Amortization calculator will show you how much principle you've paid and how much total interest you have paid after any given payment. This calculator will also show you the total monthly payment to on any loan or mortgage when you input the total principle borrowed, the interest rate you are with it at and the number of payments you will be paying over the course of the loan or mortgage. Optionally, you can enter a number which will represent the last payment made after which the calculator will show you how much principle has been paid altogether to this point on the loan or mortgage and how much total interest has been paid to this particular point. This all takes place in a split second. This calculator is free and can be installed on your desktop for easy reference at any time.