#mortgage-calculator-container {
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
max-width: 800px;
margin: 0 auto;
padding: 20px;
background: #f9f9f9;
border: 1px solid #e0e0e0;
border-radius: 8px;
color: #333;
}
#mortgage-calculator-container h2 {
text-align: center;
color: #2c3e50;
margin-bottom: 25px;
}
.calc-wrapper {
display: flex;
flex-wrap: wrap;
gap: 20px;
}
.calc-inputs {
flex: 1;
min-width: 300px;
}
.calc-results {
flex: 1;
min-width: 300px;
background: #fff;
padding: 20px;
border-radius: 8px;
box-shadow: 0 2px 5px rgba(0,0,0,0.05);
display: flex;
flex-direction: column;
justify-content: center;
}
.input-group {
margin-bottom: 15px;
}
.input-group label {
display: block;
margin-bottom: 5px;
font-weight: 600;
font-size: 0.95em;
}
.input-group input, .input-group select {
width: 100%;
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
font-size: 16px;
}
.btn-calc {
width: 100%;
padding: 12px;
background-color: #27ae60;
color: white;
border: none;
border-radius: 4px;
font-size: 18px;
cursor: pointer;
font-weight: bold;
transition: background 0.3s;
}
.btn-calc:hover {
background-color: #219150;
}
.result-row {
display: flex;
justify-content: space-between;
margin-bottom: 15px;
padding-bottom: 10px;
border-bottom: 1px solid #eee;
}
.result-row.total {
border-bottom: none;
margin-top: 10px;
font-size: 1.2em;
font-weight: bold;
color: #27ae60;
}
.result-label {
color: #7f8c8d;
}
.result-value {
font-weight: bold;
color: #2c3e50;
}
.seo-content {
margin-top: 40px;
padding-top: 20px;
border-top: 2px solid #eee;
line-height: 1.6;
}
.seo-content h3 {
color: #2980b9;
margin-top: 20px;
}
.seo-content p {
margin-bottom: 15px;
}
.error-msg {
color: #c0392b;
font-size: 0.9em;
display: none;
margin-bottom: 10px;
}
@media (max-width: 600px) {
.calc-wrapper {
flex-direction: column;
}
}
function calculateMortgage() {
// Get inputs
var homePrice = parseFloat(document.getElementById('homePrice').value);
var downPayment = parseFloat(document.getElementById('downPayment').value);
var interestRate = parseFloat(document.getElementById('interestRate').value);
var loanTerm = parseFloat(document.getElementById('loanTerm').value);
var propertyTaxAnnual = parseFloat(document.getElementById('propertyTax').value);
var homeInsuranceAnnual = parseFloat(document.getElementById('homeInsurance').value);
var hoaFeesMonthly = parseFloat(document.getElementById('hoaFees').value);
// Validation
if (isNaN(homePrice) || isNaN(downPayment) || isNaN(interestRate) || isNaN(loanTerm) ||
homePrice < 0 || downPayment < 0 || interestRate < 0) {
document.getElementById('error-message').style.display = 'block';
return;
} else {
document.getElementById('error-message').style.display = 'none';
}
// Calculations
var loanAmount = homePrice – downPayment;
// Handle edge case where loan amount is 0 or negative
if (loanAmount 0 && interestRate > 0) {
monthlyPrincipalInterest = loanAmount *
(monthlyRate * Math.pow(1 + monthlyRate, numberOfPayments)) /
(Math.pow(1 + monthlyRate, numberOfPayments) – 1);
} else if (loanAmount > 0 && interestRate === 0) {
monthlyPrincipalInterest = loanAmount / numberOfPayments;
}
var monthlyTax = propertyTaxAnnual / 12;
var monthlyInsurance = homeInsuranceAnnual / 12;
var totalMonthlyPayment = monthlyPrincipalInterest + monthlyTax + monthlyInsurance + hoaFeesMonthly;
// Total Interest and Cost
var totalPaymentOverTerm = (monthlyPrincipalInterest * numberOfPayments);
var totalInterest = totalPaymentOverTerm – loanAmount;
var totalCostOfLoan = totalPaymentOverTerm + downPayment;
// Formatter
var formatter = new Intl.NumberFormat('en-US', {
style: 'currency',
currency: 'USD',
minimumFractionDigits: 2
});
// Update DOM
document.getElementById('res-pi').innerText = formatter.format(monthlyPrincipalInterest);
document.getElementById('res-tax').innerText = formatter.format(monthlyTax);
document.getElementById('res-ins').innerText = formatter.format(monthlyInsurance);
document.getElementById('res-hoa').innerText = formatter.format(hoaFeesMonthly);
document.getElementById('res-total').innerText = formatter.format(totalMonthlyPayment);
document.getElementById('res-loan-amount').innerText = formatter.format(loanAmount);
document.getElementById('res-total-interest').innerText = formatter.format(totalInterest);
document.getElementById('res-total-cost').innerText = formatter.format(totalCostOfLoan);
}
// Initialize on load with default values
window.onload = function() {
calculateMortgage();
};
Mortgage Payment Calculator
30 Years
20 Years
15 Years
10 Years
Please enter valid positive numbers.
Monthly Breakdown
Principal & Interest
$0.00
Property Tax
$0.00
Home Insurance
$0.00
HOA Fees
$0.00
Total Monthly Pay
$0.00
Loan Amount
$0.00
Total Interest Paid
$0.00
Total Cost of Loan
$0.00
How to Use This Mortgage Calculator
Purchasing a home is one of the most significant financial decisions you will make. This Mortgage Calculator is designed to give you a precise estimate of your monthly housing costs, breaking down not just the loan repayment but also the hidden costs like taxes and insurance.
Understanding Your Monthly Payment
Your monthly mortgage payment typically consists of four main components, often referred to as PITI:
- Principal: The portion of your payment that reduces the loan balance.
- Interest: The cost of borrowing money from your lender.
- Taxes: Property taxes charged by your local government, usually collected in escrow.
- Insurance: Homeowners insurance to protect against damage, also often in escrow.
Factors Affecting Your Mortgage
Down Payment: A larger down payment reduces your loan amount, which lowers your monthly principal and interest payments. Avoiding Private Mortgage Insurance (PMI) typically requires a 20% down payment.
Interest Rate: Even a small difference in interest rates can significantly impact your total cost over 30 years. Your rate is determined by your credit score, the economy, and the loan type.
Loan Term: A 30-year term offers lower monthly payments but results in higher total interest paid compared to a 15-year term.
Why Calculate Early?
Using a mortgage calculator before you start house hunting helps you set a realistic budget. It prevents the heartache of falling in love with a property that exceeds your financial comfort zone. Remember to factor in maintenance costs and emergency funds on top of these calculated figures.