.calculator-container {
max-width: 800px;
margin: 0 auto;
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
color: #333;
line-height: 1.6;
}
.calc-wrapper {
background: #f8f9fa;
padding: 30px;
border-radius: 12px;
box-shadow: 0 4px 6px rgba(0,0,0,0.1);
margin-bottom: 40px;
border: 1px solid #e9ecef;
}
.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: 8px;
font-weight: 600;
font-size: 14px;
color: #495057;
}
.input-wrapper {
position: relative;
display: flex;
align-items: center;
}
.input-prefix, .input-suffix {
position: absolute;
color: #6c757d;
font-size: 14px;
}
.input-prefix { left: 12px; }
.input-suffix { right: 12px; }
.calc-input {
width: 100%;
padding: 12px;
padding-left: 25px; /* Adjust for prefix */
border: 1px solid #ced4da;
border-radius: 6px;
font-size: 16px;
transition: border-color 0.15s ease-in-out;
box-sizing: border-box;
}
.calc-input:focus {
border-color: #007bff;
outline: 0;
box-shadow: 0 0 0 0.2rem rgba(0,123,255,.25);
}
.calc-btn {
grid-column: 1 / -1;
background-color: #0056b3;
color: white;
border: none;
padding: 15px;
font-size: 18px;
font-weight: 700;
border-radius: 6px;
cursor: pointer;
transition: background-color 0.2s;
margin-top: 10px;
width: 100%;
}
.calc-btn:hover {
background-color: #004494;
}
.result-box {
grid-column: 1 / -1;
background: #ffffff;
padding: 20px;
border-radius: 8px;
margin-top: 20px;
border-left: 5px solid #28a745;
display: none;
}
.result-row {
display: flex;
justify-content: space-between;
margin-bottom: 10px;
border-bottom: 1px solid #eee;
padding-bottom: 5px;
}
.result-row:last-child {
border-bottom: none;
margin-bottom: 0;
padding-bottom: 0;
font-weight: bold;
font-size: 1.2em;
color: #28a745;
margin-top: 10px;
padding-top: 10px;
border-top: 2px solid #eee;
}
.article-content h2 {
color: #2c3e50;
border-bottom: 2px solid #0056b3;
padding-bottom: 10px;
margin-top: 40px;
}
.article-content h3 {
color: #34495e;
margin-top: 25px;
}
.article-content ul {
padding-left: 20px;
}
.article-content li {
margin-bottom: 10px;
}
function calculateMortgage() {
// Get inputs
var price = parseFloat(document.getElementById('mg-price').value) || 0;
var down = parseFloat(document.getElementById('mg-down').value) || 0;
var termYears = parseFloat(document.getElementById('mg-term').value) || 0;
var rateAnnual = parseFloat(document.getElementById('mg-rate').value) || 0;
var taxAnnual = parseFloat(document.getElementById('mg-tax').value) || 0;
var insuranceAnnual = parseFloat(document.getElementById('mg-insurance').value) || 0;
var hoaMonthly = parseFloat(document.getElementById('mg-hoa').value) || 0;
// Validation basics
if (price <= 0 || termYears <= 0) {
alert("Please enter a valid home price and loan term.");
return;
}
// Calculations
var principal = price – down;
if (principal < 0) principal = 0;
var monthlyRate = (rateAnnual / 100) / 12;
var totalMonths = termYears * 12;
var monthlyPI = 0;
if (rateAnnual === 0) {
monthlyPI = principal / totalMonths;
} else {
// Standard Amortization Formula: M = P [ i(1 + i)^n ] / [ (1 + i)^n – 1 ]
var x = Math.pow(1 + monthlyRate, totalMonths);
monthlyPI = principal * ((monthlyRate * x) / (x – 1));
}
var monthlyTax = taxAnnual / 12;
var monthlyIns = insuranceAnnual / 12;
var totalMonthly = monthlyPI + monthlyTax + monthlyIns + hoaMonthly;
// Format Currency Function
function formatMoney(num) {
return "$" + num.toLocaleString('en-US', { minimumFractionDigits: 2, maximumFractionDigits: 2 });
}
// Update DOM
document.getElementById('res-pi').innerText = formatMoney(monthlyPI);
document.getElementById('res-tax').innerText = formatMoney(monthlyTax);
document.getElementById('res-ins').innerText = formatMoney(monthlyIns);
document.getElementById('res-hoa').innerText = formatMoney(hoaMonthly);
document.getElementById('res-total').innerText = formatMoney(totalMonthly);
// Show Result
document.getElementById('mg-result').style.display = 'block';
}
Mortgage Payment Estimator
$
$
Yrs
%
$
$
$
Principal & Interest:
$0.00
Property Tax:
$0.00
Home Insurance:
$0.00
HOA Fees:
$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 in your lifetime. Understanding exactly how your monthly payment is calculated is crucial for maintaining your budget and financial health. This calculator breaks down the PITI (Principal, Interest, Taxes, and Insurance) components to give you a realistic view of your housing costs.
The Components of a Mortgage Payment (PITI)
Your monthly check to the lender covers more than just the loan balance. Here is what is typically included:
- Principal: The portion of your payment that goes toward reducing the amount you borrowed. In the early years of a 30-year loan, this is usually small compared to the interest.
- Interest: The cost of borrowing money. This is calculated based on your remaining principal balance and your annual interest rate.
- Taxes: Property taxes assessed by your local government. Lenders often collect this monthly and hold it in an escrow account to pay the bill when it's due.
- Insurance: Homeowners insurance protects your property against damage. Like taxes, this is often paid through escrow.
How Interest Rates Affect Affordability
Even a small change in interest rates can drastically alter your monthly payment and the total cost of the loan. For example, on a $300,000 loan:
- At 5.0%, the P&I payment is roughly $1,610.
- At 7.0%, the P&I payment jumps to roughly $1,996.
That difference of nearly $400 a month adds up to over $140,000 in extra interest over the life of a 30-year loan.
Private Mortgage Insurance (PMI)
If your down payment is less than 20% of the home price, lenders usually require Private Mortgage Insurance (PMI). While this calculator includes fields for standard insurance, remember that PMI can add 0.5% to 1% of the loan amount annually to your costs until you reach 20% equity.