House Affordability Calculator
Analyze your safe housing budget and DTI metrics based on your financial profile.
Financial Profiles
Advanced Estimates (Escrow, PMI)
Custom Interest Rates
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Debt-to-Income (DTI) Stress Gauge
Based on the traditional financial 28/36 lending rule.
Interactive Visualization
Rate Shock Simulator
Stress-test your finances against future interest rate hikes.
Amortization Schedule
Detailed payment-by-payment breakdown over the loan duration.
| Pmt # | Principal | Interest | Tax/Ins/PMI | Extra | Ending Balance |
|---|
House Affordability Handbook
Evaluating purchasing thresholds using the 28/36 rule
What this engine does
Analyzes your gross income, ongoing recurring obligations, down payment capital, and local escrow costs to back-calculate your safe and maximum purchasing power.
When to deploy this tool
Use this calculator at the very start of your home shopping journey, before seeking mortgage pre-approvals, to establish real budget guardrails.
How Calculations Work
Calculates two target housing payments: Comfortable (28% of gross monthly income) and Stretch (36% of gross monthly income minus monthly debts). It then runs piecewise back-calculations solving for Home Price H where: Monthly P&I + Taxes + Insurance + PMI + HOA equals the target payment.
Common Strategic Pitfalls
Avoid assuming you can borrow up to FHA max DTI ratios (43% to 50%) without severe budget strain. Lenders define what you can borrow, not what you should spend. Always factor in local property tax assessments and condo/HOA dues.
Sources & Assumptions
Calculations are based on industry-standard financial models. To review the mathematical formulas and verification reports in detail, visit our dedicated Financial Methodology page.
Pre-populated data reflects estimated national averages sourced from county tax agencies and regional insurance reports. Homeowners can customize these percentages inside advanced settings cards.
PMI is modeled at 0.75% of the initial loan principal annually for LTV ratios exceeding 80%, automatically terminating in calculations when the outstanding loan balance drops to or below 80% of the initial purchase price.
Frequently Asked Questions
Can I buy a house with a higher DTI than 36%?
Yes, some programs like FHA loans allow total debt ratios up to 43% or even 50% with compensating factors. However, spending half your gross income on housing and debt severely restricts your ability to save or cover emergencies.
Should I include utility bills in my monthly debts?
No, utilities, phone bills, car insurance, and groceries are not reporting debts. Only include recurring obligations that appear on your credit report, such as student loans, credit card minimums, and car payments.
How much cash reserves should I maintain after closing?
Beyond your down payment and closing costs (which average 2% to 5% of purchase price), it is highly recommended to retain at least 3 to 6 months of total housing expenses in an emergency fund.
Financial Disclaimer
This calculator is intended for planning and educational purposes only. It relies on assumptions and information provided by you regarding your goals, expectations, and financial situation. Results should not be used as your sole source of information. Outputs are estimates only and do not constitute a loan offer, financial advice, legal advice, tax advice, or solicitation. Consult qualified professionals before making financial decisions.