There are several types of mortgages, including 30-year fixed-rate loans, 15-year fixed-rate loans, and adjustable-rate mortgages, where the interest rate changes after every 3 to 5 years.
In addition to your down payment, you will also need to pay closing costs. You may also have to pay appraisal fees and additional fees required by state law.
The last step in calculating how much house you can afford is considering other factors such as property taxes and homeowners insurance rates in your area.