.calculator-container-unique {
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
max-width: 800px;
margin: 0 auto;
padding: 20px;
background: #ffffff;
border: 1px solid #e0e0e0;
border-radius: 8px;
box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}
.calc-header {
text-align: center;
margin-bottom: 30px;
color: #2c3e50;
}
.calc-grid {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 20px;
}
@media (max-width: 600px) {
.calc-grid {
grid-template-columns: 1fr;
}
}
.input-group {
margin-bottom: 15px;
}
.input-group label {
display: block;
margin-bottom: 5px;
font-weight: 600;
color: #34495e;
font-size: 0.9rem;
}
.input-group input, .input-group select {
width: 100%;
padding: 10px;
border: 1px solid #bdc3c7;
border-radius: 4px;
font-size: 1rem;
box-sizing: border-box;
}
.input-group input:focus {
border-color: #3498db;
outline: none;
box-shadow: 0 0 5px rgba(52, 152, 219, 0.3);
}
.calc-btn {
grid-column: 1 / -1;
background-color: #2980b9;
color: white;
padding: 15px;
border: none;
border-radius: 4px;
font-size: 1.1rem;
cursor: pointer;
transition: background-color 0.3s;
width: 100%;
font-weight: bold;
}
.calc-btn:hover {
background-color: #2472a4;
}
.result-box {
grid-column: 1 / -1;
background-color: #f8f9fa;
padding: 20px;
border-radius: 6px;
margin-top: 20px;
border-left: 5px solid #27ae60;
display: none;
}
.result-row {
display: flex;
justify-content: space-between;
margin-bottom: 10px;
padding-bottom: 10px;
border-bottom: 1px solid #e9ecef;
}
.result-row:last-child {
border-bottom: none;
margin-bottom: 0;
padding-bottom: 0;
}
.result-label {
color: #7f8c8d;
}
.result-value {
font-weight: bold;
color: #2c3e50;
}
.total-payment {
font-size: 1.5rem;
color: #27ae60;
}
.seo-content {
margin-top: 40px;
line-height: 1.6;
color: #444;
}
.seo-content h2 {
color: #2c3e50;
margin-top: 30px;
border-bottom: 2px solid #ecf0f1;
padding-bottom: 10px;
}
.seo-content h3 {
color: #34495e;
margin-top: 20px;
}
.seo-content p {
margin-bottom: 15px;
}
.seo-content ul {
margin-bottom: 15px;
padding-left: 20px;
}
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 loanTermYears = parseInt(document.getElementById('loanTerm').value);
var propertyTaxAnnual = parseFloat(document.getElementById('propertyTax').value);
var insuranceAnnual = parseFloat(document.getElementById('insurance').value);
var hoaFeesMonthly = parseFloat(document.getElementById('hoaFees').value);
// Validation to ensure numbers are valid
if (isNaN(homePrice) || isNaN(downPayment) || isNaN(interestRate) || isNaN(loanTermYears)) {
alert("Please enter valid numbers for Home Price, Down Payment, and Interest Rate.");
return;
}
// Handle optional fields if empty
if (isNaN(propertyTaxAnnual)) propertyTaxAnnual = 0;
if (isNaN(insuranceAnnual)) insuranceAnnual = 0;
if (isNaN(hoaFeesMonthly)) hoaFeesMonthly = 0;
// Derived Variables
var principal = homePrice – downPayment;
if (principal <= 0) {
alert("Down payment cannot be greater than or equal to the home price.");
return;
}
// Monthly Interest Rate
var monthlyRate = (interestRate / 100) / 12;
// Total Number of Payments
var numberOfPayments = loanTermYears * 12;
// Calculate Monthly Principal & Interest (Standard Amortization Formula)
// M = P [ i(1 + i)^n ] / [ (1 + i)^n – 1 ]
var monthlyPI = 0;
if (interestRate === 0) {
monthlyPI = principal / numberOfPayments;
} else {
monthlyPI = principal * ( (monthlyRate * Math.pow(1 + monthlyRate, numberOfPayments)) / (Math.pow(1 + monthlyRate, numberOfPayments) – 1) );
}
// Calculate Monthly Tax and Insurance
var monthlyTax = propertyTaxAnnual / 12;
var monthlyInsurance = insuranceAnnual / 12;
// Total Monthly Payment
var totalMonthlyPayment = monthlyPI + monthlyTax + monthlyInsurance + hoaFeesMonthly;
// Total Interest Paid Lifetime
var totalPaymentLifetime = (monthlyPI * numberOfPayments);
var totalInterest = totalPaymentLifetime – principal;
// Update UI
document.getElementById('resPI').innerText = "$" + monthlyPI.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('resTax').innerText = "$" + monthlyTax.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('resIns').innerText = "$" + monthlyInsurance.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('resHOA').innerText = "$" + hoaFeesMonthly.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('resTotal').innerText = "$" + totalMonthlyPayment.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('resTotalInterest').innerText = "$" + totalInterest.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2});
// Show results
document.getElementById('resultsArea').style.display = 'block';
}
Monthly Mortgage Calculator
Estimate your monthly payments, interest, and payoff amount accurately.
30 Years
20 Years
15 Years
10 Years
Principal & Interest:
$0.00
Property Tax (Monthly):
$0.00
Home Insurance (Monthly):
$0.00
HOA Fees:
$0.00
Total Monthly Payment:
$0.00
Total Interest Paid (Lifetime):
$0.00
Understanding Your Mortgage Calculation
Purchasing a home is one of the most significant financial decisions you will make. This Mortgage Calculator helps you break down the monthly costs associated with a home loan, ensuring you understand exactly where your money goes. Unlike simple calculators that only look at principal and interest, our tool includes property taxes, homeowner's insurance, and HOA fees to give you a realistic "out-the-door" monthly figure.
How the Mortgage Formula Works
The core of a mortgage payment is determined by the amortization formula. This calculates the fixed monthly payment required to pay off the loan balance in full over the specific term (usually 15 or 30 years). The formula considers:
- Principal: The actual amount borrowed (Home Price minus Down Payment).
- Interest Rate: The cost of borrowing money, expressed as an annual percentage.
- Loan Term: The duration of the loan. A longer term (30 years) lowers monthly payments but increases total interest paid compared to a shorter term (15 years).
What is PITI?
Lenders often refer to your monthly payment as PITI, which stands for:
- Principal: The portion of payment reducing the loan balance.
- Interest: The profit the lender makes on the loan.
- Taxes: Property taxes charged by your local government, usually held in escrow by the lender.
- Insurance: Homeowner's insurance to protect the property against damage.
Why Include HOA Fees?
If you are buying a condo or a home in a planned community, you likely have to pay Homeowner Association (HOA) fees. While these are not paid to the lender, they are a mandatory monthly cost that affects your Debt-to-Income (DTI) ratio and overall affordability. This calculator adds them to your total monthly estimated cost to prevent financial surprises.
Tips for Lowering Your Mortgage Payment
If the calculated payment is higher than your budget allows, consider the following strategies:
- Increase your down payment: This lowers the principal loan amount and reduces the monthly obligation.
- Improve your credit score: A higher score often qualifies you for a lower interest rate.
- Shop for insurance: Homeowner's insurance premiums vary significantly; getting multiple quotes can save money.
- Consider a longer term: Switching from a 15-year to a 30-year term reduces monthly payments, though it increases total interest costs.