A fun, simple, straightforward mortgage calculator that allows you to "play" with various mortgage situations. It solves for any one of the four mortgage variables, Principal, Interest, Term, or Payment just by pressing the corresponding button. It also suggests a shorter Term based on increasing the monthly payment by 1/12th the amount, making an extra monthly payment per year, or making 26 biweekly payments per year. Great for Realtors, eliminating the need to carry a phone and a separate financial calculator.