How much is 4220 São Tomé and Príncipe Dobra to Eritrean Nakfa? 2.84 Eritrean Nakfa is todays conversion result. International currency exchange rate for pair STD to ERN for today is 0.0007. CNV.to is using the latest data from authority sources, data updates every minute. To calculate reversed currencies go to - 4220 ERN to STD.