.mortgage-calc-container {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
max-width: 800px;
margin: 0 auto;
background: #fff;
padding: 20px;
border: 1px solid #e0e0e0;
border-radius: 8px;
box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}
.mc-header {
text-align: center;
margin-bottom: 30px;
}
.mc-header h2 {
color: #2c3e50;
margin: 0;
font-size: 28px;
}
.mc-row {
display: flex;
flex-wrap: wrap;
margin: 0 -10px;
}
.mc-col {
flex: 1;
min-width: 300px;
padding: 0 10px;
margin-bottom: 20px;
}
.mc-input-group {
margin-bottom: 15px;
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.mc-input-group label {
display: block;
margin-bottom: 5px;
font-weight: 600;
color: #555;
font-size: 14px;
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.mc-input-wrapper {
position: relative;
display: flex;
align-items: center;
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.mc-input-prefix, .mc-input-suffix {
background: #f1f3f4;
padding: 10px 12px;
border: 1px solid #ccc;
color: #555;
font-size: 14px;
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.mc-input-prefix {
border-right: none;
border-radius: 4px 0 0 4px;
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.mc-input-suffix {
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.mc-input-wrapper input {
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padding: 10px;
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width: 100%;
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.mc-input-wrapper input:focus {
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/* Fix for rounded corners when no prefix/suffix */
.mc-input-wrapper input:first-child { border-radius: 4px 0 0 4px; }
.mc-input-wrapper input:last-child { border-radius: 0 4px 4px 0; }
.mc-input-wrapper input:only-child { border-radius: 4px; }
.mc-input-wrapper .mc-input-prefix + input { border-radius: 0; }
.mc-input-wrapper input + .mc-input-suffix { border-radius: 0 4px 4px 0; }
.mc-btn {
width: 100%;
background-color: #27ae60;
color: white;
border: none;
padding: 15px;
font-size: 18px;
font-weight: bold;
border-radius: 4px;
cursor: pointer;
transition: background 0.3s;
margin-top: 10px;
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.mc-btn:hover {
background-color: #219150;
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.mc-result-box {
background: #f8f9fa;
border: 1px solid #e9ecef;
border-radius: 6px;
padding: 20px;
text-align: center;
margin-top: 20px;
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.mc-total-payment {
font-size: 36px;
font-weight: 800;
color: #2c3e50;
margin: 10px 0;
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.mc-result-label {
text-transform: uppercase;
letter-spacing: 1px;
font-size: 12px;
color: #7f8c8d;
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.mc-breakdown-row {
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margin-bottom: 8px;
color: #555;
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.mc-breakdown-row.total {
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padding-top: 8px;
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.mc-content {
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.mc-content h3 {
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.mc-content p {
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.mc-content ul {
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.mc-content li {
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.error-msg {
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font-size: 14px;
text-align: center;
margin-top: 10px;
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@media (max-width: 600px) {
.mc-row { flex-direction: column; }
.mc-col { min-width: 100%; }
}
function calculateMortgage() {
// Get Input Values
var homePrice = parseFloat(document.getElementById('mcHomePrice').value);
var downPayment = parseFloat(document.getElementById('mcDownPayment').value);
var interestRate = parseFloat(document.getElementById('mcInterestRate').value);
var loanTerm = parseFloat(document.getElementById('mcLoanTerm').value);
var annualTax = parseFloat(document.getElementById('mcPropertyTax').value);
var annualInsurance = parseFloat(document.getElementById('mcInsurance').value);
var monthlyHOA = parseFloat(document.getElementById('mcHOA').value);
// Validation
var errorMsg = document.getElementById('mcError');
if (isNaN(homePrice) || isNaN(downPayment) || isNaN(interestRate) || isNaN(loanTerm) ||
isNaN(annualTax) || isNaN(annualInsurance) || isNaN(monthlyHOA) ||
homePrice < 0 || loanTerm <= 0) {
errorMsg.style.display = 'block';
document.getElementById('mcResult').style.display = 'none';
return;
}
errorMsg.style.display = 'none';
// Calculations
var principal = homePrice – downPayment;
var monthlyRate = (interestRate / 100) / 12;
var numberOfPayments = loanTerm * 12;
var monthlyPI = 0;
// Handle 0% interest edge case
if (interestRate === 0) {
monthlyPI = principal / numberOfPayments;
} else {
// Formula: M = P [ i(1 + i)^n ] / [ (1 + i)^n – 1]
monthlyPI = principal * ( (monthlyRate * Math.pow(1 + monthlyRate, numberOfPayments)) / (Math.pow(1 + monthlyRate, numberOfPayments) – 1) );
}
var monthlyTax = annualTax / 12;
var monthlyInsurance = annualInsurance / 12;
var totalMonthly = monthlyPI + monthlyTax + monthlyInsurance + monthlyHOA;
// Formatting Function
function formatMoney(num) {
return '$' + num.toFixed(2).replace(/\d(?=(\d{3})+\.)/g, '$&,');
}
// Update DOM
document.getElementById('mcTotalDisplay').innerHTML = formatMoney(totalMonthly);
document.getElementById('mcPIDisplay').innerHTML = formatMoney(monthlyPI);
document.getElementById('mcTaxDisplay').innerHTML = formatMoney(monthlyTax);
document.getElementById('mcInsDisplay').innerHTML = formatMoney(monthlyInsurance);
document.getElementById('mcHOADisplay').innerHTML = formatMoney(monthlyHOA);
// Show Result
document.getElementById('mcResult').style.display = 'block';
}
// Initial Calculation on load
window.onload = function() {
calculateMortgage();
};
Mortgage Payment Calculator
Estimate your monthly payments including tax and insurance.
$
$
%
Years
$
Approx. 1.2% of home value
$
$
Please enter valid positive numbers for all fields.
Estimated Monthly Payment
$0.00
Principal & Interest:
$0.00
Property Tax:
$0.00
Home Insurance:
$0.00
HOA Fees:
$0.00
Understanding How Your Mortgage Payment is Calculated
When planning to purchase a home, understanding the components of your monthly mortgage payment is crucial for accurate budgeting. This calculator provides a comprehensive breakdown of costs beyond just the loan repayment.
The PITI Principle
Most mortgage payments are comprised of four main parts, commonly referred to as PITI:
- Principal: The portion of your payment that goes toward paying down the loan balance (the amount you borrowed).
- Interest: The fee charged by the lender for the privilege of borrowing the money. In the early years of a mortgage, a higher percentage of your payment goes toward interest.
- Taxes: Property taxes assessed by your local government. Lenders typically collect this monthly and hold it in an escrow account to pay the bill annually on your behalf.
- Insurance: Homeowners insurance protects your property against hazards. Like taxes, this is often collected monthly into an escrow account.
Additional Factors Affecting Affordability
HOA Fees: If you are buying a condo or a home in a planned community, you may have to pay Homeowners Association (HOA) fees. While these are usually paid directly to the association, they affect your debt-to-income ratio and overall monthly budget.
Down Payment Impact: A larger down payment reduces your Principal amount, which lowers your monthly payments and the total interest paid over the life of the loan. Typically, if you put down less than 20%, you may also be required to pay Private Mortgage Insurance (PMI), which would increase your monthly costs further.
How to Use This Calculator
Enter the Home Price and your planned Down Payment to determine the loan amount. Adjust the Interest Rate based on current market trends and your credit score. Don't forget to include estimates for Property Taxes and Insurance to see the true monthly cost of homeownership.