The following mortgage payment calculator can help you estimate the monthly mortgage payments for your new home, including taxes, insurance and PMI. Here’s the info you’ll need to enter into the mortgage calculator: the home price, the down payment, the loan program (30-year term, 15-year fixed,..), the interest rate, the property tax, and home insurance. You can also display the amortization schedule, which shows you how interest and principal amounts vary over the course of your mortgage payments. Initially, the majority of your mortgage payments consist of interest... over time this shifts to larger portions of the principal amount.