A millijoule (mJ) is a metric-prefixed unit of energy equal to 10-3 joules, a fraction of a single joule, using the SI milli prefix.
Millijoules to Kilocalories
Convert Millijoule (mJ) to Kilocalorie (kcal) instantly with an exact formula, conversion table, and FAQ.
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Convert millijoules (mJ) to kilocalories (kcal) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A kilocalorie (kcal) equals 1,000 small calories and is the unit behind the food "Calorie" shown on nutrition labels.
kcal = mJ × 2.390057361e-07
Results update instantly for Millijoules to Kilocalories conversions.
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Formula
kcal = mJ × 2.390057361e-07
mJ = kcal × 4184000
Conversion table
| 1 mJ | 2.390057e-07 kcal |
| 5 mJ | 0.000001 kcal |
| 10 mJ | 0.000002 kcal |
| 20 mJ | 0.000005 kcal |
| 50 mJ | 0.000012 kcal |
| 100 mJ | 0.000024 kcal |
| 500 mJ | 0.000120 kcal |
| 1000 mJ | 0.000239 kcal |
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How the formula works
Both millijoule and kilocalorie measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in millijoules by 2.390057361e-07 to get kilocalories. To reverse the conversion, multiply a kilocalorie value by 4184000 to get back to millijoules.
Frequently asked questions
What is Millijoule (mJ)?
A millijoule (mJ) is a metric-prefixed unit of energy equal to 10-3 joules, a fraction of a single joule, using the SI milli prefix.
What is Kilocalorie (kcal)?
A kilocalorie (kcal) equals 1,000 small calories and is the unit behind the food "Calorie" shown on nutrition labels.
How do I convert millijoules to kilocalories?
Multiply the millijoule value by 2.390057361e-07 to get the equivalent in kilocalories. For example, 5 mJ × 2.390057361e-07 = 0.000001 kcal.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 2.390057361e-07 is an exact, non-rounded value.
Can I convert kilocalories back to millijoules?
Yes. Divide the kilocalorie value by 2.390057361e-07, or multiply it by 4184000, to get millijoules.
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About converting millijoules to kilocalories
A millijoule (mJ) is a metric-prefixed unit of energy equal to 10-3 joules, a fraction of a single joule, using the SI milli prefix. A kilocalorie (kcal) equals 1,000 small calories and is the unit behind the food "Calorie" shown on nutrition labels.
Use this calculator to move between millijoules and kilocalories accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.