The joule (J) is the SI derived unit of energy, equal to the work done when a force of one newton acts over one meter.
Joules to Electronvolts
Convert Joule (J) to Electronvolt (eV) instantly with an exact formula, conversion table, and FAQ.
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Convert joules (J) 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 = J × 6.241509074e+18
Results update instantly for Joules to Electronvolts conversions.
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Formula
eV = J × 6.241509074e+18
J = eV × 1.602176634e-19
Conversion table
| 1 J | 6.241509e+18 eV |
| 5 J | 3.120755e+19 eV |
| 10 J | 6.241509e+19 eV |
| 20 J | 1.248302e+20 eV |
| 50 J | 3.120755e+20 eV |
| 100 J | 6.241509e+20 eV |
| 500 J | 3.120755e+21 eV |
| 1000 J | 6.241509e+21 eV |
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How the formula works
Both joule and electronvolt measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in joules by 6.241509074e+18 to get electronvolts. To reverse the conversion, multiply a electronvolt value by 1.602176634e-19 to get back to joules.
Frequently asked questions
What is Joule (J)?
The joule (J) is the SI derived unit of energy, equal to the work done when a force of one newton acts over one meter.
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 joules to electronvolts?
Multiply the joule value by 6.241509074e+18 to get the equivalent in electronvolts. For example, 5 J × 6.241509074e+18 = 3.120755e+19 eV.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 6.241509074e+18 is an exact, non-rounded value.
Can I convert electronvolts back to joules?
Yes. Divide the electronvolt value by 6.241509074e+18, or multiply it by 1.602176634e-19, to get joules.
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About converting joules to electronvolts
The joule (J) is the SI derived unit of energy, equal to the work done when a force of one newton acts over one meter. 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 joules 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.