Down Payment:  

Amount Financed:  
Monthly Payment:  (Principal & Interest ONLY) 
Since you put less than 20% down, you will pay Private Mortgage Insurance. PMI tends to be about $55 per month for every $100,000 financed (until you have paid off 20% of your loan). This adds to your monthly payment. 

Your property tax rate is per $1000. Your home's assessed value is . This means that your yearly property taxes will be , or per month. 
Mortgage (Principal & Interest)  
PMI  
Property Tax  
Condo Fee  
Total Monthly Payment 
To figure out the monthly payment, we need to know (1) how much you're financing; (2) your monthly interest rate; and (3) how many months you're financing for.
Financials are typically quoted in yearly or annual numbers—a 30year mortgage or a 6% annual interest. However, you pay your mortgage every month. A lot of the calculations involve translating those yearly numbers to their monthly equivalents.
First, we need to figure how much you're financing.
We can do this based on the sale price of the home () and the percent that you put down (%).
Start by calculating the down payment. Divide the percentage down by 100, then multiply by the sale price of the home.
(% / 100) x = , your down payment
Now we can calculate how much you're financing—how much you need to borrow. That's just the sale price minus your down payment.
 = , your financing price
That % interest rate percentage you secured is an annual percent.
We'll need to convert that from a percentage to a decimal rate, and from an annual representation to a monthly one.
First, let's convert it to a decimal, by dividing the percent by 100.
% / 100 = , the annual interest rate
Now convert the annual rate to a monthly rate by dividing by 12 (for 12 months in a year).
/ 12 = , your monthly interest rate
Now for an easy calculation—the month term. That's just the number of months you'll be paying off your loan.
You have a year mortgage x 12 months = months, your month term.
Using the three numbers above, we can now calculate your monthly payment.
(financing price) x (monthly interest rate / (1  ((1+monthly interest rate)^{(monthly term)})))
x ( / (1  ((1 + )^{()}))) = , your monthly payment*
*Principal & Interest only. See total monthly payment for a your mortgage plus taxes, insurance, and fees. See amortization for a breakdown of how each monthly payment is split between the bank's interest and paying off the loan principal.
Amortization for monthly payment, , over years. Mortgage amortization only includes your monthly principal and interest payments. Property taxes, PMI, and condo fees are ignored when amortizing your mortgage.
Year Summary:
You spent
went to principal
This is equity that your building up


Principal & interest costs for the full years of this mortgage total… 
This mortgage calculator can be used to figure out monthly payments of a home mortgage loan. This calculator automatically factors in PMI for loans where less than 20% is put as a down payment. Also taken into consideration are the town property taxes based on the mortgaged property's assessed valued.
The code for PHP Mortgage Calculator is free and can probably be downloaded from http://davetufts.com