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 Yoctojoules
Convert Femtojoule (fJ) to Yoctojoule (yJ) instantly with an exact formula, conversion table, and FAQ.
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Convert femtojoules (fJ) to yoctojoules (yJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A yoctojoule (yJ) is a metric-prefixed unit of energy equal to 10-24 joules, a fraction of a single joule, using the SI yocto prefix.
yJ = fJ × 1000000000
Results update instantly for Femtojoules to Yoctojoules conversions.
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Formula
yJ = fJ × 1000000000
fJ = yJ × 1.000000000e-09
Conversion table
| 1 fJ | 1.000000e+09 yJ |
| 5 fJ | 5.000000e+09 yJ |
| 10 fJ | 1.000000e+10 yJ |
| 20 fJ | 2.000000e+10 yJ |
| 50 fJ | 5.000000e+10 yJ |
| 100 fJ | 1.000000e+11 yJ |
| 500 fJ | 5.000000e+11 yJ |
| 1000 fJ | 1.000000e+12 yJ |
Related conversions
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How the formula works
Both femtojoule and yoctojoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in femtojoules by 1000000000 to get yoctojoules. To reverse the conversion, multiply a yoctojoule value by 1.000000000e-09 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 Yoctojoule (yJ)?
A yoctojoule (yJ) is a metric-prefixed unit of energy equal to 10-24 joules, a fraction of a single joule, using the SI yocto prefix.
How do I convert femtojoules to yoctojoules?
Multiply the femtojoule value by 1000000000 to get the equivalent in yoctojoules. For example, 5 fJ × 1000000000 = 5.000000e+09 yJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 1000000000 is an exact, non-rounded value.
Can I convert yoctojoules back to femtojoules?
Yes. Divide the yoctojoule value by 1000000000, or multiply it by 1.000000000e-09, to get femtojoules.
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About converting femtojoules to yoctojoules
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 yoctojoule (yJ) is a metric-prefixed unit of energy equal to 10-24 joules, a fraction of a single joule, using the SI yocto prefix.
Use this calculator to move between femtojoules and yoctojoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.