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