A gigajoule (GJ) is a metric-prefixed unit of energy equal to 109 joules, using the SI giga prefix.
Gigajoules to Petajoules
Convert Gigajoule (GJ) to Petajoule (PJ) instantly with an exact formula, conversion table, and FAQ.
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Convert gigajoules (GJ) 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 = GJ × 0.000001
Results update instantly for Gigajoules to Petajoules conversions.
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Formula
PJ = GJ × 0.000001
GJ = PJ × 1000000
Conversion table
| 1 GJ | 0.000001 PJ |
| 5 GJ | 0.000005 PJ |
| 10 GJ | 0.000010 PJ |
| 20 GJ | 0.000020 PJ |
| 50 GJ | 0.000050 PJ |
| 100 GJ | 0.000100 PJ |
| 500 GJ | 0.000500 PJ |
| 1000 GJ | 0.001000 PJ |
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How the formula works
Both gigajoule and petajoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in gigajoules by 0.000001 to get petajoules. To reverse the conversion, multiply a petajoule value by 1000000 to get back to gigajoules.
Frequently asked questions
What is Gigajoule (GJ)?
A gigajoule (GJ) is a metric-prefixed unit of energy equal to 109 joules, using the SI giga 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 gigajoules to petajoules?
Multiply the gigajoule value by 0.000001 to get the equivalent in petajoules. For example, 5 GJ × 0.000001 = 0.000005 PJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 0.000001 is an exact, non-rounded value.
Can I convert petajoules back to gigajoules?
Yes. Divide the petajoule value by 0.000001, or multiply it by 1000000, to get gigajoules.
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About converting gigajoules to petajoules
A gigajoule (GJ) is a metric-prefixed unit of energy equal to 109 joules, using the SI giga 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 gigajoules 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.