The maximum home price you can afford is determined by the 28/36 rule: your monthly housing costs should not exceed 28% of your gross income, and your total monthly debt payments (including housing) should not exceed 36%. For example, if your gross monthly income is $6,000, your maximum housing payment would be $1,680 (28% of $6,000), and your total debt payments should not exceed $2,160 (36% of $6,000). This rule helps lenders and buyers avoid financial strain by ensuring mortgage payments remain manageable alongside other obligations.
Calculating this manually involves multiple steps—factoring in your income, existing debts, down payment, interest rate, and loan term—while also accounting for property taxes, insurance, and potential HOA fees. For most buyers, this process is time-consuming and prone to errors. That’s why using a Home Affordability Calculator is the fastest way to get an accurate, personalized estimate. Instead of guessing or relying on rough estimates, you’ll see exactly how much house you can afford based on your financial situation.
Understanding your affordable home price before you start house hunting saves time and prevents disappointment. It also strengthens your position when making an offer, as sellers and lenders view pre-approved buyers as more serious and reliable. Whether you’re a first-time buyer or upgrading to a larger home, knowing your budget upfront helps you focus on properties within your financial reach. Below, we’ll break down how the 28/36 rule works, how to use the calculator, and what factors influence your affordability.
How the 28/36 Rule Works
The 28/36 rule is a standard guideline used by lenders to assess mortgage affordability. The "28" refers to the front-end ratio: your monthly housing costs (including principal, interest, taxes, and insurance) should not exceed 28% of your gross monthly income. The "36" refers to the back-end ratio: your total monthly debt payments (including housing, car loans, student loans, and credit card minimums) should not exceed 36% of your gross income.
Here’s how it applies in practice:
| Gross Monthly Income | Max Housing Payment (28%) | Max Total Debt (36%) | Example Debt Allowance (Total Debt - Housing) |
|---|---|---|---|
| $5,000 | $1,400 | $1,800 | $400 |
| $7,500 | $2,100 | $2,700 | $600 |
| $10,000 | $2,800 | $3,600 | $800 |
For example, if your gross monthly income is $7,500, your maximum housing payment would be $2,100 (28% of $7,500). If you have $500 in existing monthly debt payments, your total debt allowance is $2,700 (36% of $7,500), leaving $2,200 for housing. In this case, the 28% rule is stricter, so your housing payment would be capped at $2,100. If your debts were lower—say, $300 per month—your total debt allowance would still be $2,700, but your housing payment could increase to $2,400 while staying within the 36% limit.
This rule ensures you don’t overextend yourself, leaving room for savings, emergencies, and other living expenses. Lenders use it to determine loan eligibility, but it’s equally valuable for buyers to assess their own comfort level. If your debts are high, you may need to reduce your housing budget or pay down debts before buying.
Factors That Affect Your Affordable Home Price
Several key factors influence how much house you can afford, even if your income and debts stay the same. Understanding these variables helps you adjust your expectations or improve your affordability before applying for a mortgage.
Down Payment
The larger your down payment, the lower your loan amount—and the more house you can afford. A 20% down payment also helps you avoid private mortgage insurance (PMI), which adds to your monthly costs. For example, a $40,000 down payment on a $200,000 home reduces your loan amount to $160,000, lowering your monthly payment and interest costs.
Interest Rate
Even a small change in interest rates can significantly impact your affordability. For instance, a 30-year loan of $250,000 at 4% interest results in a monthly payment of $1,194 (excluding taxes and insurance). At 5%, the same loan costs $1,342 per month—an extra $148. Over 30 years, that’s $53,280 more in interest. Shopping around for the best rate can save you thousands.
Loan Term
The length of your loan term affects both your monthly payment and total interest paid. A 15-year mortgage has higher monthly payments but lower total interest compared to a 30-year mortgage. For example, a $250,000 loan at 4% interest over 30 years costs $1,194 per month, while the same loan over 15 years costs $1,849 per month—but saves you $97,220 in interest.
Debt-to-Income Ratio (DTI)
Your DTI is the percentage of your gross income that goes toward debt payments. Lenders prefer a DTI below 36%, but some may approve loans up to 43% or higher with strong compensating factors (like a high credit score or large down payment). If your DTI is too high, you may need to pay down debts or increase your income to qualify for a larger loan.
Property Taxes and Insurance
Property taxes and homeowners insurance vary by location and can add hundreds to your monthly payment. For example, a $300,000 home with annual taxes of $6,000 and insurance of $1,200 adds $600 to your monthly housing costs. Always factor these into your budget when calculating affordability.
Calculate Your Affordable Home Price with the Home Affordability Calculator
Instead of manually crunching numbers, use the Home Affordability Calculator to get an instant estimate of your maximum home price. Here’s how to use it:
- Enter your gross income: Input your gross annual or monthly income. For example, if you earn $75,000 per year, enter that amount and select "annual." The calculator will convert it to a monthly figure.
- Add your monthly debts: Include recurring debts like car loans, student loans, and credit card minimums. For example, if you pay $300 for a car loan and $200 for student loans, enter $500.
- Input your down payment: Enter the cash amount you plan to put down. For example, $40,000 for a 20% down payment on a $200,000 home.
- Set your interest rate and loan term: Enter your expected annual interest rate (e.g., 4.5%) and the loan term in years (e.g., 30).
- Review your results: The calculator will display your affordable home price, loan amount, and maximum monthly housing payment based on the 28/36 rule. For example, with a $75,000 income, $500 in debts, a $40,000 down payment, 4.5% interest, and a 30-year term, you might afford a $280,000 home with a $1,600 monthly payment.
This tool eliminates guesswork and helps you set a realistic budget before you start house hunting. It also lets you experiment with different scenarios—like increasing your down payment or paying down debts—to see how they impact your affordability.
What to Do If Your Affordable Price Is Lower Than Expected
If the calculator shows a lower home price than you hoped for, don’t despair. There are several ways to improve your affordability:
- Increase your down payment: Saving more upfront reduces your loan amount and monthly payment. Even an extra $5,000 can make a difference.
- Pay down debts: Reducing your monthly debt payments lowers your DTI, allowing you to qualify for a larger loan. Focus on high-interest debts first.
- Improve your credit score: A higher credit score can help you secure a lower interest rate, which reduces your monthly payment and increases your affordability. Check your credit report for errors and pay bills on time.
- Consider a longer loan term: Extending your loan term from 15 to 30 years lowers your monthly payment, though you’ll pay more in interest over time.
- Look for lower-cost areas: Property taxes, insurance, and home prices vary by location. Expanding your search to nearby neighborhoods or suburbs may help you find a home within your budget.
- Explore first-time homebuyer programs: Many states and lenders offer programs with lower down payment requirements, reduced interest rates, or grants for closing costs. Research options in your area.
If you’re still struggling to afford a home, consider whether now is the right time to buy. Renting for another year or two while saving more or paying down debts could put you in a stronger financial position. For more tips on saving for a home, check out our guide to calculating compound interest on a CD, which can help grow your down payment faster.
How Lenders Use the 28/36 Rule to Approve Mortgages
Lenders use the 28/36 rule to assess your ability to repay a mortgage. During the pre-approval process, they’ll review your income, debts, credit score, and assets to determine your maximum loan amount. Here’s what they look for:
- Stable income: Lenders prefer borrowers with consistent, verifiable income. If you’re self-employed or have variable income, you may need to provide additional documentation, like tax returns or profit-and-loss statements.
- Low DTI: A DTI below 36% is ideal, but some lenders may approve loans up to 43% or higher with strong compensating factors. If your DTI is too high, you may need to pay down debts or increase your income.
- Good credit score: A higher credit score (typically 620 or above for conventional loans) improves your chances of approval and secures a lower interest rate. FHA loans may accept scores as low as 580.
- Sufficient assets: Lenders want to see that you have enough savings to cover your down payment, closing costs, and a few months of mortgage payments in case of emergencies.
If you’re pre-approved for a mortgage, the lender will provide a letter stating the maximum loan amount you qualify for. This letter is essential when making an offer on a home, as it shows sellers you’re a serious buyer. However, just because you’re pre-approved for a certain amount doesn’t mean you should spend that much. Always stick to a budget that feels comfortable for your lifestyle and long-term goals.
For more insights on managing debt, explore our guide to calculating car loan payments, which can help you pay down debts faster and improve your DTI.
Related reading: Calculate Your Loan Payoff Time and Interest in Minutes.
Related reading: Calculate Your Mortgage Payment and Total Interest in One Click.