How much can I afford for a mortgage?—this is the first question most home-buyers ask themselves. To help answer this, our Mortgage Affordability Calculator is a great starting point. The calculator helps determine how much you can afford based on your yearly income—along with the income of anyone else purchasing a home with you and your monthly expenses. To get the most accurate result, make sure to indicate all of the figures for your monthly expenditures. Our Mortgage Affordability Calculator applies the federal lending rules most lenders use in assessing mortgage suitability to give you a realistic snapshot of your financial picture, showing how much you can afford to spend on your picture-perfect home.