Mortgage Calculator - Version 1.1 The more efficient and user-friendly a mortgage calculator is, the better it is for end users. End users can be first time mortgage applicants, real estate brokers, seminar speakers and retirees who own real estate and are thinking of refinancing their existing mortgages. Whatever the purpose - foreclosures, flipping, fixer-uppers, notes - mortgage calculator plus is the smartest tool to have.You simply key in six types of information: loan amount (principal), interest rate, term (or amortization period), start date of the mortgage, property tax, and insurance, if applicable. After you enter the required data, it calculates your monthly repayments in seconds.Changed your mind and want to reduce the term from 25 to 20 years? Replace the 25 years with 20 and it re-calculates the figure in seconds! It shows how much of your monthly payments go to the principal amount and to interest. This way you keep track of your interest payments if you wish to claim certain tax deductions in the future.