Calculate your mortgage payments by using a simple mortgage calculator
Here are some good links to calculate your mortgage payments:
Is it smart to pay extra principal on mortgage?
Making extra payments toward your principal balance on your mortgage loan can help you save money on interest and pay off your loan faster. If you want to make extra payments on your mortgage, budget extra money each month to put toward your principal balance.
USDRE Guide to Buying a Home
USDRE Guide to Selling a Home