The mortgage interest rate you’ll receive will depend on the riskiness of your mortgage. This is because lenders charge higher interest rates for riskier loans. For example, loans with smaller down payments and made to borrowers with lower credit scores or weak debt-to-income (DTI) ratios will typically have higher interest rates. One of the best things you can do to qualify for a better mortgage rate is to improve your credit score.  You can estimate mortgage rates by credit score by using a loan savings calculator such as the myFICO tool created by Fair Isaac Corporation. Using information at the time of writing, you can expect to get a 30-year mortgage rate that’s at least 1.5% less if you have a very good FICO score of 760 compared to a fair FICO score of 620. Rates vary by lender, so this is just an estimate.