A kilocalorie (kcal) equals 1,000 small calories and is the unit behind the food "Calorie" shown on nutrition labels.
Kilocalories to Megajoules
Convert Kilocalorie (kcal) to Megajoule (MJ) instantly with an exact formula, conversion table, and FAQ.
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Convert kilocalories (kcal) to megajoules (MJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A megajoule (MJ) is a metric-prefixed unit of energy equal to 106 joules, using the SI mega prefix.
MJ = kcal × 0.004184
Results update instantly for Kilocalories to Megajoules conversions.
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Formula
MJ = kcal × 0.004184
kcal = MJ × 239.0057361
Conversion table
| 1 kcal | 0.004184 MJ |
| 5 kcal | 0.020920 MJ |
| 10 kcal | 0.041840 MJ |
| 20 kcal | 0.083680 MJ |
| 50 kcal | 0.209200 MJ |
| 100 kcal | 0.418400 MJ |
| 500 kcal | 2.092000 MJ |
| 1000 kcal | 4.184000 MJ |
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How the formula works
Both kilocalorie and megajoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in kilocalories by 0.004184 to get megajoules. To reverse the conversion, multiply a megajoule value by 239.0057361 to get back to kilocalories.
Frequently asked questions
What is Kilocalorie (kcal)?
A kilocalorie (kcal) equals 1,000 small calories and is the unit behind the food "Calorie" shown on nutrition labels.
What is Megajoule (MJ)?
A megajoule (MJ) is a metric-prefixed unit of energy equal to 106 joules, using the SI mega prefix.
How do I convert kilocalories to megajoules?
Multiply the kilocalorie value by 0.004184 to get the equivalent in megajoules. For example, 5 kcal × 0.004184 = 0.020920 MJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 0.004184 is an exact, non-rounded value.
Can I convert megajoules back to kilocalories?
Yes. Divide the megajoule value by 0.004184, or multiply it by 239.0057361, to get kilocalories.
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About converting kilocalories to megajoules
A kilocalorie (kcal) equals 1,000 small calories and is the unit behind the food "Calorie" shown on nutrition labels. A megajoule (MJ) is a metric-prefixed unit of energy equal to 106 joules, using the SI mega prefix.
Use this calculator to move between kilocalories and megajoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.