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 Nanojoules
Convert Millijoule (mJ) to Nanojoule (nJ) instantly with an exact formula, conversion table, and FAQ.
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Convert millijoules (mJ) to nanojoules (nJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A nanojoule (nJ) is a metric-prefixed unit of energy equal to 10-9 joules, a fraction of a single joule, using the SI nano prefix.
nJ = mJ × 1000000
Results update instantly for Millijoules to Nanojoules conversions.
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Formula
nJ = mJ × 1000000
mJ = nJ × 0.000001
Conversion table
| 1 mJ | 1.000000e+06 nJ |
| 5 mJ | 5.000000e+06 nJ |
| 10 mJ | 1.000000e+07 nJ |
| 20 mJ | 2.000000e+07 nJ |
| 50 mJ | 5.000000e+07 nJ |
| 100 mJ | 1.000000e+08 nJ |
| 500 mJ | 5.000000e+08 nJ |
| 1000 mJ | 1.000000e+09 nJ |
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How the formula works
Both millijoule and nanojoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in millijoules by 1000000 to get nanojoules. To reverse the conversion, multiply a nanojoule value by 0.000001 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 Nanojoule (nJ)?
A nanojoule (nJ) is a metric-prefixed unit of energy equal to 10-9 joules, a fraction of a single joule, using the SI nano prefix.
How do I convert millijoules to nanojoules?
Multiply the millijoule value by 1000000 to get the equivalent in nanojoules. For example, 5 mJ × 1000000 = 5.000000e+06 nJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 1000000 is an exact, non-rounded value.
Can I convert nanojoules back to millijoules?
Yes. Divide the nanojoule value by 1000000, or multiply it by 0.000001, to get millijoules.
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About converting millijoules to nanojoules
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 nanojoule (nJ) is a metric-prefixed unit of energy equal to 10-9 joules, a fraction of a single joule, using the SI nano prefix.
Use this calculator to move between millijoules and nanojoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.