Use the conversion factor: 1 eV = 1.602176634 × 10^-19 J
Convert joules to electronvolts with: eV = J ÷ 1.602176634 × 10^-19
Equivalent form: eV = J × 6.241509074 × 10^18
For a value in joules, divide by 1.602176634 × 10^-19 to get electronvolts
Example: 1 J = 6.241509074 × 10^18 eV