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Home Affordability Calculator

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Estimated Home Price:
Max Monthly Mortgage (P&I):
Estimated Loan Amount:

How Much House Can I Afford?

Determining your home buying budget is the most critical step in the real estate journey. While banks use complex algorithms, our home affordability calculator uses the industry-standard Debt-to-Income (DTI) ratio to estimate your purchasing power. Generally, lenders prefer that your total monthly debts (including your new mortgage) do not exceed 36% to 43% of your gross monthly income.

Understanding the 28/36 Rule

Most financial experts recommend the 28/36 rule:

  • 28%: Your mortgage payment should not exceed 28% of your monthly gross income.
  • 36%: Your total debt payments (mortgage + car loans + student loans + credit cards) should not exceed 36% of your monthly gross income.

Example Calculation

If you earn $80,000 per year, your gross monthly income is $6,666. Using the 36% rule, your total monthly debt limit is $2,400. If you already have $500 in monthly car and student loan payments, you have $1,900 remaining for your monthly mortgage payment (Principal, Interest, Taxes, and Insurance).

Factors That Impact Your Affordability

1. Interest Rates: Even a 1% difference in interest rates can change your purchasing power by tens of thousands of dollars.

2. Down Payment: A larger down payment reduces your loan amount, which lowers your monthly interest costs and may eliminate the need for Private Mortgage Insurance (PMI).

3. Credit Score: Higher credit scores qualify you for lower interest rates, effectively increasing the "price" of the home you can afford for the same monthly payment.

4. Property Taxes & Insurance: Our calculator focuses on the Principal and Interest (P&I). Remember to set aside roughly 1-2% of the home value annually for taxes and insurance.

function calculateAffordability() { var annualIncome = parseFloat(document.getElementById('annualIncome').value); var monthlyDebt = parseFloat(document.getElementById('monthlyDebt').value); var downPayment = parseFloat(document.getElementById('downPayment').value); var annualRate = parseFloat(document.getElementById('interestRate').value); var loanYears = parseFloat(document.getElementById('loanTerm').value); if (isNaN(annualIncome) || isNaN(monthlyDebt) || isNaN(downPayment) || isNaN(annualRate)) { alert("Please enter valid numerical values."); return; } // Standard 36% DTI Rule var grossMonthlyIncome = annualIncome / 12; var maxTotalMonthlyDebt = grossMonthlyIncome * 0.36; var maxMonthlyPI = maxTotalMonthlyDebt – monthlyDebt; if (maxMonthlyPI <= 0) { document.getElementById('results-area').style.display = 'block'; document.getElementById('resHomePrice').innerHTML = "Ineligible"; document.getElementById('resMonthlyPI').innerHTML = "$0"; document.getElementById('resLoanAmount').innerHTML = "Current debt levels are too high for this income level."; return; } var monthlyRate = (annualRate / 100) / 12; var totalMonths = loanYears * 12; // Loan Amount Formula: P = M * [ (1+i)^n – 1 ] / [ i(1+i)^n ] var loanAmount = maxMonthlyPI * (Math.pow(1 + monthlyRate, totalMonths) – 1) / (monthlyRate * Math.pow(1 + monthlyRate, totalMonths)); var homePrice = loanAmount + downPayment; // Formatting var formatter = new Intl.NumberFormat('en-US', { style: 'currency', currency: 'USD', maximumFractionDigits: 0 }); document.getElementById('results-area').style.display = 'block'; document.getElementById('resHomePrice').innerHTML = formatter.format(homePrice); document.getElementById('resMonthlyPI').innerHTML = formatter.format(maxMonthlyPI); document.getElementById('resLoanAmount').innerHTML = formatter.format(loanAmount); // Smooth scroll to results document.getElementById('results-area').scrollIntoView({ behavior: 'smooth', block: 'nearest' }); } #affordability-calculator-container input:focus, #affordability-calculator-container select:focus { outline: none; border-color: #2b6cb0; box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.2); } .input-group label { transition: color 0.2s; } @media (max-width: 600px) { #affordability-calculator-container div[style*="grid-template-columns: 1fr 1fr"] { grid-template-columns: 1fr !important; } }

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