A reversible mortgage calculator is, therefore, a product that enables homeowners, especially those who are 62 years old... moreA reversible mortgage calculator is, therefore, a product that enables homeowners, especially those who are 62 years old and above, to get cash from their homes while they continue living there. A reverse mortgage is not the same as a more common mortgage, in which the homeowner pays a lender on a monthly basis, but rather, it is a mortgage in which the homeowner receives checks from the lender.