.calc-wrapper {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
max-width: 800px;
margin: 0 auto;
padding: 20px;
background: #f9f9f9;
border: 1px solid #e0e0e0;
border-radius: 8px;
}
.calc-header {
text-align: center;
margin-bottom: 30px;
}
.calc-header h2 {
margin: 0;
color: #2c3e50;
font-size: 28px;
}
.calc-container {
display: flex;
flex-wrap: wrap;
gap: 20px;
}
.calc-col {
flex: 1;
min-width: 300px;
}
.input-group {
margin-bottom: 15px;
}
.input-group label {
display: block;
margin-bottom: 5px;
font-weight: 600;
color: #34495e;
font-size: 14px;
}
.input-group input {
width: 100%;
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
font-size: 16px;
box-sizing: border-box;
}
.input-group input:focus {
border-color: #3498db;
outline: none;
}
.calc-btn {
width: 100%;
padding: 12px;
background-color: #2ecc71;
color: white;
border: none;
border-radius: 4px;
font-size: 18px;
font-weight: bold;
cursor: pointer;
transition: background 0.3s;
margin-top: 10px;
}
.calc-btn:hover {
background-color: #27ae60;
}
.results-box {
background: #ffffff;
padding: 20px;
border-radius: 8px;
box-shadow: 0 2px 10px rgba(0,0,0,0.05);
margin-top: 20px;
border-left: 5px solid #3498db;
}
.main-result {
text-align: center;
margin-bottom: 20px;
padding-bottom: 15px;
border-bottom: 1px solid #eee;
}
.main-result .label {
font-size: 14px;
color: #7f8c8d;
text-transform: uppercase;
letter-spacing: 1px;
}
.main-result .value {
font-size: 42px;
color: #2c3e50;
font-weight: bold;
}
.breakdown-row {
display: flex;
justify-content: space-between;
margin-bottom: 8px;
font-size: 15px;
color: #555;
}
.breakdown-row strong {
color: #2c3e50;
}
.seo-content {
margin-top: 40px;
line-height: 1.6;
color: #333;
}
.seo-content h3 {
color: #2c3e50;
margin-top: 25px;
font-size: 22px;
}
.seo-content p {
margin-bottom: 15px;
}
.seo-content ul {
margin-bottom: 15px;
padding-left: 20px;
}
.seo-content li {
margin-bottom: 8px;
}
@media (max-width: 600px) {
.calc-container {
flex-direction: column;
}
}
function calculateMortgage() {
// Get Input Values
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 propertyTax = parseFloat(document.getElementById("propertyTax").value);
var homeInsurance = parseFloat(document.getElementById("homeInsurance").value);
var hoaFees = parseFloat(document.getElementById("hoaFees").value);
// Validation
if (isNaN(homePrice) || isNaN(downPayment) || isNaN(interestRate) || isNaN(loanTerm)) {
alert("Please enter valid numbers for Home Price, Down Payment, Interest Rate, and Loan Term.");
return;
}
// Set defaults for optional fields if empty/NaN
if (isNaN(propertyTax)) propertyTax = 0;
if (isNaN(homeInsurance)) homeInsurance = 0;
if (isNaN(hoaFees)) hoaFees = 0;
// Core Calculations
var principal = homePrice – downPayment;
var monthlyInterestRate = interestRate / 100 / 12;
var numberOfPayments = loanTerm * 12;
// Prevent negative principal
if (principal < 0) {
alert("Down payment cannot be greater than home price.");
return;
}
// Calculate Monthly P&I
var monthlyPrincipalAndInterest = 0;
if (interestRate === 0) {
monthlyPrincipalAndInterest = principal / numberOfPayments;
} else {
monthlyPrincipalAndInterest = principal *
(monthlyInterestRate * Math.pow(1 + monthlyInterestRate, numberOfPayments)) /
(Math.pow(1 + monthlyInterestRate, numberOfPayments) – 1);
}
// Calculate Other Monthly Costs
var monthlyTax = propertyTax / 12;
var monthlyInsurance = homeInsurance / 12;
var totalMonthlyPayment = monthlyPrincipalAndInterest + monthlyTax + monthlyInsurance + hoaFees;
// Calculate Totals
var totalRepayment = (monthlyPrincipalAndInterest * numberOfPayments);
var totalInterest = totalRepayment – principal;
// Display Results
document.getElementById("resultsSection").style.display = "block";
document.getElementById("totalMonthlyPayment").innerHTML = formatCurrency(totalMonthlyPayment);
document.getElementById("piBreakdown").innerHTML = formatCurrency(monthlyPrincipalAndInterest);
document.getElementById("taxBreakdown").innerHTML = formatCurrency(monthlyTax);
document.getElementById("insBreakdown").innerHTML = formatCurrency(monthlyInsurance);
document.getElementById("hoaBreakdown").innerHTML = formatCurrency(hoaFees);
document.getElementById("loanAmountResult").innerHTML = formatCurrency(principal);
document.getElementById("totalInterestResult").innerHTML = formatCurrency(totalInterest);
document.getElementById("totalCostResult").innerHTML = formatCurrency(totalRepayment + (monthlyTax * numberOfPayments) + (monthlyInsurance * numberOfPayments) + (hoaFees * numberOfPayments));
}
function formatCurrency(num) {
return "$" + num.toFixed(2).replace(/\d(?=(\d{3})+\.)/g, '$&,');
}
Mortgage Calculator
Estimated Monthly Payment
$0.00
Principal & Interest:
$0.00
Property Tax:
$0.00
Home Insurance:
$0.00
HOA Fees:
$0.00
Total Loan Amount:
$0.00
Total Interest Paid:
$0.00
Total Cost of Loan:
$0.00
Understanding Your Mortgage Payment
When planning to purchase a home, understanding the components of your monthly mortgage payment is crucial for maintaining a healthy budget. This calculator provides a comprehensive breakdown of what you can expect to pay each month, going beyond just the principal and interest to include critical factors like taxes and insurance.
Key Components of a Mortgage
- Principal: The portion of your payment that goes toward paying down the original amount you borrowed.
- Interest: The fee charged by the lender for borrowing the money. In the early years of a fixed-rate mortgage, a larger portion of your payment goes toward interest.
- Escrow (Taxes & Insurance): Most lenders require you to pay a portion of your annual property taxes and homeowners insurance each month. These funds are held in an escrow account and paid on your behalf when due.
- HOA Fees: If you are buying a condo or a home in a planned community, you may have monthly Homeowners Association fees. While usually paid directly to the association, they affect your total monthly housing cost.
How Interest Rates Affect Your Payment
Even a small difference in interest rates can have a significant impact on your monthly payment and the total cost of the loan over time. For example, on a $300,000 loan, a 1% increase in interest rate can increase your monthly payment by hundreds of dollars and your total interest paid by tens of thousands over a 30-year term. Use the input field above to test different scenarios and see how refinancing or shopping for a better rate could save you money.
Fixed vs. Adjustable Rate Mortgages
The calculations above assume a fixed-rate mortgage, where the interest rate remains constant for the life of the loan. Adjustable-rate mortgages (ARMs) may start with a lower rate that changes after a set period (e.g., 5 or 7 years), potentially increasing your monthly payment in the future.