A femtojoule (fJ) is a metric-prefixed unit of energy equal to 10-15 joules, a fraction of a single joule, using the SI femto prefix.
Femtojoules to Gigajoules
Convert Femtojoule (fJ) to Gigajoule (GJ) instantly with an exact formula, conversion table, and FAQ.
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Convert femtojoules (fJ) 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 = fJ × 1.000000000e-24
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Formula
GJ = fJ × 1.000000000e-24
fJ = GJ × 1.000000000e+24
Conversion table
| 1 fJ | 1.000000e-24 GJ |
| 5 fJ | 5.000000e-24 GJ |
| 10 fJ | 1.000000e-23 GJ |
| 20 fJ | 2.000000e-23 GJ |
| 50 fJ | 5.000000e-23 GJ |
| 100 fJ | 1.000000e-22 GJ |
| 500 fJ | 5.000000e-22 GJ |
| 1000 fJ | 1.000000e-21 GJ |
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How the formula works
Both femtojoule and gigajoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in femtojoules by 1.000000000e-24 to get gigajoules. To reverse the conversion, multiply a gigajoule value by 1.000000000e+24 to get back to femtojoules.
Frequently asked questions
What is Femtojoule (fJ)?
A femtojoule (fJ) is a metric-prefixed unit of energy equal to 10-15 joules, a fraction of a single joule, using the SI femto 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 femtojoules to gigajoules?
Multiply the femtojoule value by 1.000000000e-24 to get the equivalent in gigajoules. For example, 5 fJ × 1.000000000e-24 = 5.000000e-24 GJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 1.000000000e-24 is an exact, non-rounded value.
Can I convert gigajoules back to femtojoules?
Yes. Divide the gigajoule value by 1.000000000e-24, or multiply it by 1.000000000e+24, to get femtojoules.
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About converting femtojoules to gigajoules
A femtojoule (fJ) is a metric-prefixed unit of energy equal to 10-15 joules, a fraction of a single joule, using the SI femto 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 femtojoules 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.