Your credit score is based on all the information in your credit report. This information is converted into a number -- a credit score -- that the lender uses to determine whether you are likely to repay your loan in a timely manner. The scores used in mortgage lending are typically in the 300 to 900 range. A general guide is that the higher your score the better. But you should keep in mind that your credit score is just one of several factors that will be used to evaluate your mortgage loan application.