A kilojoule (kJ) equals 1,000 joules and is commonly used on nutrition labels outside the United States.
Kilojoules to Megajoules
Convert Kilojoule (kJ) to Megajoule (MJ) instantly with an exact formula, conversion table, and FAQ.
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Convert kilojoules (kJ) 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 = kJ × 0.001
Results update instantly for Kilojoules to Megajoules conversions.
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Formula
MJ = kJ × 0.001
kJ = MJ × 1000
Conversion table
| 1 kJ | 0.001000 MJ |
| 5 kJ | 0.005000 MJ |
| 10 kJ | 0.010000 MJ |
| 20 kJ | 0.020000 MJ |
| 50 kJ | 0.050000 MJ |
| 100 kJ | 0.100000 MJ |
| 500 kJ | 0.500000 MJ |
| 1000 kJ | 1 MJ |
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How the formula works
Both kilojoule and megajoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in kilojoules by 0.001 to get megajoules. To reverse the conversion, multiply a megajoule value by 1000 to get back to kilojoules.
Frequently asked questions
What is Kilojoule (kJ)?
A kilojoule (kJ) equals 1,000 joules and is commonly used on nutrition labels outside the United States.
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 kilojoules to megajoules?
Multiply the kilojoule value by 0.001 to get the equivalent in megajoules. For example, 5 kJ × 0.001 = 0.005000 MJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 0.001 is an exact, non-rounded value.
Can I convert megajoules back to kilojoules?
Yes. Divide the megajoule value by 0.001, or multiply it by 1000, to get kilojoules.
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About converting kilojoules to megajoules
A kilojoule (kJ) equals 1,000 joules and is commonly used on nutrition labels outside the United States. 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 kilojoules 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.