A mortgage affordability calculator estimates max home price and front/back-end DTI from income, debts, down payment, rate, and housing costs.
This mortgage affordability calculator estimates max home price from gross income, monthly debts, down payment, rate, and housing costs—not a listing-site guess. A how much house can I afford calculator should show front-end DTI (housing payment ÷ income) and back-end DTI (all debts ÷ income) alongside max loan amount. Enter income, debts, taxes, insurance, and HOA; compare to common 28/36 guidelines before you shop lenders. FHA, VA, and jumbo rules differ—use outputs as a planning baseline, not pre-approval.
How much house can you actually afford?
Lenders and listing sites use different DTI caps. Front-end DTI is housing payment divided by gross monthly income; back-end DTI adds car loans, student debt, and minimum card payments. Conventional planning often cites 28% housing and 36% total debt—not a guarantee of approval.
Maxing DTI leaves little room for maintenance (often 1–2% of home value per year), HOA jumps, or rate resets on ARMs. Model a payment below the ceiling so closing does not erase your emergency fund.
Down payment changes PMI, rate tier, and cash at closing—not just loan size. A larger down payment can lower monthly payment more than stretching price at minimum down.
After you bracket price here, compare rent vs buy for your market horizon and run HELOC or refinance tools if you already own and plan to tap equity.
Guide, examples, and methodology
Mortgage affordability calculator
Estimate max home price from gross income, monthly debts, down payment, rate, and DTI targets. Include tax, insurance, and HOA—not P&I alone—for realistic housing payment.
How much house can I afford calculator
Front-end and back-end DTI limits vary by loan program—use this as planning math, not pre-approval.
How to use this mortgage affordability calculator
Enter annual income, monthly debts, down payment, interest rate, loan term, and property tax/insurance/HOA estimates. See a suggested price range using common US debt-to-income guidelines (often 28% housing / 36% total DTI caps for conventional planning).
Example (USD)
Household
Input
Typical guideline
Income
$120,000/year gross
Lenders use gross for ratios
Debts
$500/mo car + cards
Reduces max payment
Down payment
10–20%
Affects PMI and payment
Front-end vs back-end DTI
Front-end (housing) DTI is principal, interest, property tax, insurance, and HOA divided by gross monthly income. Back-end DTI adds minimum payments on car loans, student debt, credit cards, and other obligations. Conventional underwriting often references 28% housing and 36% total, but FHA may allow higher housing ratios with compensating factors and jumbo lenders may require lower ratios. Listing sites sometimes show a price without your full debt picture—always include non-housing payments here.
How we calculate
We back into maximum principal and interest payment from income and debts, add tax/insurance/HOA estimates, and solve for price at your rate and term. FHA, VA, jumbo, and non-QM loans have different rules—this is an educational baseline, not a pre-approval.
PMI, down payment, and rate tiers
Less than 20% down often triggers private mortgage insurance, which raises the housing payment used in DTI. A larger down payment can improve rate tiers and remove PMI sooner than stretching to the maximum price at minimum down. Model a payment below the calculator ceiling so closing costs and moving expenses do not drain your cash reserves.
When to pair with other tools
After you bracket price, compare rent vs buy for your expected tenure in the market. If you already own, run the HELOC payment calculator or refinance savings tool before you assume equity access is cheap. For investment property, use rental cash flow and DSCR tools—owner-occupied DTI rules do not apply.
Common mistakes
Maxing out DTI with no emergency fund after closing.
Forgetting maintenance (often 1–2% of home value per year).
Using today's rates for a purchase 6+ months away.
Comparing online ‘affordability’ to what a lender quotes without shopping.
Lenders often cap housing payment around 28% of gross monthly income and total debt around 36%, though programs vary. Enter your income, debts, and down payment here for an estimate—then confirm with a licensed loan officer.
What is front-end vs back-end DTI?
Front-end DTI is housing costs (P&I, taxes, insurance, HOA) divided by gross monthly income. Back-end DTI adds car loans, credit cards, student debt, and other minimum payments. Many conventional guidelines use 28% front and 36% back, but FHA and other programs allow higher ratios.
Does this include property taxes and insurance?
This model focuses on principal and interest from your rate and term. Real lenders often use PITI (principal, interest, taxes, insurance) in the front-end ratio—add those costs mentally or reduce the DTI limits if your market has high taxes.
Why is my max price lower than online "pre-approval" calculators?
Marketing calculators sometimes assume higher DTI limits, ignore existing debt, or use teaser rates. This tool applies the limits you set and amortizes at your stated APR—adjust front/back-end percentages to match your lender's actual guidelines.