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Kilocalories to Kilojoules Converter

Free instant kcal → kJ converter. No signup, no uploads — everything is calculated privately in your browser.

Value

From

1 kcal = 4.184 kilojoules

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Quick Answer

1 kilocalorie equals 4.184 kilojoules. To convert kilocalories to kilojoules, multiply the value by this factor.

Key Facts

Reverse: 1 kilojoule = 0.239006 kilocalories.

Kilocalories to Kilojoules Formula

Formula: value × 4.184

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Kilocalories to Kilojoules Conversion Table

Kilocalories (kcal)	Kilojoules (kJ)
1 kcal	4.184 kJ
2 kcal	8.368 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
250 kcal	1,046 kJ
500 kcal	2,092 kJ
1,000 kcal	4,184 kJ

Frequently Asked Questions

How do I convert kilocalories to kilojoules?

Enter the value above and the result appears instantly — the calculation runs entirely in your browser. Formula: value × 4.184.

What is the exact kilocalories to kilojoules conversion factor?

1 kilocalorie = 4.184 kilojoules (shown to 6 significant figures — the converter itself computes at full precision). The reverse factor is 1 kilojoule = 0.239006 kilocalories.

What are some common kilocalories to kilojoules conversions?

1 kcal = 4.184 kJ; 10 kcal = 41.84 kJ; 100 kcal = 418.4 kJ. Use the full conversion table below for more reference values.

Is a calorie the same as a food Calorie?

No — and the capital letter matters. A food Calorie (with a capital C) is a kilocalorie: 1,000 small calories. This converter treats them correctly: 1 kcal = 4.184 kJ = 1,000 cal. Energy labels on food almost always mean kilocalories, even where the label just says "calories".

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