This document provides a mortgage calculator that allows a user to input a purchase price, down payment, and loan adjustments to calculate the mortgage amount, interest rate over a set number of years, principal and interest payment, and amortization schedule showing the breakdown of principal and interest over the life of the loan. An example is provided showing the calculations for a $500,000 purchase price with a $20,000 down payment and $3,000 loan adjustments resulting in a $483,000 mortgage amount at 5% interest over 20 years.