Giga-electron volts to joules converter on this page calculates how many joules are in 'X' giga-electron volts (where 'X' is the number of giga-electron volts to convert to joules). In order to convert a value from giga-electron volts to joules (from GeV to J) just type the number of GeV to be converted to J and then click on the 'convert' button.