.seocalc-container {
max-width: 800px;
margin: 30px auto;
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
color: #333;
background: #fff;
border: 1px solid #e1e1e1;
border-radius: 8px;
box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}
.seocalc-header {
background: #2c3e50;
color: white;
padding: 20px;
border-radius: 8px 8px 0 0;
text-align: center;
}
.seocalc-header h3 {
margin: 0;
font-size: 24px;
}
.seocalc-content {
padding: 30px;
display: flex;
flex-wrap: wrap;
gap: 30px;
}
.seocalc-inputs {
flex: 1;
min-width: 280px;
}
.seocalc-results {
flex: 1;
min-width: 280px;
background: #f8f9fa;
padding: 20px;
border-radius: 6px;
border: 1px solid #eee;
}
.seocalc-form-group {
margin-bottom: 20px;
}
.seocalc-form-group label {
display: block;
margin-bottom: 8px;
font-weight: 600;
font-size: 14px;
color: #444;
}
.seocalc-input-wrapper {
position: relative;
display: flex;
align-items: center;
}
.seocalc-input-wrapper span {
position: absolute;
left: 10px;
color: #777;
z-index: 10;
}
.seocalc-input-wrapper input {
width: 100%;
padding: 10px 10px 10px 25px;
border: 1px solid #ddd;
border-radius: 4px;
font-size: 16px;
transition: border-color 0.2s;
}
.seocalc-input-wrapper input:focus {
border-color: #3498db;
outline: none;
}
.seocalc-suffix input {
padding: 10px 30px 10px 10px;
}
.seocalc-suffix span {
left: auto;
right: 10px;
}
.seocalc-btn {
width: 100%;
padding: 12px;
background: #3498db;
color: white;
border: none;
border-radius: 4px;
font-size: 16px;
font-weight: bold;
cursor: pointer;
transition: background 0.2s;
}
.seocalc-btn:hover {
background: #2980b9;
}
.result-row {
display: flex;
justify-content: space-between;
margin-bottom: 15px;
font-size: 15px;
}
.result-total {
margin-top: 20px;
padding-top: 20px;
border-top: 2px solid #ddd;
font-weight: bold;
font-size: 18px;
color: #2c3e50;
}
.result-value {
font-weight: 700;
}
.seocalc-article {
max-width: 800px;
margin: 40px auto;
line-height: 1.6;
color: #444;
}
.seocalc-article h2 {
color: #2c3e50;
margin-top: 30px;
}
.seocalc-article p {
margin-bottom: 15px;
}
.seocalc-article ul {
margin-bottom: 20px;
padding-left: 20px;
}
.seocalc-article li {
margin-bottom: 8px;
}
Monthly Breakdown
Principal & Interest:
$1,769.79
Property Tax:
$375.00
Home Insurance:
$100.00
Total Monthly Payment:
$2,244.79
Loan Details:
Loan Amount: $280,000
Total Interest Paid: $357,123
function calculateMortgage() {
var homePrice = parseFloat(document.getElementById('homePrice').value);
var downPayment = parseFloat(document.getElementById('downPayment').value);
var rate = parseFloat(document.getElementById('interestRate').value);
var years = parseFloat(document.getElementById('loanTerm').value);
var annualTax = parseFloat(document.getElementById('propertyTax').value);
var annualIns = parseFloat(document.getElementById('insurance').value);
// Validation
if (isNaN(homePrice) || isNaN(downPayment) || isNaN(rate) || isNaN(years)) {
alert("Please enter valid numbers for all fields.");
return;
}
// Logic
var loanAmount = homePrice – downPayment;
var monthlyRate = (rate / 100) / 12;
var totalPayments = years * 12;
var monthlyPI = 0;
// Check if interest rate is 0
if (rate === 0) {
monthlyPI = loanAmount / totalPayments;
} else {
// Amortization Formula: M = P [ i(1 + i)^n ] / [ (1 + i)^n – 1]
monthlyPI = loanAmount * (monthlyRate * Math.pow(1 + monthlyRate, totalPayments)) / (Math.pow(1 + monthlyRate, totalPayments) – 1);
}
var monthlyTax = annualTax / 12;
var monthlyIns = annualIns / 12;
var totalMonthly = monthlyPI + monthlyTax + monthlyIns;
var totalCost = (monthlyPI * totalPayments);
var totalInterest = totalCost – loanAmount;
// Display Results with formatting
var formatter = new Intl.NumberFormat('en-US', {
style: 'currency',
currency: 'USD',
minimumFractionDigits: 2
});
document.getElementById('resPI').innerHTML = formatter.format(monthlyPI);
document.getElementById('resTax').innerHTML = formatter.format(monthlyTax);
document.getElementById('resIns').innerHTML = formatter.format(monthlyIns);
document.getElementById('resTotal').innerHTML = formatter.format(totalMonthly);
document.getElementById('resLoanAmount').innerHTML = formatter.format(loanAmount);
document.getElementById('resTotalInterest').innerHTML = formatter.format(totalInterest);
}
Understanding Your Mortgage Payment
Calculating your potential mortgage payment is the first critical step in the home buying process. This tool is designed to provide a comprehensive look at what your monthly financial obligation will be, known in the real estate industry as PITI (Principal, Interest, Taxes, and Insurance).
How is Your Mortgage Calculated?
Most borrowers focus solely on the loan repayment, but a realistic monthly budget must include four key components:
- Principal: The portion of your payment that pays down the loan balance ($280,000 in the default example above).
- Interest: The cost of borrowing money. With a standard fixed-rate mortgage, your interest payments are higher at the beginning of the term and decrease over time.
- Taxes: Property taxes are typically collected by your lender in an escrow account and paid annually to your local government. These vary significantly by location.
- Insurance: Homeowners insurance protects your property against damage and liability. Lenders require this to protect the asset securing the loan.
The Impact of Interest Rates and Term Length
Even a small change in your interest rate can dramatically affect your monthly payment and the total cost of the loan. For example, on a $300,000 loan, the difference between a 6.0% and a 7.0% rate can add hundreds of dollars to your monthly bill and tens of thousands over the life of the loan.
Similarly, the loan term matters. A 15-year mortgage will have higher monthly payments than a 30-year mortgage, but you will pay significantly less in total interest because the bank's capital is returned faster. Use the calculator above to compare how adjusting the "Loan Term" from 30 to 15 years impacts your total interest paid.
Tips for Lowering Your Payment
If the calculated payment is higher than your budget allows (typically recommended to be no more than 28% of your gross monthly income), consider these strategies:
- Increase your Down Payment: This lowers the principal loan amount and reduces your monthly obligation.
- Improve your Credit Score: Higher credit scores often qualify for lower interest rates.
- Shop for Insurance: Homeowners insurance rates vary by provider; shopping around can save $20-$50 per month.