How much is 165.75 British Pound to New Belarusian Ruble? 688.99 New Belarusian Ruble is todays conversion result. International currency exchange rate for pair GBP to BYN for today is 4.1568. CNV.to is using the latest data from authority sources, data updates every minute. To calculate reversed currencies go to - 165.75 BYN to GBP.