This calculator helps you estimate how much house you can afford based on your income, debts, and down payment. It's a crucial step in the home-buying process to understand your budget realistically.
Your Estimated Maximum Mortgage Affordability:
$0.00
Note: This is an estimate. Lenders will consider your credit score, debt-to-income ratio, and other factors.
function calculateMortgageAffordability() {
var annualIncome = parseFloat(document.getElementById("annualIncome").value);
var monthlyDebt = parseFloat(document.getElementById("monthlyDebt").value);
var downPayment = parseFloat(document.getElementById("downPayment").value);
var interestRate = parseFloat(document.getElementById("interestRate").value);
var loanTerm = parseFloat(document.getElementById("loanTerm").value);
var resultElement = document.getElementById("maxMortgageAmount");
if (isNaN(annualIncome) || isNaN(monthlyDebt) || isNaN(downPayment) || isNaN(interestRate) || isNaN(loanTerm) ||
annualIncome < 0 || monthlyDebt < 0 || downPayment < 0 || interestRate < 0 || loanTerm <= 0) {
resultElement.innerText = "Please enter valid positive numbers for all fields.";
return;
}
// General guidelines for lenders suggest a Debt-to-Income ratio (DTI) of around 28%-36% for housing expenses.
// We'll use a conservative 28% for the maximum housing payment.
var maxHousingPayment = (annualIncome / 12) * 0.28;
// Subtract existing monthly debts to find the maximum PITI (Principal, Interest, Taxes, Insurance) payment.
var maxPitiPayment = maxHousingPayment – monthlyDebt;
if (maxPitiPayment 0) {
maxMortgageAmount = maxPitiPayment * (1 – Math.pow(1 + monthlyInterestRate, -numberOfPayments)) / monthlyInterestRate;
} else { // Handle the case of 0% interest rate
maxMortgageAmount = maxPitiPayment * numberOfPayments;
}
// The calculated maxMortgageAmount is the maximum loan you can afford.
// To find the maximum home price, we add the down payment.
var maxHomePrice = maxMortgageAmount + downPayment;
resultElement.innerText = "$" + maxHomePrice.toFixed(2);
}
.calculator-container {
font-family: sans-serif;
border: 1px solid #ccc;
padding: 20px;
border-radius: 8px;
max-width: 600px;
margin: 20px auto;
background-color: #f9f9f9;
}
.calculator-container h2 {
text-align: center;
margin-bottom: 15px;
color: #333;
}
.calculator-container p {
text-align: center;
margin-bottom: 25px;
color: #555;
font-size: 0.95em;
}
.calculator-inputs {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
gap: 15px;
margin-bottom: 20px;
}
.input-group {
display: flex;
flex-direction: column;
}
.input-group label {
margin-bottom: 5px;
font-weight: bold;
color: #444;
}
.input-group input {
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
font-size: 1em;
}
button {
display: block;
width: 100%;
padding: 12px 20px;
background-color: #007bff;
color: white;
border: none;
border-radius: 4px;
font-size: 1.1em;
cursor: pointer;
transition: background-color 0.3s ease;
margin-bottom: 20px;
}
button:hover {
background-color: #0056b3;
}
.calculator-result {
background-color: #e7f3fe;
border: 1px solid #b3d7ff;
padding: 15px;
border-radius: 4px;
text-align: center;
}
.calculator-result h3 {
margin-top: 0;
color: #0056b3;
}
#maxMortgageAmount {
font-size: 1.5em;
font-weight: bold;
color: #333;
margin-bottom: 10px;
}