About UsMortgage calculators are used to help homeowners choose the best payment options for their specific needs. This valuable tool can assist the homeowner at the beginning of the mortgage process-choosing a payment plan-and also later in the process, when they want to refinance their loan due to a change in interest rates. The calculator allows homeowners to enter varying loan amounts, interest rates, and payback time frames to formulate the payment plan that will best suit their financial situation. For example, if a homeowner knows what he/she can make in payments each month and what payback time frame they would prefer, the mortgage rate calculator can determine what interest rate they can or can't afford. You can see that to refinance when interest rates change could potentially lower your payments or alter your payback period.