House Affordability Calculator
Estimate the home price you can afford from your income, monthly debts and down payment using standard front-end and back-end debt-to-income limits. The interest rate is your assumption — no live mortgage rate is used.
Written by the CalcBundle Research & Editorial Team · Reviewed by the Quality Review Team · Transparent formulas · results are estimates, not advice. · Updated
Estimated home price you can afford
Enter your annual income and a loan term greater than zero.
What a house affordability calculator does
“How much house can I afford?” is the first question of any home purchase, and the answer is rarely a single obvious number. A house affordability calculator works it out the way a lender does — from your income, your existing debts and your down payment — but it also lets you see how the answer moves as rates, debts and guidelines change. The output is not a promise of approval; it is a well-grounded estimate that turns a stressful, vague question into a concrete price range you can house-hunt within.
How affordability is estimated
- Front-end limit = gross monthly income × front-end DTI
- Back-end limit = gross monthly income × back-end DTI − existing debts
- Housing budget = the lower of the two limits
- Loan = the mortgage that budget supports after taxes, insurance and HOA
- Home price = loan + down payment
Front-end and back-end DTI
Lenders judge affordability through two debt-to-income ratios. The front-end ratio caps your housing payment as a share of gross income; the back-end ratio caps all your debt payments — the new mortgage plus car loans, student loans and credit cards — as a share of income. Your budget is set by whichever limit bites first. For a borrower with little other debt the front-end rule usually governs; for someone carrying loans, the back-end rule does, which is why reducing debt can raise your budget so sharply.
Worked example
Take $8,000 of gross monthly income and a 28/36 guideline. The front-end limit is 28% of $8,000 = $2,240 for housing. The back-end limit is 36% of $8,000 = $2,880 for all debt; if you already pay $600 a month toward a car and loans, only $2,280 is left for housing. The lower figure — about $2,240 — becomes your housing budget. After setting aside part of it for property tax and insurance, the remainder supports a mortgage of a certain size, and adding your down payment gives the affordable price. Clear a $600 debt and the back-end limit jumps to the full $2,880, lifting the price you can buy.
Qualifying vs comfortable
The number a lender will approve and the number you should spend are not the same. DTI limits ignore childcare, retirement saving, travel and how secure your job feels — all of which come out of the same paycheck. Many financially healthy buyers deliberately borrow below their maximum so that a rate rise, a big repair or a change in income does not turn their home into a source of stress. Treat the calculator's figure as a ceiling, then choose your own comfort level beneath it.
Plan the whole purchase
Because the interest rate is an assumption here, model a few rates and down payments to see how sensitive your budget is. Factor in the ongoing bill with the property tax calculator, and once you own, project value with the property appreciation calculator or, if you are buying to let, analyse the numbers with the rental property ROI calculator.
Frequently asked questions
How much house can I afford?
It depends on your income, existing debts, down payment, interest rate and the lending guideline you use. This calculator estimates an affordable home price from front-end and back-end debt-to-income (DTI) limits.
What are front-end and back-end DTI?
Front-end DTI caps housing costs as a percentage of gross income; back-end DTI caps all debt payments, including the new mortgage. The lower of the two limits sets your housing budget. Common guidelines are 28/36, 31/43 and 36/45.
Does the calculator use a real mortgage rate?
No. The interest rate is your assumption — no live rate is fetched. Enter a rate close to current offers to make the estimate realistic, and try a range to see how sensitive affordability is to rates.
Why does my affordable price change with debts?
Existing monthly debts reduce your back-end budget, which often becomes the binding limit. A car loan or student loan payment competes directly with a mortgage payment in the lender's eyes, so paying down debt frees room for a larger mortgage and a higher affordable price — sometimes by far more than the debt payment itself.
How does the down payment change what I can afford?
The down payment adds directly to the price you can buy on top of the loan your income supports, and a larger one can also lower your rate and remove mortgage insurance, stretching your budget further. But it should not drain your emergency fund — being house-rich and cash-poor is a common and avoidable mistake.
Should I borrow the maximum I qualify for?
Usually not. Qualifying for a price and comfortably affording it are different things. Lender DTI limits do not know your childcare costs, savings goals, or how secure your income feels. Many buyers deliberately target a payment below their maximum so a rate rise, a repair or a lean month does not put the home at risk.
What costs beyond the mortgage should I include?
Property tax, homeowner's insurance, and any HOA fees are part of your housing cost and reduce the loan your budget supports — the calculator accounts for them. Beyond those, budget for maintenance (often estimated at around 1% of the home's value a year), utilities, and closing costs at purchase, none of which the mortgage payment covers.
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Disclaimer. This calculator provides estimates for informational purposes only. Results are based on the information you enter and the assumptions used by the calculator. Actual financial, tax, business valuation, lending, marketplace or investment outcomes may differ. Consider consulting a qualified professional for decisions involving significant amounts of money. Estimates only, based on debt-to-income guidelines and the rate you enter. Actual lender criteria, taxes and insurance vary. This is not a loan offer or financial advice.