Answer: Definition of 'Net Asset Value - NAV' A mutual fund's price per share or exchange-traded fund's (ETF) per-share value. In both cases, the per-share dollar amount of the fund is calculated by dividing the total value of all the securities in its portfolio, less any liabilities, by the number of fund shares outstanding. http://www.investopedia.com/terms/n/nav.asp#axzz1pf1FpuCp