A petajoule (PJ) is a metric-prefixed unit of energy equal to 1015 joules, using the SI peta prefix.
Petajoules to Microjoules
Convert Petajoule (PJ) to Microjoule (uJ) instantly with an exact formula, conversion table, and FAQ.
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Convert petajoules (PJ) to microjoules (uJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A microjoule (uJ) is a metric-prefixed unit of energy equal to 10-6 joules, a fraction of a single joule, using the SI micro prefix.
uJ = PJ × 1.000000000e+21
Results update instantly for Petajoules to Microjoules conversions.
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Formula
uJ = PJ × 1.000000000e+21
PJ = uJ × 1.000000000e-21
Conversion table
| 1 PJ | 1.000000e+21 uJ |
| 5 PJ | 5.000000e+21 uJ |
| 10 PJ | 1.000000e+22 uJ |
| 20 PJ | 2.000000e+22 uJ |
| 50 PJ | 5.000000e+22 uJ |
| 100 PJ | 1.000000e+23 uJ |
| 500 PJ | 5.000000e+23 uJ |
| 1000 PJ | 1.000000e+24 uJ |
Related conversions
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How the formula works
Both petajoule and microjoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in petajoules by 1.000000000e+21 to get microjoules. To reverse the conversion, multiply a microjoule value by 1.000000000e-21 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 Microjoule (uJ)?
A microjoule (uJ) is a metric-prefixed unit of energy equal to 10-6 joules, a fraction of a single joule, using the SI micro prefix.
How do I convert petajoules to microjoules?
Multiply the petajoule value by 1.000000000e+21 to get the equivalent in microjoules. For example, 5 PJ × 1.000000000e+21 = 5.000000e+21 uJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 1.000000000e+21 is an exact, non-rounded value.
Can I convert microjoules back to petajoules?
Yes. Divide the microjoule value by 1.000000000e+21, or multiply it by 1.000000000e-21, to get petajoules.
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About converting petajoules to microjoules
A petajoule (PJ) is a metric-prefixed unit of energy equal to 1015 joules, using the SI peta prefix. A microjoule (uJ) is a metric-prefixed unit of energy equal to 10-6 joules, a fraction of a single joule, using the SI micro prefix.
Use this calculator to move between petajoules and microjoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.