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Online Mortgage Calculator
You can find a lot of online calculators that will help you calculate your mortgage payment. The calculator will amortize your loan over any amount of years you chose with the current interest rate and loan amount.
These types of interest calculators can calculate your borrowing power and help you figure out your debt to income ratio. That will show you if you approve for a mortgage before you go tot he bank.
The amortization schedule on the calculator shows you the amount you pay to principal and interest in each monthly payment. Then you can add extra principal and the mortgage calculator will let you know how much you save on interest per payment and per year.
The only reason you pay a 15 year mortgage in that amount of years instead of a 30 year mortgage is because of the amount of principal. So you can just add that amount of principal to your 30 year mortgage to end up paying it down in the 15 years.
I have a mortgage calculator that offers all of the options on my website. There is a quick and easy one on my home page to give you a fast mortgage payment amount and I also have detailed calculators online to figure out extra principal and different types of interest rates.
Try a few different interest rates as well to figure out how much different each monthly payment ends up being. It might make you shop around for the best interest rate you can find. It really helps give you a lower payment along with paying less interest to the bank over the years. | 
