Estimate a realistic home-buying budget.
Compare your income, monthly debt, and down payment against the mortgage payment and home price that may fit your budget.
How this mortgage affordability calculator works
Use this calculator to estimate the maximum home price that may fit your monthly cash flow using common housing debt guidelines and your current financing assumptions.
Formula: The tool compares your monthly gross income to a target housing payment using a 28% housing ratio and a 36% total debt ratio, then solves the mortgage amount implied by the remaining monthly payment.
Assumptions: This model assumes a fixed-rate mortgage, a standard monthly loan schedule, and a property tax and insurance estimate based on your inputs. It does not include all lender fees, HOA changes, or special loan programs.
Worked example: A household earning $120,000 a year, carrying $600 in monthly debt, and putting down $40,000 on a 30-year mortgage at 6.5% may qualify for a home price around the $380,000 to $430,000 range depending on taxes and insurance.
- Annual income: Your gross household income before taxes.
- Monthly debt: Car payments, student loans, credit cards, and other recurring obligations.
- Down payment: Cash you contribute toward the home purchase.
- Mortgage rate: The estimated interest rate on the loan.
- Max home price: The purchase price that aligns with a sustainable monthly housing payment.
What the result means
The affordability estimate gives a practical ceiling for a home purchase based on your income and debt obligations. It helps you compare various offers and decide whether a monthly mortgage payment leaves room for savings and lifestyle flexibility.
Related calculators
Budget planner for checking monthly cash flow before a purchase, Loan calculator for reviewing total mortgage cost under a fixed repayment schedule.
Frequently asked questions
- Is this a lender preapproval? No. It is an affordability estimate using standard debt-to-income assumptions and does not replace a formal mortgage qualification review.
- Are taxes and insurance included? Yes, using the rates you enter, but lender fees, maintenance, and utilities are not included unless you add them manually.
Why this estimate matters
Use the Estimate a realistic home-buying budget. to test a realistic scenario before making a financial or health decision. The result is most helpful when you understand the inputs and how a small change in rate, payment, income, savings goal, or time horizon can change the outcome. This makes the calculator useful for planning, comparison, and early decision-making instead of relying on guesswork.
Because every household, budget, and payment schedule is different, the output should be treated as an estimate rather than a promise. Key assumptions like fixed costs, tax treatment, rate changes, or expected returns are built into the model and should be reviewed before making a commitment. When the decision is significant, compare a few scenarios, update the numbers as your situation changes, and consider professional guidance for taxes, debt strategy, mortgage planning, or long-term financial goals.
- Check your assumptions: Replace default values with your real numbers to see how the estimate changes.
- Compare scenarios: Test lower, base, and higher-cost versions of the same decision before finalizing your plan.
- Review trade-offs: A faster payoff or lower payment may affect cash flow, flexibility, or long-term goals.
- Update regularly: Revisit the tool whenever income, rates, costs, or goals change.