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 Electronvolts
Convert Femtojoule (fJ) to Electronvolt (eV) instantly with an exact formula, conversion table, and FAQ.
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Convert femtojoules (fJ) to electronvolts (eV) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
An electronvolt (eV) is the energy gained by a single electron accelerating through a potential difference of one volt, widely used in atomic and particle physics.
eV = fJ × 6241.509074
Results update instantly for Femtojoules to Electronvolts conversions.
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Formula
eV = fJ × 6241.509074
fJ = eV × 0.0001602176634
Conversion table
| 1 fJ | 6241.509074 eV |
| 5 fJ | 31207.545372 eV |
| 10 fJ | 62415.090745 eV |
| 20 fJ | 124830.181489 eV |
| 50 fJ | 312075.453723 eV |
| 100 fJ | 624150.907446 eV |
| 500 fJ | 3.120755e+06 eV |
| 1000 fJ | 6.241509e+06 eV |
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How the formula works
Both femtojoule and electronvolt measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in femtojoules by 6241.509074 to get electronvolts. To reverse the conversion, multiply a electronvolt value by 0.0001602176634 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 Electronvolt (eV)?
An electronvolt (eV) is the energy gained by a single electron accelerating through a potential difference of one volt, widely used in atomic and particle physics.
How do I convert femtojoules to electronvolts?
Multiply the femtojoule value by 6241.509074 to get the equivalent in electronvolts. For example, 5 fJ × 6241.509074 = 31207.545372 eV.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 6241.509074 is an exact, non-rounded value.
Can I convert electronvolts back to femtojoules?
Yes. Divide the electronvolt value by 6241.509074, or multiply it by 0.0001602176634, to get femtojoules.
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About converting femtojoules to electronvolts
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. An electronvolt (eV) is the energy gained by a single electron accelerating through a potential difference of one volt, widely used in atomic and particle physics.
Use this calculator to move between femtojoules and electronvolts accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.