Current and historical price to earnings ratio for Nasdaq (NDAQ) from 2006 to 2018. The price to earnings ratio is calculated by taking the latest closing price and dividing it by the most recent earnings per share (EPS) number. The PE ratio is a simple way to assess whether a stock is over or under valued and is the most widely used valuation measure. The current PE ratio for Nasdaq as of August 24, 2018 is 20.91.