You can use an online mortgage pre-qualification tool to find out what you can afford to spend. Simply input a few pieces of information, and the calculator will instantly tell you how much you can afford.  To get a more accurate idea of how much you can get approved for, consider getting pre-approved for a mortgage. In this case, your lender will assess the financial information you provide and will inform you of the maximum loan amount you can get, as well as the interest rate you’ll be offered.