A petajoule (PJ) is a metric-prefixed unit of energy equal to 1015 joules, using the SI peta prefix.
Petajoules to Megajoules
Convert Petajoule (PJ) to Megajoule (MJ) instantly with an exact formula, conversion table, and FAQ.
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Convert petajoules (PJ) 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 = PJ × 1000000000
Results update instantly for Petajoules to Megajoules conversions.
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Formula
MJ = PJ × 1000000000
PJ = MJ × 1.000000000e-09
Conversion table
| 1 PJ | 1.000000e+09 MJ |
| 5 PJ | 5.000000e+09 MJ |
| 10 PJ | 1.000000e+10 MJ |
| 20 PJ | 2.000000e+10 MJ |
| 50 PJ | 5.000000e+10 MJ |
| 100 PJ | 1.000000e+11 MJ |
| 500 PJ | 5.000000e+11 MJ |
| 1000 PJ | 1.000000e+12 MJ |
Related conversions
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How the formula works
Both petajoule and megajoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in petajoules by 1000000000 to get megajoules. To reverse the conversion, multiply a megajoule value by 1.000000000e-09 to get back to petajoules.
Frequently asked questions
What is Petajoule (PJ)?
A petajoule (PJ) is a metric-prefixed unit of energy equal to 1015 joules, using the SI peta prefix.
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 petajoules to megajoules?
Multiply the petajoule value by 1000000000 to get the equivalent in megajoules. For example, 5 PJ × 1000000000 = 5.000000e+09 MJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 1000000000 is an exact, non-rounded value.
Can I convert megajoules back to petajoules?
Yes. Divide the megajoule value by 1000000000, or multiply it by 1.000000000e-09, to get petajoules.
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About converting petajoules to megajoules
A petajoule (PJ) is a metric-prefixed unit of energy equal to 1015 joules, using the SI peta prefix. 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 petajoules 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.