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.
Electronvolts to Femtojoules
Convert Electronvolt (eV) to Femtojoule (fJ) instantly with an exact formula, conversion table, and FAQ.
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Convert electronvolts (eV) to femtojoules (fJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
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.
fJ = eV × 0.0001602176634
Results update instantly for Electronvolts to Femtojoules conversions.
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Formula
fJ = eV × 0.0001602176634
eV = fJ × 6241.509074
Conversion table
| 1 eV | 0.000160 fJ |
| 5 eV | 0.000801 fJ |
| 10 eV | 0.001602 fJ |
| 20 eV | 0.003204 fJ |
| 50 eV | 0.008011 fJ |
| 100 eV | 0.016022 fJ |
| 500 eV | 0.080109 fJ |
| 1000 eV | 0.160218 fJ |
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How the formula works
Both electronvolt and femtojoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in electronvolts by 0.0001602176634 to get femtojoules. To reverse the conversion, multiply a femtojoule value by 6241.509074 to get back to electronvolts.
Frequently asked questions
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.
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.
How do I convert electronvolts to femtojoules?
Multiply the electronvolt value by 0.0001602176634 to get the equivalent in femtojoules. For example, 5 eV × 0.0001602176634 = 0.000801 fJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 0.0001602176634 is an exact, non-rounded value.
Can I convert femtojoules back to electronvolts?
Yes. Divide the femtojoule value by 0.0001602176634, or multiply it by 6241.509074, to get electronvolts.
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About converting electronvolts to femtojoules
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. 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.
Use this calculator to move between electronvolts and femtojoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.