Home Affordability Calculator
Find out exactly how much house you can afford. Enter your income, debts, and preferences — results update instantly.
What Is a Home Affordability Calculator?
A home affordability calculator works backward from your financial profile to determine the maximum safe home price. Unlike a basic mortgage calculator that estimates payments for a known price, this tool starts with your income and debts to find your ceiling.
Our calculator uses state-specific property tax rates, homeowner’s insurance, HOA fees, and your exact Debt-to-Income ratio to produce a realistic budget — not just a rough estimate. Every change you make to the inputs updates results in real time.
How We Calculate Maximum Home Price
The math behind the results is based on the standard PITI (Principal, Interest, Taxes, Insurance) model used by mortgage lenders.
- Step 1 — Max housing budget: Monthly income × DTI% − existing monthly debts = available for PITI.
- Step 2 — Remove fixed costs: Subtract monthly insurance and HOA from the available PITI budget.
- Step 3 — Solve for home price: Using the mortgage amortization formula and the property tax rate, we solve algebraically for the home price that generates exactly that P&I + tax payment.
- Step 4 — Apply credit adjustment: Your credit score shifts the base interest rate up or down, changing the resulting home price.
Formula: H = (MaxPITI − Ins − HOA + DP × M) ÷ (M + TaxRate/12), where M is the monthly mortgage factor r(1+r)ⁿ/[(1+r)ⁿ−1].
How Credit Scores Affect Your Buying Power
| Credit Score | Rating | Rate Adjustment | Buying Power |
|---|---|---|---|
| 760 – 850 | Excellent | Baseline (no add) | Maximum |
| 700 – 759 | Good | +0.25% | High |
| 680 – 699 | Fair | +0.50% | Moderate |
| 620 – 679 | Poor | +1.00% | Reduced |
| < 620 | High Risk | +1.50% | Very Limited |
*A 1% rate increase reduces buying power by approximately 10% for the same monthly budget.
Salary-to-Home Price Reference
Quick reference assuming 20% down, 6.5% rate, no consumer debt, 36% DTI:
| Annual Salary | Max Monthly PITI | Est. Home Price |
|---|---|---|
| $60,000 | $1,800 | ~$235,000 |
| $80,000 | $2,400 | ~$315,000 |
| $100,000 | $3,000 | ~$395,000 |
| $150,000 | $4,500 | ~$590,000 |
| $200,000 | $6,000 | ~$790,000 |
Frequently Asked Questions
Most financial advisors recommend keeping your housing payment under 28% of gross monthly income (front-end DTI) and total debt under 36% (back-end DTI). The 28/36 rule is a well-established benchmark. Our calculator defaults to 36% but lets you adjust from 20% to 50%.
Your maximum monthly payment is fixed by your income. When rates rise, more of that payment goes to interest rather than principal — so the loan balance you can carry shrinks, which directly reduces the maximum home price you can afford.
Our calculator includes homeowner’s insurance but not PMI (Private Mortgage Insurance), which applies when your down payment is under 20% and varies by lender and credit score. If applicable, add your estimated monthly PMI to the Annual Insurance field (multiply monthly PMI × 12).
Principal + Interest + Taxes + Insurance. PITI is the true total monthly cost of homeownership used by lenders to evaluate loan applications. It’s what our calculator uses as your housing budget.