kilojoules, you multiply by 4.184 (since 1,000 joules = 1 kilojoule).

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Conversion Table: Calories to Kilojoules

Here’s a quick reference table for converting calories (cal) to kilojoules (kJ):

Calories (cal)	Kilojoules (kJ)
1	4.184
10	41.84
50	209.2
100	418.4
500	2,092
1,000	4,184
5,000	20,920
10,000	41,840
50,000	209,200
100,000	418,400

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Quick Conversion Example

Let’s say you have 150 calories and want to convert it to kilojoules.

Kilojoules = 150 × 4.184 = 627.6 kJ

So, 150 calories is equal to 627.6 kilojoules.

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Frequently Asked Questions (FAQs)

1. How do I convert kilojoules to calories?

To convert kilojoules (kJ) to calories (cal), use the inverse formula:

Calories = Kilojoules ÷ 4.184

For example, to convert 500 kJ to calories:

Calories = 500 ÷ 4.184 ≈ 119.5 cal

2. Why do we multiply by 4.184 in this conversion?

We multiply by 4.184 because 1 calorie is defined as 4.184 joules, and since 1 kilojoule = 1,000 joules, this gives us the conversion factor between calories and kilojoules.

3. Can I use an online converter for this?

Yes! Online converters are quick and easy tools for converting calories to kilojoules. Just input your value in calories, and the result will be displayed in kilojoules instantly.

4. Where is this conversion used?

This conversion is commonly used in nutrition (to convert food energy values), science, engineering, and physics. It’s essential for understanding energy content in food, fuel, or work-related calculations.

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Conclusion

Now you have the formula, table, and a practical example to convert calories (cal) to kilojoules (kJ). Whether you’re working with food energy, scientific calculations, or any other field requiring energy conversions, this formula makes it easy to understand the relationship between these two units of energy. Online tools can speed up the process, but understanding how the conversion works will always be valuable.