A megajoule (MJ) is a metric-prefixed unit of energy equal to 106 joules, using the SI mega prefix.
Megajoules to Calories
Convert Megajoule (MJ) to Calorie (cal) instantly with an exact formula, conversion table, and FAQ.
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Convert megajoules (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 × 239005.7361
Results update instantly for Megajoules to Calories conversions.
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Formula
cal = MJ × 239005.7361
MJ = cal × 0.000004184
Conversion table
| 1 MJ | 239005.736138 cal |
| 5 MJ | 1.195029e+06 cal |
| 10 MJ | 2.390057e+06 cal |
| 20 MJ | 4.780115e+06 cal |
| 50 MJ | 1.195029e+07 cal |
| 100 MJ | 2.390057e+07 cal |
| 500 MJ | 1.195029e+08 cal |
| 1000 MJ | 2.390057e+08 cal |
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How the formula works
Both megajoule and calorie measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in megajoules by 239005.7361 to get calories. To reverse the conversion, multiply a calorie value by 0.000004184 to get back to megajoules.
Frequently asked questions
What is Megajoule (MJ)?
A megajoule (MJ) is a metric-prefixed unit of energy equal to 106 joules, using the SI mega 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 megajoules to calories?
Multiply the megajoule value by 239005.7361 to get the equivalent in calories. For example, 5 MJ × 239005.7361 = 1.195029e+06 cal.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 239005.7361 is an exact, non-rounded value.
Can I convert calories back to megajoules?
Yes. Divide the calorie value by 239005.7361, or multiply it by 0.000004184, to get megajoules.
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About converting megajoules to calories
A megajoule (MJ) is a metric-prefixed unit of energy equal to 106 joules, using the SI mega 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 megajoules 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.