.calc-container {
max-width: 800px;
margin: 20px auto;
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
color: #333;
background: #fff;
border: 1px solid #e0e0e0;
border-radius: 8px;
box-shadow: 0 4px 12px rgba(0,0,0,0.05);
overflow: hidden;
}
.calc-header {
background: #0056b3;
color: white;
padding: 20px;
text-align: center;
}
.calc-header h2 {
margin: 0;
font-size: 24px;
}
.calc-body {
padding: 30px;
display: flex;
flex-wrap: wrap;
gap: 30px;
}
.calc-inputs {
flex: 1;
min-width: 300px;
}
.calc-results {
flex: 1;
min-width: 300px;
background: #f8f9fa;
padding: 20px;
border-radius: 6px;
border: 1px solid #e9ecef;
}
.form-group {
margin-bottom: 15px;
}
.form-group label {
display: block;
margin-bottom: 5px;
font-weight: 600;
font-size: 14px;
color: #555;
}
.form-group input, .form-group select {
width: 100%;
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
font-size: 16px;
box-sizing: border-box;
}
.form-group .input-wrapper {
position: relative;
}
.form-group .symbol {
position: absolute;
left: 10px;
top: 10px;
color: #777;
}
.form-group input.has-symbol {
padding-left: 25px;
}
button.calc-btn {
width: 100%;
padding: 12px;
background: #28a745;
color: white;
border: none;
border-radius: 4px;
font-size: 18px;
font-weight: bold;
cursor: pointer;
transition: background 0.2s;
margin-top: 10px;
}
button.calc-btn:hover {
background: #218838;
}
.result-row {
display: flex;
justify-content: space-between;
margin-bottom: 15px;
padding-bottom: 15px;
border-bottom: 1px solid #ddd;
}
.result-row.final {
border-bottom: none;
margin-top: 20px;
font-size: 1.2em;
color: #0056b3;
font-weight: bold;
}
.result-label {
color: #666;
}
.result-value {
font-weight: bold;
color: #333;
}
.article-section {
max-width: 800px;
margin: 40px auto;
font-family: inherit;
line-height: 1.6;
color: #444;
}
.article-section h2 {
color: #0056b3;
border-bottom: 2px solid #eee;
padding-bottom: 10px;
margin-top: 30px;
}
.article-section ul {
margin-left: 20px;
}
.article-section p {
margin-bottom: 15px;
}
@media (max-width: 600px) {
.calc-body {
flex-direction: column;
}
}
Principal & Interest:
$0.00
Monthly Tax:
$0.00
Monthly Insurance:
$0.00
Monthly HOA:
$0.00
Total Monthly PITI:
$0.00
*PITI = Principal, Interest, Taxes, and Insurance.
function calculateMortgage() {
// Get input values
var homePrice = parseFloat(document.getElementById('homePrice').value);
var downPayment = parseFloat(document.getElementById('downPayment').value);
var interestRate = parseFloat(document.getElementById('interestRate').value);
var loanTerm = parseFloat(document.getElementById('loanTerm').value);
var propertyTax = parseFloat(document.getElementById('propertyTax').value);
var homeInsurance = parseFloat(document.getElementById('homeInsurance').value);
var hoaFees = parseFloat(document.getElementById('hoaFees').value);
// Validation
if (isNaN(homePrice) || isNaN(downPayment) || isNaN(interestRate) || isNaN(loanTerm)) {
alert("Please enter valid numbers for price, down payment, rate, and term.");
return;
}
// Handle defaults for optional fields
if (isNaN(propertyTax)) propertyTax = 0;
if (isNaN(homeInsurance)) homeInsurance = 0;
if (isNaN(hoaFees)) hoaFees = 0;
// Calculations
var loanAmount = homePrice – downPayment;
var monthlyRate = (interestRate / 100) / 12;
var numberOfPayments = loanTerm * 12;
var monthlyPI = 0;
// Mortgage Formula: M = P [ i(1 + i)^n ] / [ (1 + i)^n – 1 ]
if (interestRate === 0) {
monthlyPI = loanAmount / numberOfPayments;
} else {
var x = Math.pow(1 + monthlyRate, numberOfPayments);
monthlyPI = (loanAmount * monthlyRate * x) / (x – 1);
}
var monthlyTax = propertyTax / 12;
var monthlyInsurance = homeInsurance / 12;
var totalMonthlyPayment = monthlyPI + monthlyTax + monthlyInsurance + hoaFees;
// Update DOM
document.getElementById('resultPI').innerText = formatCurrency(monthlyPI);
document.getElementById('resultTax').innerText = formatCurrency(monthlyTax);
document.getElementById('resultIns').innerText = formatCurrency(monthlyInsurance);
document.getElementById('resultHOA').innerText = formatCurrency(hoaFees);
document.getElementById('resultTotal').innerText = formatCurrency(totalMonthlyPayment);
}
function formatCurrency(num) {
return '$' + num.toFixed(2).replace(/\d(?=(\d{3})+\.)/g, '$&,');
}
// Run once on load to show example state
calculateMortgage();
Understanding Your Mortgage PITI Payment
When shopping for a new home, many buyers focus solely on the mortgage principal and interest payments. However, the true cost of homeownership includes several other factors commonly referred to as PITI: Principal, Interest, Taxes, and Insurance. This Mortgage PITI Calculator helps you estimate your total monthly obligation to ensure you stay within your budget.
What is Included in PITI?
Understanding the components of your monthly payment is crucial for financial planning:
- Principal: The portion of your payment that goes toward paying down the loan balance ($350,000 purchase price minus your down payment).
- Interest: The cost of borrowing money, calculated based on your annual interest rate (e.g., 6.5%).
- Taxes: Property taxes assessed by your local government, typically collected monthly by your lender and held in escrow.
- Insurance: Homeowners insurance protects your property against hazards like fire and theft. Like taxes, this is often escrowed.
How the Loan Term Affects Your Payment
The duration of your loan significantly impacts your monthly cash flow. A 30-year fixed mortgage usually offers lower monthly payments because the principal repayment is spread over a longer period. However, you will pay significantly more in total interest compared to a 15-year mortgage. Use the "Loan Term" dropdown in the calculator above to see how switching from 30 years to 15 years changes your PITI.
The Impact of HOA Fees
If you are buying a condo or a home in a planned community, you likely have Homeowners Association (HOA) fees. While these are rarely paid through your mortgage lender, they are a mandatory monthly cost that affects your Debt-to-Income (DTI) ratio. Our calculator includes a field for HOA fees to give you a realistic view of your total monthly housing housing expense.
Example Calculation
Let's say you purchase a home for $350,000 with a $70,000 down payment (20%). If you secure a 30-year loan at a 6.5% interest rate:
- Your loan amount is $280,000.
- Your Principal & Interest (P&I) is approximately $1,770.
- If annual taxes are $4,200 ($350/mo) and insurance is $1,200 ($100/mo).
- Your total PITI would be roughly $2,220 per month.
Use the calculator above to input your specific numbers and plan your purchase with confidence.