How Much House Can You Afford?
Buying a home is likely the largest financial decision you will ever make, and understanding how much house you can afford before you start shopping is essential. Our Home Affordability Calculator uses your gross income, existing monthly debts, down payment savings, and current mortgage interest rates to estimate the maximum home price you can comfortably finance — without overextending your budget.
Lenders evaluate your application using something called the debt-to-income ratio (DTI). This is the percentage of your gross monthly income that goes toward all monthly debt payments, including the proposed housing payment. Most conventional lenders prefer a total DTI of 36% or below, while FHA loans allow up to 43% in many cases. The lower your DTI, the more financially comfortable your homeownership journey will be.
What Is PITI?
Lenders do not just look at your principal and interest payment when qualifying you for a mortgage — they look at the full PITI figure:
- P — Principal (reducing your loan balance)
- I — Interest (the lender charge for borrowing)
- T — Taxes (monthly escrow for property taxes)
- I — Insurance (homeowner insurance escrowed monthly)
Our calculator accounts for all four components to give you a realistic, lender-standard affordability estimate rather than an optimistic number that ignores real ownership costs.
Understanding the Inputs
Annual Gross Income: Your total pre-tax household income. If buying with a co-borrower, include both incomes.
Monthly Debt Payments: All recurring monthly minimum debt obligations — car loans, student loans, credit card minimums, personal loans. Do not include utility bills or groceries.
Down Payment: The cash amount you plan to put down at closing. A higher down payment reduces your loan amount and may help you avoid private mortgage insurance if it reaches 20% of the purchase price.
Interest Rate: The annual interest rate on your mortgage. Even a 0.5% difference can shift your affordability by tens of thousands of dollars.
Loan Term: A 30-year mortgage offers lower monthly payments but significantly more total interest paid. A 15-year mortgage costs more per month but builds equity faster and saves substantially on interest.
Property Tax Rate: Property taxes vary widely by state and county — from under 0.5% to over 2%. Check your target area effective rate.
Annual Home Insurance: A rough national average is $1,200–$2,000 per year, though coastal or disaster-prone areas can be much higher.
The 28/36 Rule Explained
The classic budgeting guideline for housing is the 28/36 rule: spend no more than 28% of gross monthly income on housing costs (PITI), and keep total monthly debt payments at 36% or below. This rule is the basis for the “standard” DTI setting in our calculator. While some loan programs allow higher ratios, staying within 28/36 gives you breathing room for unexpected expenses, savings, and lifestyle spending.
How to Use This Calculator for Real Decisions
Start by running a conservative scenario using your actual income, existing debts, and realistic rates. Then experiment: What happens if you pay off a car loan before applying? How does saving an extra $10,000 for a down payment change your maximum price? How much does a 0.5% rate difference affect affordability? Is the difference in payment between a 30-year and 15-year mortgage manageable? These scenario comparisons transform this calculator into a strategic planning tool.
What the Calculator Does Not Include
Our affordability calculator gives you a solid baseline, but real-world homeownership involves additional costs: Private Mortgage Insurance (PMI) when your down payment is less than 20%, HOA fees for planned communities or condos, closing costs typically 2–5% of the loan amount, and ongoing maintenance budgeted at 1–2% of the home value per year. Factor these into your overall budget when evaluating your target purchase price.
Frequently Asked Questions
What DTI ratio should I use?
Use 36% for a realistic conventional loan target. If you are exploring FHA financing or have strong compensating factors, 43% may be achievable. The 28% setting reflects the housing-only front-end ratio used by some lenders.
Does this calculator include PMI?
Not automatically. If your down payment is less than 20% of the home price, add an estimated PMI cost to your monthly debts input for a more conservative estimate.
Should I use gross or net income?
Lenders always qualify you based on gross pre-tax income, so use your gross annual income in this calculator. Your actual take-home pay will be lower, which is why advisors often recommend being more conservative than the maximum DTI your lender allows.
How accurate is this estimate?
This calculator provides a close approximation based on your inputs. Actual loan approval depends on your credit score, employment history, asset reserves, the lender, and the loan program. Always get a formal pre-approval from a licensed mortgage lender before making offers.
Related Calculators
- Mortgage Calculator — Calculate your exact monthly payment for a known loan amount
- Loan EMI Calculator — Break down any loan into principal, interest, and schedule
- Debt Payoff Calculator — Plan to eliminate debts before applying for a mortgage
- Budget Planner — Ensure housing fits within your full monthly budget