.mortgage-calc-wrapper {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
max-width: 800px;
margin: 0 auto;
color: #333;
line-height: 1.6;
}
.calc-container {
background: #f8f9fa;
border: 1px solid #e9ecef;
border-radius: 8px;
padding: 30px;
box-shadow: 0 4px 6px rgba(0,0,0,0.05);
margin-bottom: 40px;
}
.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;
font-weight: 600;
margin-bottom: 5px;
color: #2c3e50;
font-size: 0.9em;
}
.input-wrapper {
position: relative;
display: flex;
align-items: center;
}
.input-prefix, .input-suffix {
position: absolute;
color: #6c757d;
font-weight: 500;
font-size: 0.9em;
}
.input-prefix { left: 12px; }
.input-suffix { right: 12px; }
.calc-input {
width: 100%;
padding: 12px 12px 12px 25px;
border: 1px solid #ced4da;
border-radius: 4px;
font-size: 16px;
transition: border-color 0.15s ease-in-out;
}
.calc-input:focus {
outline: none;
border-color: #007bff;
box-shadow: 0 0 0 3px rgba(0,123,255,0.1);
}
.calc-input.has-suffix {
padding-right: 30px;
padding-left: 12px;
}
.calc-btn {
grid-column: 1 / -1;
background-color: #0056b3;
color: white;
border: none;
padding: 15px;
font-size: 18px;
font-weight: 700;
border-radius: 4px;
cursor: pointer;
margin-top: 10px;
transition: background-color 0.2s;
width: 100%;
}
.calc-btn:hover {
background-color: #004494;
}
.results-area {
grid-column: 1 / -1;
background: #fff;
border: 1px solid #dee2e6;
border-radius: 6px;
padding: 25px;
margin-top: 20px;
display: none;
}
.results-header {
text-align: center;
border-bottom: 2px solid #f1f1f1;
padding-bottom: 15px;
margin-bottom: 15px;
}
.main-result-label {
font-size: 1.1em;
color: #6c757d;
text-transform: uppercase;
letter-spacing: 1px;
}
.main-result-value {
font-size: 3em;
font-weight: 800;
color: #28a745;
margin: 5px 0;
}
.breakdown-grid {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
gap: 15px;
margin-top: 20px;
}
.breakdown-item {
background: #f8f9fa;
padding: 10px;
border-radius: 4px;
text-align: center;
}
.breakdown-label {
font-size: 0.85em;
color: #6c757d;
display: block;
margin-bottom: 5px;
}
.breakdown-value {
font-weight: 700;
color: #333;
font-size: 1.1em;
}
.seo-content h2 {
margin-top: 30px;
color: #2c3e50;
border-bottom: 2px solid #0056b3;
padding-bottom: 10px;
display: inline-block;
}
.seo-content p {
margin-bottom: 15px;
}
.seo-content ul {
margin-bottom: 20px;
padding-left: 20px;
}
.seo-content li {
margin-bottom: 8px;
}
.error-msg {
color: #dc3545;
text-align: center;
grid-column: 1 / -1;
font-weight: 600;
display: none;
}
function calculateMortgage() {
// Get inputs
var price = parseFloat(document.getElementById('homePrice').value);
var down = parseFloat(document.getElementById('downPayment').value);
var termYears = parseFloat(document.getElementById('loanTerm').value);
var annualRate = parseFloat(document.getElementById('interestRate').value);
var taxYearly = parseFloat(document.getElementById('propTax').value);
var insYearly = parseFloat(document.getElementById('homeIns').value);
var hoaMonthly = parseFloat(document.getElementById('hoaFees').value);
// Error handling elements
var errorDiv = document.getElementById('errorMsg');
var resultDiv = document.getElementById('calcResults');
// Validation
if (isNaN(price) || isNaN(down) || isNaN(termYears) || isNaN(annualRate) ||
isNaN(taxYearly) || isNaN(insYearly) || isNaN(hoaMonthly) ||
price < 0 || down < 0 || termYears <= 0 || annualRate < 0) {
errorDiv.style.display = 'block';
resultDiv.style.display = 'none';
return;
}
errorDiv.style.display = 'none';
// Main Calculations
var principal = price – down;
// Handle 100% down payment or 0 principal edge case
if (principal <= 0) {
var monthlyPI = 0;
var totalInterest = 0;
} else {
// Rate calculation
var monthlyRate = (annualRate / 100) / 12;
var numberOfPayments = termYears * 12;
// Mortgage Formula: M = P [ i(1 + i)^n ] / [ (1 + i)^n – 1 ]
if (annualRate === 0) {
var monthlyPI = principal / numberOfPayments;
} else {
var monthlyPI = principal * ( (monthlyRate * Math.pow(1 + monthlyRate, numberOfPayments)) / (Math.pow(1 + monthlyRate, numberOfPayments) – 1) );
}
var totalInterest = (monthlyPI * numberOfPayments) – principal;
}
// Tax and Insurance monthly breakdown
var monthlyTax = taxYearly / 12;
var monthlyIns = insYearly / 12;
// Total Monthly Payment
var totalMonthlyPayment = monthlyPI + monthlyTax + monthlyIns + hoaMonthly;
// Update UI
document.getElementById('totalMonthly').innerHTML = '$' + totalMonthlyPayment.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('resPI').innerHTML = '$' + monthlyPI.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('resTax').innerHTML = '$' + monthlyTax.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('resIns').innerHTML = '$' + monthlyIns.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('resTotalInt').innerHTML = '$' + totalInterest.toLocaleString('en-US', {minimumFractionDigits: 0, maximumFractionDigits: 0});
// Show results
resultDiv.style.display = 'block';
}
Monthly Mortgage Payment Calculator
$
$
yrs
%
$
$
$
Please enter valid positive numbers for all fields.
Estimated Monthly Payment
Includes P&I, Taxes, Insurance, & HOA
Principal & Interest
Property Tax
Home Insurance
Total Interest Paid
Understanding Your Mortgage Calculation
Purchasing a home is one of the most significant financial decisions you will make. This Mortgage Calculator is designed to provide a comprehensive breakdown of your monthly financial obligations. Unlike simple calculators that only look at principal and interest, this tool factors in the crucial "hidden" costs of homeownership: property taxes, homeowners insurance, and HOA fees.
What is PITI?
In the mortgage industry, your total monthly payment is often referred to as PITI. It stands for:
- Principal: The portion of your payment that goes toward paying down the loan balance.
- Interest: The cost of borrowing the money, paid to the lender.
- Taxes: Property taxes assessed by your local government, typically held in an escrow account.
- Insurance: Homeowners insurance to protect against damage, also usually paid via escrow.
How Interest Rates Impact Your Loan
Even a small difference in your interest rate can dramatically change your monthly payment and the total cost of the loan over 30 years. For example, on a $400,000 loan, a difference of just 1% in the interest rate can change your monthly payment by over $250 and save (or cost) you nearly $100,000 in total interest paid over the life of the loan.
Lowering Your Monthly Payment
If the estimated payment looks too high for your budget, consider these strategies:
- Increase your down payment: This lowers the principal amount you need to borrow.
- Improve your credit score: A higher score often qualifies you for a lower interest rate.
- Shop for insurance: Homeowners insurance rates vary significantly between providers.
- Consider a longer term: While a 30-year term accumulates more total interest than a 15-year term, the monthly payments are significantly lower.
Using This Calculator
Enter the current home price and your planned down payment. Don't forget to include estimates for annual property taxes (typically 0.8% to 2% of home value depending on location) and insurance costs to get the most accurate result.