There may also be other fees (generally levied when the mortgage is taken out) that become part of the initial principal. These fees are considered part of the mortgage and not add-ons.
Every mortgage payer should know how much of their monthly payment goes toward the principal/interest and how much of the payment is fees. There are a few ways you can determine how much of your payment actually goes toward your mortgage:
The Mortgage Calculators have no way of knowing what fees you are paying with your mortgage and computes your mortgage given the precise information you provide. Because these fees do not go toward the actual mortgage interest and principal, they must be subtracted from the "Total Monthly Mortgage Payment" entry to correctly compute the principal paid with each payment. If your mortgage payment includes such fees and you don't enter them in the "Fees Included in Monthly Payment" entry, the Mortgage Calculators will compute your payments incorrectly. The result will be that the computed payout will appear to be years before the acutal payout.
For computation, the Mortgage Calculators subtract the fees from your total payment. When writing results, the Mortgage Calculators add these fees back into the computed monthly payments so that the "payment" column in the reports show the total payment required to retire the mortgage.