The NerdWallet home affordability calculator takes into account factors such as your household income, monthly debts, cash reserves for down payment and closing costs, and your credit profile. It uses the Debt-to-Income Ratio (DTI) to determine the home price you can afford. Your credit score and amount of debt you owe also influence a lender's view of you as a borrower. The calculator helps you determine if a home is within your financial reach based on all of your monthly obligations.