Giga-electron volts to electron volts conversion calculator shown above calculates how many electron volts are in 'X' giga-electron volts (where 'X' is the number of giga-electron volts to convert to electron volts). In order to convert a value from giga-electron volts to electron volts (from GeV to eV) simply type the number of GeV to be converted to eV and then click on the 'convert' button.