#mortgage-calculator-wrapper h2 {
color: #2c3e50;
border-bottom: 2px solid #3498db;
padding-bottom: 10px;
margin-bottom: 25px;
}
.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: #555;
font-size: 0.95em;
}
.input-group input, .input-group select {
width: 100%;
padding: 10px;
border: 1px solid #ddd;
border-radius: 4px;
font-size: 16px;
box-sizing: border-box;
}
.input-group input:focus {
border-color: #3498db;
outline: none;
}
.calc-btn {
background-color: #3498db;
color: white;
border: none;
padding: 12px 20px;
font-size: 16px;
font-weight: bold;
border-radius: 4px;
cursor: pointer;
width: 100%;
transition: background 0.3s;
margin-top: 10px;
}
.calc-btn:hover {
background-color: #2980b9;
}
.results-section {
background-color: #f8f9fa;
padding: 20px;
border-radius: 6px;
margin-top: 25px;
border: 1px solid #e9ecef;
}
.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: #666;
}
.result-value {
font-weight: bold;
color: #2c3e50;
}
.total-payment {
font-size: 1.5em;
color: #27ae60;
}
.calc-article {
margin-top: 40px;
line-height: 1.6;
color: #333;
}
.calc-article h3 {
color: #2c3e50;
margin-top: 25px;
}
.calc-article p {
margin-bottom: 15px;
}
.calc-article 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 loanTermYears = parseFloat(document.getElementById('loanTerm').value);
var interestRateAnnual = parseFloat(document.getElementById('interestRate').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(interestRateAnnual) || isNaN(loanTermYears)) {
alert("Please enter valid numbers for Home Price, Down Payment, Interest Rate, and Term.");
return;
}
// Default optional fields to 0 if empty/NaN
if (isNaN(propertyTaxAnnual)) propertyTaxAnnual = 0;
if (isNaN(homeInsuranceAnnual)) homeInsuranceAnnual = 0;
if (isNaN(hoaFeesMonthly)) hoaFeesMonthly = 0;
// Mortgage Logic
var principal = homePrice – downPayment;
var monthlyInterestRate = interestRateAnnual / 100 / 12;
var numberOfPayments = loanTermYears * 12;
// P&I Calculation formula: M = P [ i(1 + i)^n ] / [ (1 + i)^n – 1 ]
var monthlyPrincipalInterest = 0;
if (interestRateAnnual === 0) {
monthlyPrincipalInterest = principal / numberOfPayments;
} else {
monthlyPrincipalInterest = principal * (
(monthlyInterestRate * Math.pow(1 + monthlyInterestRate, numberOfPayments)) /
(Math.pow(1 + monthlyInterestRate, numberOfPayments) – 1)
);
}
// Monthly Components
var monthlyTax = propertyTaxAnnual / 12;
var monthlyInsurance = homeInsuranceAnnual / 12;
// Total
var totalMonthlyPayment = monthlyPrincipalInterest + monthlyTax + monthlyInsurance + hoaFeesMonthly;
// Display Results
document.getElementById('resultsArea').style.display = 'block';
// Format Currency
var formatter = new Intl.NumberFormat('en-US', {
style: 'currency',
currency: 'USD',
});
document.getElementById('resPI').innerText = formatter.format(monthlyPrincipalInterest);
document.getElementById('resTax').innerText = formatter.format(monthlyTax);
document.getElementById('resIns').innerText = formatter.format(monthlyInsurance);
document.getElementById('resHOA').innerText = formatter.format(hoaFeesMonthly);
document.getElementById('resTotal').innerText = formatter.format(totalMonthlyPayment);
}
Mortgage Payment Calculator
30 Years
20 Years
15 Years
10 Years
Principal & Interest:
$0.00
Monthly Property Tax:
$0.00
Monthly Home Insurance:
$0.00
Monthly HOA:
$0.00
Total Monthly Payment:
$0.00
Understanding Your Mortgage Payment
Purchasing a home is one of the most significant financial decisions you will make. This Mortgage Payment Calculator helps you estimate your monthly financial obligation by breaking down the core components of a mortgage payment: Principal, Interest, Taxes, and Insurance (often referred to as PITI).
How We Calculate Your Payment
The calculation is based on standard amortization formulas used by lenders across the United States. Here is a breakdown of the inputs:
- Principal & Interest: This is calculated based on your loan amount (Home Price minus Down Payment), the interest rate, and the loan term. For example, a $280,000 loan at 6.5% interest over 30 years results in a specific monthly debt service.
- Property Tax: Local governments collect these taxes to fund public services. Our calculator divides your annual tax estimate by 12 to find the monthly impact.
- Home Insurance: Lenders require insurance to protect the asset. This annual cost is also divided monthly.
- HOA Fees: If you live in a community with a Homeowners Association, these fees are added directly to your monthly budget, though they are usually paid separately from the mortgage.
Example Calculation
Consider a home price of $350,000 with a 20% down payment ($70,000). This leaves a loan amount of $280,000.
If you secure a 30-year fixed-rate mortgage at 6.5%:
- Your Principal & Interest payment would be approximately $1,770.
- Adding annual taxes of $4,200 ($350/mo) and insurance of $1,200 ($100/mo) brings the total to roughly $2,220 per month.
Use the calculator above to adjust these numbers based on your specific loan offers and local tax rates to get an accurate picture of your housing affordability.