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 Calories
Convert Millijoule (mJ) to Calorie (cal) instantly with an exact formula, conversion table, and FAQ.
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Convert millijoules (mJ) to calories (cal) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A (small) calorie is a thermochemical unit of heat energy equal to 4.184 joules, historically the energy needed to raise 1 gram of water by 1°C.
cal = mJ × 0.0002390057361
Results update instantly for Millijoules to Calories conversions.
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Formula
cal = mJ × 0.0002390057361
mJ = cal × 4184
Conversion table
| 1 mJ | 0.000239 cal |
| 5 mJ | 0.001195 cal |
| 10 mJ | 0.002390 cal |
| 20 mJ | 0.004780 cal |
| 50 mJ | 0.011950 cal |
| 100 mJ | 0.023901 cal |
| 500 mJ | 0.119503 cal |
| 1000 mJ | 0.239006 cal |
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How the formula works
Both millijoule and calorie measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in millijoules by 0.0002390057361 to get calories. To reverse the conversion, multiply a calorie value by 4184 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 Calorie (cal)?
A (small) calorie is a thermochemical unit of heat energy equal to 4.184 joules, historically the energy needed to raise 1 gram of water by 1°C.
How do I convert millijoules to calories?
Multiply the millijoule value by 0.0002390057361 to get the equivalent in calories. For example, 5 mJ × 0.0002390057361 = 0.001195 cal.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 0.0002390057361 is an exact, non-rounded value.
Can I convert calories back to millijoules?
Yes. Divide the calorie value by 0.0002390057361, or multiply it by 4184, to get millijoules.
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About converting millijoules to calories
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 (small) calorie is a thermochemical unit of heat energy equal to 4.184 joules, historically the energy needed to raise 1 gram of water by 1°C.
Use this calculator to move between millijoules and calories accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.