A petajoule (PJ) is a metric-prefixed unit of energy equal to 1015 joules, using the SI peta prefix.
Petajoules to Gigajoules
Convert Petajoule (PJ) to Gigajoule (GJ) instantly with an exact formula, conversion table, and FAQ.
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Convert petajoules (PJ) to gigajoules (GJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A gigajoule (GJ) is a metric-prefixed unit of energy equal to 109 joules, using the SI giga prefix.
GJ = PJ × 1000000
Results update instantly for Petajoules to Gigajoules conversions.
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Formula
GJ = PJ × 1000000
PJ = GJ × 0.000001
Conversion table
| 1 PJ | 1.000000e+06 GJ |
| 5 PJ | 5.000000e+06 GJ |
| 10 PJ | 1.000000e+07 GJ |
| 20 PJ | 2.000000e+07 GJ |
| 50 PJ | 5.000000e+07 GJ |
| 100 PJ | 1.000000e+08 GJ |
| 500 PJ | 5.000000e+08 GJ |
| 1000 PJ | 1.000000e+09 GJ |
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How the formula works
Both petajoule and gigajoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in petajoules by 1000000 to get gigajoules. To reverse the conversion, multiply a gigajoule value by 0.000001 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 Gigajoule (GJ)?
A gigajoule (GJ) is a metric-prefixed unit of energy equal to 109 joules, using the SI giga prefix.
How do I convert petajoules to gigajoules?
Multiply the petajoule value by 1000000 to get the equivalent in gigajoules. For example, 5 PJ × 1000000 = 5.000000e+06 GJ.
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 gigajoules back to petajoules?
Yes. Divide the gigajoule value by 1000000, or multiply it by 0.000001, to get petajoules.
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About converting petajoules to gigajoules
A petajoule (PJ) is a metric-prefixed unit of energy equal to 1015 joules, using the SI peta prefix. A gigajoule (GJ) is a metric-prefixed unit of energy equal to 109 joules, using the SI giga prefix.
Use this calculator to move between petajoules and gigajoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.