Do you have a 30-year mortgage? A 15-year mortgage? Not everyone knows this, but you can pay them off much sooner than the names suggest. How? Just increase the amount you are paying toward your mortgage payment and note the additional amount you want applied to your principle in the memo section of your check (or in the additional comments section if paying via Online Banking). Use this calculator to find out how much faster you can pay off your loan and how much money you might save on interest charges over the long haul.