A gigajoule (GJ) is a metric-prefixed unit of energy equal to 109 joules, using the SI giga prefix.
Gigajoules to Microjoules
Convert Gigajoule (GJ) to Microjoule (uJ) instantly with an exact formula, conversion table, and FAQ.
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Convert gigajoules (GJ) 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 = GJ × 1.000000000e+15
Results update instantly for Gigajoules to Microjoules conversions.
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Formula
uJ = GJ × 1.000000000e+15
GJ = uJ × 1.000000000e-15
Conversion table
| 1 GJ | 1.000000e+15 uJ |
| 5 GJ | 5.000000e+15 uJ |
| 10 GJ | 1.000000e+16 uJ |
| 20 GJ | 2.000000e+16 uJ |
| 50 GJ | 5.000000e+16 uJ |
| 100 GJ | 1.000000e+17 uJ |
| 500 GJ | 5.000000e+17 uJ |
| 1000 GJ | 1.000000e+18 uJ |
Related conversions
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How the formula works
Both gigajoule and microjoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in gigajoules by 1.000000000e+15 to get microjoules. To reverse the conversion, multiply a microjoule value by 1.000000000e-15 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 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 gigajoules to microjoules?
Multiply the gigajoule value by 1.000000000e+15 to get the equivalent in microjoules. For example, 5 GJ × 1.000000000e+15 = 5.000000e+15 uJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 1.000000000e+15 is an exact, non-rounded value.
Can I convert microjoules back to gigajoules?
Yes. Divide the microjoule value by 1.000000000e+15, or multiply it by 1.000000000e-15, to get gigajoules.
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About converting gigajoules to microjoules
A gigajoule (GJ) is a metric-prefixed unit of energy equal to 109 joules, using the SI giga 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 gigajoules 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.