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Home Affordability Calculator

Find out how much house you can actually afford — not just what a lender will approve. See the difference between bank maximum and comfortable budget, and what it means for your financial future.

How Much House Can You Afford?

All fields recalculate in real time.

Used for DTI — lenders calculate on gross (pre-tax) income
After taxes — adjust if your actual take-home differs
Car, student loans, credit cards — exclude housing
Default 1.1% — adjust for your area
Optional — enter $0 if no HOA
Comfortable Estimate
—
Keeps you financially flexible
Bank Approval Estimate
—
What a lender will likely approve

Estimates only — for educational purposes. Actual loan approval depends on credit score, employment history, assets, and lender policies. Consult a licensed mortgage professional for accurate pre-approval figures.

How we calculate this ▼
  • Gross income vs take-home: Lenders qualify you on gross (pre-tax) income for DTI calculations. The financial flexibility breakdown uses your actual take-home to show what's left after housing and debts.
  • Bank Approval Estimate: Uses 43% back-end DTI — the standard conventional loan maximum. Max housing payment = (gross monthly × 0.43) − existing monthly debts. The home price is back-solved from this payment limit.
  • Comfortable Estimate: Uses the more restrictive of 28% front-end DTI (housing only) or 36% back-end DTI (housing + all debts). These are the traditional thresholds financial planners use to avoid being house poor.
  • Back-solving for home price: Given a max total monthly payment, we iteratively solve for the home price in 3 passes, accounting for the down payment percentage, property tax, insurance, HOA, and PMI. The result is verified by forward-calculating the monthly payment and confirming it matches the target within $1.
  • P&I formula: M = P × [r(1+r)^n] / [(1+r)^n − 1], where P = loan amount, r = monthly rate (annual ÷ 12), n = total payments. Identical to the Mortgage Calculator — plugging the comfortable home price into that calculator will produce the same monthly payment.
  • PMI: Required when down payment is below 20%. Tiered rate: 0.50%/yr (15–19.99% down), 0.75%/yr (10–14.99%), 1.00%/yr (5–9.99%), 1.25%/yr (below 5%), applied to loan amount. PMI removal date is not modeled here — use the Mortgage Calculator for that.
  • FIRE timeline: Estimated using years_to_FI = log(25) / log(1 + savings_rate), where savings_rate = (take-home − housing − debts) / take-home. This is a directional estimate; use RetireSmart for precise modeling with your actual investment plan.
  • Privacy: No data is collected or transmitted. All calculations run entirely in your browser.

How does this home fit your FIRE plan?

This calculator shows how much house keeps you financially flexible. RetireSmart models the full picture — mortgage, savings rate, investment growth, and your retirement date.

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