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 Petajoules
Convert Millijoule (mJ) to Petajoule (PJ) instantly with an exact formula, conversion table, and FAQ.
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Convert millijoules (mJ) to petajoules (PJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A petajoule (PJ) is a metric-prefixed unit of energy equal to 1015 joules, using the SI peta prefix.
PJ = mJ × 1.000000000e-18
Results update instantly for Millijoules to Petajoules conversions.
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Formula
PJ = mJ × 1.000000000e-18
mJ = PJ × 1.000000000e+18
Conversion table
| 1 mJ | 1.000000e-18 PJ |
| 5 mJ | 5.000000e-18 PJ |
| 10 mJ | 1.000000e-17 PJ |
| 20 mJ | 2.000000e-17 PJ |
| 50 mJ | 5.000000e-17 PJ |
| 100 mJ | 1.000000e-16 PJ |
| 500 mJ | 5.000000e-16 PJ |
| 1000 mJ | 1.000000e-15 PJ |
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How the formula works
Both millijoule and petajoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in millijoules by 1.000000000e-18 to get petajoules. To reverse the conversion, multiply a petajoule value by 1.000000000e+18 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 Petajoule (PJ)?
A petajoule (PJ) is a metric-prefixed unit of energy equal to 1015 joules, using the SI peta prefix.
How do I convert millijoules to petajoules?
Multiply the millijoule value by 1.000000000e-18 to get the equivalent in petajoules. For example, 5 mJ × 1.000000000e-18 = 5.000000e-18 PJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 1.000000000e-18 is an exact, non-rounded value.
Can I convert petajoules back to millijoules?
Yes. Divide the petajoule value by 1.000000000e-18, or multiply it by 1.000000000e+18, to get millijoules.
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About converting millijoules to petajoules
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 petajoule (PJ) is a metric-prefixed unit of energy equal to 1015 joules, using the SI peta prefix.
Use this calculator to move between millijoules and petajoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.