According to average rates from the Zillow lender marketplace, mortgage rates are mostly on the rise today compared to yesterday. Free mortgage calculatorUse the mortgage calculator below to see how today's interest rates would affect your monthly mortgage payments. The main disadvantage of 30-year fixed mortgage rates is the mortgage interest, both in the short and long term. 15-year fixed mortgage rates: Pros and consThe pros and cons of 15-year fixed mortgage rates are basically swapped with those of the 30-year rates. Today's mortgage rates: FAQsWhy do 30-year mortgage rates vary by the source reporting them?