How Much House Can I Afford?
The question every home buyer asks first: "How much house can I actually afford?" The answer depends on four things — your income, your existing debts, your available down payment, and the interest rate you qualify for. This calculator uses the Debt-to-Income (DTI) ratio methodology that lenders use to determine your maximum monthly housing payment.
Understanding the DTI Ratio
Your Debt-to-Income ratio is the percentage of your gross monthly income that goes toward debt payments. Lenders look at two DTI ratios: the front-end ratio (housing costs only) and the back-end ratio (all debts). Most conventional loans require a back-end DTI of 43% or less. The "28% rule" suggests keeping housing costs alone below 28% of gross income.
How We Calculate Your Maximum Home Price
Step 1: Maximum monthly housing payment = (Gross Monthly Income × DTI%) − Monthly Debt Payments. Step 2: Subtract estimated taxes and insurance to get max P&I. Step 3: Solve the amortization formula backwards to find the loan amount. Step 4: Add your down payment to get the maximum home price.
Conservative vs. Aggressive Estimates
We show three scenarios: Conservative (28% DTI) leaves room for savings, emergencies, and lifestyle spending. Your Target lets you choose. Aggressive (43% DTI) represents the maximum most lenders will approve — but it leaves little financial cushion and is not recommended for most buyers.
Factors That Affect Your Buying Power
- Credit Score: Affects your interest rate, which directly impacts how much principal you can borrow for the same monthly payment.
- Down Payment: More down = lower loan = more affordable price range.
- Existing Debts: Student loans, car payments, and credit card minimums reduce your available housing payment dollar-for-dollar.
- Interest Rates: A 1% rate increase reduces your buying power by roughly 10%.
Tips to Increase Your Buying Power
- Pay off or down any revolving debt before applying to reduce your DTI.
- Increase your down payment to reduce the required loan amount.
- Improve your credit score (aim for 740+) to qualify for better rates.
- Consider a co-borrower to combine incomes.
- Look at FHA loans (up to 56.9% DTI in some cases) if conventional limits restrict you.
Frequently Asked Questions
Debt-to-Income (DTI) ratio is the percentage of your gross monthly income that goes toward debt payments. Most lenders prefer a DTI of 36% or lower, with a maximum of 43%–50% for qualified mortgages.
The 28% rule suggests your monthly housing payment (PITI) should not exceed 28% of your gross monthly income. The 36% rule extends this to include all debt payments.
Conventional loans typically require 3%–20% down. FHA loans require 3.5%. VA and USDA loans offer 0% down for eligible borrowers. A 20% down payment eliminates PMI.
Monthly debts include minimum credit card payments, student loan payments, auto loan payments, personal loan payments, and any other recurring debt obligations. Do not include utilities, groceries, or subscriptions.
Yes — your maximum home price scales with income. Our calculator uses your gross monthly income and applies your chosen DTI ratio to determine the maximum monthly payment, then back-calculates the affordable home price.
Your credit score affects the interest rate you qualify for. A higher score (740+) typically gets the best rates, which directly increases your affordable home price for the same monthly payment.
A conservative estimate uses a 28% DTI (front-end ratio), while a stretch estimate uses 43% DTI. Most financial advisors recommend staying near the conservative end.
Yes, our affordability calculator includes estimated property taxes (default 1.2% annually) and homeowners insurance in the monthly payment calculation for an accurate PITI estimate.
A mortgage pre-approval is an official lender review of your finances. This calculator provides an estimate. For actual home shopping, get pre-approved with a lender to know your exact limit.
A larger down payment reduces the loan amount, which lowers your monthly payment. This allows you to afford a higher-priced home while keeping payments within your DTI limit.