Mortgage rates today stepped higher on the long term and lower on the short. Refinance interest ratesYahoo Finance mortgage calculatorA mortgage calculator can help you see how various mortgage term lengths and interest rates will affect your monthly payments. The Yahoo Finance mortgage calculator also considers factors like property taxes and homeowners insurance when calculating your estimated monthly mortgage payment. 30-year vs. 15-year fixed mortgage ratesAs a general rule, 15-year mortgage rates are lower than 30-year mortgage rates. When comparing 15- versus 30-year mortgage rates, know that the shorter term will save you money on interest in the long run.