Abacre Mortgage Loan Calculator The Abacre Mortgage Loan Calculator can effectively solve the most common mortgage loan analysis and optimization cases: What is my monthly mortgage payment? What is the maximum amount I can borrow on my mortgage? How many years will I pay off the mortgage? The online edition of the program also allows you to calculate monthly and annual mortgage payment amortization tables and provides detailed loan information with schedules. The program is easy to use and free.