How much house can I afford is really two different questions: what will a lender approve you for, and what can you actually afford comfortably. Use the calculator below to get your real number, then read on to understand exactly how it works.
What's Inside
The Affordability Calculator
Enter your numbers below to get an estimated maximum home price based on the same 28/36 rule lenders use as a starting point.
How Much House Can I Afford?
All fields are estimates. Adjust them to match your real numbers.
Estimate only, based on the 28/36 rule. Your actual approval depends on a full lender review.
How much house can I afford is the question every buyer types into Google before ever talking to a lender, and the honest answer has two parts: the number a lender's formula will approve, and the number that actually fits your life without stretching your budget thin.
This guide covers both, plus the calculator above to get your real starting point.
Quick honesty note
This is education, not a loan offer. The calculator above uses the standard 28/36 affordability rule and reasonable default assumptions, not your actual credit profile or a specific lender's underwriting.
Get a real pre-approval before treating any number here as final.
The Short Answer
In short: Most lenders cap your total monthly housing payment at around 28% of your gross monthly income (the front-end ratio) and your total debt payments, including housing, at around 36% (the back-end ratio).
The lower of those two numbers, adjusted for your down payment, interest rate, taxes, and insurance, sets your realistic maximum home price.
The 28/36 Rule Explained
- The front-end ratio (28%). Your total housing payment, principal, interest, taxes, insurance, and HOA combined, should not exceed roughly 28% of your gross monthly income.
- The back-end ratio (36%). Your total monthly debt, housing plus car loans, student loans, credit cards, and any other recurring debt, should not exceed roughly 36% of your gross monthly income.
Lenders actually use whichever number is more restrictive for you. If you carry meaningful other debt, your back-end ratio often becomes the real limit on your housing budget, not the front-end number alone, which is exactly why the calculator above checks both.
Lender-Approved vs Comfortably Affordable
Many loan programs allow a back-end ratio well above 36%, sometimes up to 43%, and occasionally as high as 45% to 50% with strong compensating factors like a large down payment or significant reserves.
That means a lender may approve you for meaningfully more than the 28/36 rule suggests.
A more conservative target, sometimes called the 25% rule, caps your housing payment at 25% of your monthly take-home (after-tax) pay rather than gross income, leaving more room for savings, emergencies, and everything else life throws at you.
If your job security, other financial goals, or risk tolerance lean cautious, treat the calculator's output as a ceiling, not a target.
What Actually Makes Up Your Payment
Your full monthly housing cost is commonly called PITI:
- Principal — the portion that pays down your loan balance.
- Interest — the cost of borrowing, which is highest early in the loan and shrinks over time.
- Taxes — property taxes, often collected monthly by your lender and held in escrow.
- Insurance — homeowners insurance, and mortgage insurance (PMI or MIP) if your down payment is below the threshold that avoids it. See conventional vs FHA loan.
HOA dues, if applicable, are not technically part of PITI but function the same way in your budget, and the calculator above includes them for that reason.
How Your Down Payment Changes the Number
A larger down payment increases your maximum home price in two ways: it directly reduces how much you need to finance, and it can eliminate mortgage insurance once you clear 20% down on a conventional loan, freeing up more of your monthly budget for principal and interest instead.
Try adjusting the down payment field in the calculator above to see how much this single number moves your result. For the full range of low-down-payment options if 20% feels out of reach, see how to finance real estate.
Common Mistakes (and How to Dodge Them)
- Using only the lender-approved maximum. The largest number you qualify for is rarely the smartest number to actually spend.
- Forgetting taxes and insurance. These can add hundreds a month beyond principal and interest, especially in higher-tax areas.
- Ignoring existing debt. A car payment or student loans can lower your real housing budget more than people expect.
- Not leaving room for maintenance and reserves. Affordability calculators do not include ongoing upkeep, which is a real cost on top of PITI.
- Assuming the calculator output is guaranteed. It is an estimate. A full pre-approval considers your actual credit, employment, and documentation.
Frequently Asked Questions
How much house can I afford based on my salary?
A common starting point is the 28/36 rule: your total housing payment should not exceed roughly 28% of your gross monthly income, and your total debt payments, including housing, should not exceed roughly 36%. Use the calculator above with your actual income, debts, and down payment to get a personalized estimate.
What is the 28/36 rule for home affordability?
The 28/36 rule caps your housing payment at 28% of gross monthly income (the front-end ratio) and your total monthly debt, including housing, at 36% (the back-end ratio).
Lenders use whichever ratio is more restrictive for your situation, which is why carrying other debt can meaningfully lower your real home-buying budget.
Should I spend the maximum amount a lender approves me for?
Not necessarily. Many loan programs approve back-end ratios well above 36%, sometimes up to 43% to 50% with strong compensating factors, but a larger approved amount does not account for savings goals, job security, or comfort.
A more conservative target, capping housing at around 25% of take-home pay, leaves more room for everything else in your budget.
What does PITI mean in a mortgage payment?
PITI stands for principal, interest, taxes, and insurance, the four components that typically make up your full monthly housing payment.
Principal and interest pay down and service your loan, while taxes and insurance (including mortgage insurance if applicable) are often collected monthly and held in escrow by your lender.
How does my down payment affect how much house I can afford?
A larger down payment directly reduces how much you need to finance, and on a conventional loan, reaching 20% down eliminates private mortgage insurance, freeing up more of your monthly budget for principal and interest. Both effects increase your maximum affordable home price for the same monthly payment.
Is this calculator the same as mortgage pre-approval?
No. This calculator gives an estimate based on the 28/36 affordability rule and the assumptions you enter. Mortgage pre-approval is a formal process where a lender verifies your credit, income, assets, and debts and issues a written conditional commitment for a specific loan amount.
Use this calculator to set expectations, then get pre-approved before house hunting seriously.
Know Your Number Before You Start Looking
How much house you can afford is not one fixed number, it is a range between what a lender will approve and what you can actually live with comfortably.
Use the calculator above to find your starting point, respect the more conservative ratio when your debts or goals call for caution, and confirm everything with a real pre-approval before you start touring homes.
Take This Further
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Keep learning: how to get pre-approved for a home loan · conventional vs FHA loan · how to finance real estate · first-time home buyer guide · closing costs explained.
Education only, not financial advice or a loan offer. The calculator above provides an estimate based on the 28/36 affordability rule and general assumptions, not a specific lender's underwriting or your full credit profile. Interest rates, property tax rates, and insurance costs vary by location and change over time. Get a formal pre-approval from a licensed lender before treating any figure here as final.
Written by
Nwaeze David
Nigerian digital entrepreneur, educator and author of three real estate books. He writes practical, honest guides for new investors, working realtors and Africans building back home from abroad.
