Home Affordability: How Much House Can You Buy? & Free Calculator
Key Takeaways
- The 28/36 rule says your housing costs shouldn't exceed 28% of gross income, and total debts shouldn't exceed 36% — this is what lenders use to qualify you.
- The maximum a lender approves and the amount you can comfortably afford are often very different numbers. Lenders don't know your lifestyle, goals, or risk tolerance.
- Property taxes, insurance, HOA fees, maintenance, and PMI can add 30-50% to your base mortgage payment — many first-time buyers are shocked by the real monthly cost.
- A 20% down payment eliminates private mortgage insurance (PMI), which typically adds $100-300/month to your payment.
- Your debt-to-income ratio (DTI) is the single biggest factor lenders use after credit score — paying off a car loan or credit card before applying can significantly increase your borrowing power.
Buying a home is the largest financial decision most people make, and the question "how much house can I afford?" is deceptively complex. A lender might approve you for a $400,000 mortgage, but that doesn't mean you should borrow $400,000. Lenders look at your income, debts, and credit score — they don't look at your childcare costs, student loan ambitions, retirement savings goals, or desire to take vacations. The maximum you qualify for and the maximum you can comfortably afford are often tens of thousands of dollars apart.
The standard that most mortgage lenders use is the 28/36 rule. The "28" means your monthly housing costs (mortgage principal, interest, property taxes, and insurance — known as PITI) should not exceed 28% of your gross monthly income. The "36" means your total monthly debt payments (housing plus car loans, student loans, credit cards, and other obligations) should not exceed 36% of gross income. Some lenders allow higher ratios — up to 43% or even 50% for certain loan programs — but stretching to those limits leaves very little financial breathing room.
The hidden costs of homeownership catch many first-time buyers off guard. Beyond the mortgage payment, you'll pay property taxes (which can range from 0.5% to over 2% of home value annually), homeowner's insurance ($1,000-3,000+/year depending on location), and potentially HOA fees ($200-500+/month for condos and planned communities). Maintenance and repairs typically cost 1-2% of the home's value per year. If your down payment is less than 20%, you'll also pay PMI (private mortgage insurance), which adds $100-300/month until you build 20% equity. All of these costs stack on top of your principal and interest payment.
Interest rates play a massive role in affordability. At 6.5%, a $300,000 30-year mortgage costs about $1,896/month in principal and interest. At 4.5%, the same loan costs $1,520 — a $376 difference that translates to qualifying for roughly $50,000 more house at the same income level. This is why rising rates cool the housing market and falling rates heat it up. When rates change by even 1%, it shifts the entire affordability equation for millions of buyers.
Affordability Calculator
Affordability Score ($85K Income)
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About the Home Affordability Calculator
A home affordability calculator helps you determine how much house you can realistically afford. Based on your income, debts, down payment, and current interest rates, it uses the standard 28/36 debt-to-income (DTI) rule that most lenders follow.
Quick Start Guide
- Enter your values — Fill in the fields with numbers relevant to your home affordability calculation. Most fields include sensible defaults.
- Adjust settings — Change options like units, rates, or timeframes to match your specific scenario.
- Review results — The output shows a clear breakdown so you understand how the total was calculated.
How It Works
Front-end DTI (28%): housing costs (PITI) should not exceed 28% of gross monthly income. Back-end DTI (36%): total debts including housing should not exceed 36% of gross income. The calculator also accounts for PMI, property taxes, and homeowner's insurance.
Current Market Data
| Metric | Value | Source | Date |
|---|---|---|---|
| Median US Home Price | $412,000 | NAR / Zillow | Q1 2026 |
| Median 30-Year Fixed Rate | 6.50% | Freddie Mac PMMS | June 2026 |
| Median Household Income | $80,610 | US Census Bureau | 2025 |
Real-World Example
Scenario: Determining affordability with $90,000 annual income
- Annual income: $90,000 ($7,500/month).
- Down payment: $40,000 saved.
- Monthly debts: $450 (car loan + credit cards).
- Interest rate: 6.5% APR.
Who Is This For?
This home affordability calculator is designed for Home buyers and investors comparing purchase scenarios, evaluating affordability, and understanding the true cost of homeownership.. It's intentionally simple — no complex signup forms, no data tracking, no distractions. Just enter your numbers and get the answer.
Pro Tip
Factor in all costs of ownership — property taxes, insurance, maintenance, and HOA fees — not just the mortgage payment.
Things to Know
The home affordability calculator provides instant, accurate results based on standard formulas and the values you enter. Whether you are planning a financial decision, tracking a health metric, or solving a practical problem, this tool gives you the numbers you need without requiring signup or account creation.
How to get the best results: Use accurate, up-to-date inputs for the most reliable calculations. When planning ahead, run multiple scenarios with different assumptions to understand the range of possible outcomes.
Note: This tool is designed for educational and planning purposes. For critical financial, medical, or legal decisions, always verify the results with a qualified professional who can evaluate your specific circumstances.
Download Resources
Free templates and worksheets to help you get the most from this tool.
Sources & References
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Frequently Asked Questions
Can I buy a home if I have student loans?
Yes. Student loan payments are included in your debt-to-income calculation. The lender will use your minimum monthly payment (or 0.5% of the balance if no payment is required). Focus on keeping your total DTI below 43% for most loan programs.
How accurate are the results?
Results are based on standard formulas and the values you enter. They are accurate for educational and planning purposes.
Is this tool really free?
Yes, completely free. No signup, no hidden charges, no usage limits. Use it as often as you need.
Can I share the results?
Yes. You can take a screenshot or share the page link with anyone. The tool works the same for everyone.
What This Calculator Shows
This calculator works backward from your income and debts to determine the maximum home price you can afford under the 28/36 rule. It accounts for property taxes and insurance (which many calculators ignore), shows your debt-to-income ratios, and breaks down your monthly payment into its components. The gauge visualization shows whether your affordability situation is tight, moderate, or comfortable — helping you make a realistic decision rather than stretching to the maximum.
How the Home Affordability Formula Works
Enter your annual household income before taxes, your down payment amount, and your monthly debt payments. Enter the interest rate and loan term, plus annual property taxes and homeowner's insurance.
The calculator applies the 28/36 rule: your monthly housing costs should not exceed 28% of your gross monthly income (front-end ratio), and your total debt payments should not exceed 36% (back-end ratio).
Home Affordability Formula
Back-End Limit = (Monthly Income - Monthly Debts) x 0.36
Your maximum monthly payment is the lower of these two limits. The calculator then works backward using the standard amortization formula to determine the maximum loan amount.
DTI Ratio: What Lenders Actually Look At
Your debt-to-income ratio (DTI) is the percentage of your gross monthly income that goes to debt payments. Lenders calculate two versions:
- Front-end DTI (housing ratio) — Just your housing costs (PITI) divided by gross monthly income. Most lenders want this under 28%.
- Back-end DTI (total debt ratio) — All monthly debt payments (housing + car + student loans + credit cards + minimums) divided by gross monthly income. Most lenders want this under 36%, though some programs allow up to 43-50%.
A lower DTI means more borrowing power and better loan terms. Paying off a $400/month car loan before applying for a mortgage could increase your maximum home price by $40,000-60,000.
Down Payment: How Much Do You Really Need?
The down payment is often the biggest barrier to homeownership. Here's how different amounts affect your purchase:
- 20% down — Eliminates PMI, gives you the best rate, and shows lenders you're a low-risk borrower. On a $300,000 home, that's $60,000.
- 10% down — Still a strong position. You'll pay PMI ($100-200/month) until you reach 20% equity, but you keep more cash for emergencies and moving costs.
- 3-5% down — Conventional loans allow this. PMI is higher, and you may pay a slightly elevated rate. But you get into a home years sooner.
- 3.5% down (FHA) — Government-backed loans for buyers with lower credit scores or savings. PMI lasts the life of the loan (refinance out when you can).
- 0% down (VA/USDA) — Available to veterans (VA) or in rural areas (USDA). No PMI, but eligibility requirements are specific.
The True Monthly Cost of Homeownership
Your mortgage payment is just the beginning. A realistic monthly budget for a $300,000 home might look like:
- Principal & Interest: ~$1,610 (at 6.5%, 30-year)
- Property Taxes: ~$300/month
- Homeowner's Insurance: ~$100/month
- PMI (if <20% down): ~$150-250/month
- Maintenance Reserve: ~$250/month (1% of value annually)
- HOA (if applicable): $0-500/month
- Total: ~$2,310-3,010/month
That's $700-1,400 more than the base mortgage payment alone. Budget for the full picture, not just the principal and interest.
Frequently Asked Questions
Next Steps
Prepare for your home purchase strategically:
- Get pre-approved, not just pre-qualified. A pre-approval letter from a lender carries real weight with sellers and tells you exactly what you can borrow. It requires a credit check and income verification.
- Reduce your DTI before applying. Pay off small debts (car loans, credit cards) to increase your borrowing power. Even eliminating a $200/month payment can qualify you for $30,000+ more in mortgage.
- Use the calculator to set a realistic budget. Input your actual income and debts to find your true maximum. Then consider buying below that maximum to leave room for unexpected expenses, savings, and quality of life.
- Shop multiple lenders. Mortgage rates and terms vary significantly between lenders. Get quotes from at least 3-4 sources: a big bank, a credit union, an online lender, and a mortgage broker.
- Budget for closing costs. These typically run 2-5% of the purchase price. On a $300,000 home, that's $6,000-15,000 due at closing on top of your down payment.