Estimate how much home you can afford based on your income, debts, and down payment.
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Buying a home is one of the largest financial decisions you will ever make. Before you fall in love with a listing, it pays — literally — to know exactly how much house you can afford. Our Home Affordability Calculator takes your gross income, existing debts, down payment, interest rate, property taxes, and insurance into account to give you a realistic maximum purchase price and a full monthly payment breakdown in seconds.
How to Use This Home Affordability Calculator
Fill in each field using the information below as your guide, then click Calculate Affordability. Results appear instantly below the form, showing your maximum home price, estimated monthly payment, and both front-end and back-end debt-to-income (DTI) ratios — the two key metrics lenders use to approve mortgages.
Understanding Each Input
Annual Gross Income: Enter your total household income before taxes. If you are applying with a co-borrower such as a spouse or partner, add both incomes together. Lenders base affordability on gross (pre-tax) income, not take-home pay.
Monthly Debt Payments: Include the minimum monthly payments on all recurring obligations — auto loans, student loans, personal loans, and credit card minimums. Do not include utilities, groceries, or subscriptions. This figure directly affects your back-end DTI ratio.
Down Payment: The amount of cash you plan to bring to closing. A larger down payment reduces your loan amount, lowers monthly payments, and — if you reach 20% of the purchase price — eliminates the need for Private Mortgage Insurance (PMI).
Interest Rate: Use the current average for the loan type you are targeting. Check with lenders or sites like Freddie Mac’s Primary Mortgage Market Survey for the latest benchmark rates. Even a 0.25% difference can shift your maximum home price by thousands of dollars.
Loan Term: Most buyers choose a 30-year fixed mortgage for its lower monthly payment. A 15-year loan carries a higher monthly payment but builds equity faster and typically comes with a lower interest rate.
Annual Property Tax Rate: Property tax rates vary widely by state and county, ranging from roughly 0.3% in Hawaii to over 2% in New Jersey. Check your target area’s county assessor website or ask a local real estate agent for a realistic estimate.
Annual Home Insurance: Homeowners insurance is required by virtually all mortgage lenders. The national average hovers around $1,200–$2,000 per year for a median-priced home, though coastal, flood-prone, and high-risk areas can be significantly higher.
Target DTI Ratio: The DTI (Debt-to-Income) ratio compares your housing costs to your gross monthly income. The 36% standard is a conservative, widely accepted benchmark. FHA loans allow up to 43%, and some conventional loans go to 45% with strong compensating factors like excellent credit or significant reserves.
Reading Your Results
Once you calculate, the results panel shows nine key figures:
- Maximum Home Price — the highest purchase price supported by your inputs within the chosen DTI.
- Maximum Loan Amount — home price minus your down payment.
- Monthly P&I Payment — principal and interest only, the core mortgage payment.
- Monthly Property Tax — estimated based on your tax rate and calculated home price.
- Monthly Home Insurance — your annual premium spread over 12 months.
- Total Monthly PITI — Principal, Interest, Taxes, and Insurance combined. This is what lenders compare to your income.
- Down Payment Percentage — shows whether you reach the 20% threshold to avoid PMI.
- Front-End DTI — housing costs as a percent of gross income. Most lenders prefer this below 28%–31%.
- Back-End DTI — all debts plus housing as a percent of gross income. The chosen DTI limit applies here.
Frequently Asked Questions
What DTI ratio do most mortgage lenders require?
Most conventional lenders prefer a back-end DTI of 36% or lower, though Fannie Mae and Freddie Mac guidelines allow up to 45% with compensating factors such as a high credit score or substantial cash reserves. FHA loans cap the back-end DTI at 43% for standard approval. The lower your DTI, the stronger your application appears to underwriters.
How does my down payment affect what I can afford?
A larger down payment reduces the loan amount, which lowers your monthly principal and interest payment. This means a portion of your housing budget is freed up, allowing you to afford a higher purchase price within the same DTI limit. Additionally, reaching 20% down eliminates PMI — a cost that typically runs 0.5% to 1.5% of the loan per year — further improving your monthly cash flow.
Does this calculator account for Private Mortgage Insurance (PMI)?
The calculator alerts you when your down payment is below 20% of the calculated home price, indicating PMI will likely apply. However, PMI is not added to the payment totals automatically because rates vary by lender, credit score, and loan type. As a rule of thumb, budget an extra 0.5% to 1.5% of your loan amount annually for PMI until you reach 20% equity.
Should I use gross or net income in the calculator?
Always use gross income — your earnings before federal, state, and payroll taxes are deducted. Mortgage lenders base all qualifying ratios on gross monthly income, not take-home pay. Using net income will understate what you qualify for and produce a maximum home price that is lower than what most lenders would actually approve.
What other costs should I budget for beyond PITI?
Your PITI payment is just the beginning of homeownership costs. Plan for HOA fees (common in condos and planned communities), routine maintenance (budget 1% of home value per year), utilities, and potential PMI. Closing costs typically run 2%–5% of the purchase price and are due at settlement. A thorough budget accounts for all of these in addition to your monthly mortgage payment.