.calculator-wrapper {
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-container {
background: #ffffff;
padding: 30px;
border-radius: 8px;
box-shadow: 0 4px 20px rgba(0,0,0,0.1);
margin-bottom: 40px;
border: 1px solid #e1e1e1;
}
.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;
font-size: 14px;
color: #444;
}
.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: #0073aa;
outline: none;
box-shadow: 0 0 0 2px rgba(0,115,170,0.2);
}
.calc-btn {
background-color: #0073aa;
color: white;
border: none;
padding: 12px 24px;
font-size: 16px;
font-weight: bold;
border-radius: 4px;
cursor: pointer;
width: 100%;
margin-top: 10px;
transition: background 0.3s;
}
.calc-btn:hover {
background-color: #005177;
}
.results-box {
background: #f8f9fa;
padding: 20px;
border-radius: 6px;
margin-top: 25px;
border-left: 5px solid #0073aa;
display: none;
}
.result-row {
display: flex;
justify-content: space-between;
margin-bottom: 10px;
font-size: 15px;
border-bottom: 1px solid #eee;
padding-bottom: 5px;
}
.result-row.total {
border-bottom: none;
font-weight: 800;
font-size: 20px;
color: #0073aa;
margin-top: 15px;
padding-top: 10px;
border-top: 2px solid #ddd;
}
.seo-content h2 {
color: #2c3e50;
margin-top: 30px;
}
.seo-content p {
margin-bottom: 15px;
}
.seo-content ul {
margin-bottom: 20px;
padding-left: 20px;
}
.seo-content li {
margin-bottom: 8px;
}
.error-msg {
color: #d63031;
font-size: 14px;
margin-top: 5px;
display: none;
}
function calculateMortgage() {
// 1. Get DOM elements
var homeValueInput = document.getElementById('homeValue');
var downPaymentInput = document.getElementById('downPayment');
var interestRateInput = document.getElementById('interestRate');
var loanTermInput = document.getElementById('loanTerm');
var propertyTaxInput = document.getElementById('propertyTax');
var homeInsuranceInput = document.getElementById('homeInsurance');
var pmiCostInput = document.getElementById('pmiCost');
var hoaFeesInput = document.getElementById('hoaFees');
var resultBox = document.getElementById('results');
var errorMsg = document.getElementById('error-message');
// 2. Parse values
var homeValue = parseFloat(homeValueInput.value);
var downPayment = parseFloat(downPaymentInput.value) || 0;
var annualRate = parseFloat(interestRateInput.value);
var years = parseInt(loanTermInput.value);
var annualTax = parseFloat(propertyTaxInput.value) || 0;
var annualIns = parseFloat(homeInsuranceInput.value) || 0;
var monthlyPMI = parseFloat(pmiCostInput.value) || 0;
var monthlyHOA = parseFloat(hoaFeesInput.value) || 0;
// 3. Validation
if (isNaN(homeValue) || isNaN(annualRate) || homeValue <= 0 || annualRate < 0) {
errorMsg.style.display = 'block';
resultBox.style.display = 'none';
return;
}
errorMsg.style.display = 'none';
// 4. Calculations
var loanAmount = homeValue – downPayment;
if (loanAmount <= 0) {
loanAmount = 0;
}
var monthlyRate = (annualRate / 100) / 12;
var totalPayments = years * 12;
// Calculate Principal & Interest (P&I)
// Formula: M = P [ i(1 + i)^n ] / [ (1 + i)^n – 1]
var monthlyPI = 0;
if (monthlyRate === 0) {
monthlyPI = loanAmount / totalPayments;
} else {
monthlyPI = loanAmount * ( (monthlyRate * Math.pow(1 + monthlyRate, totalPayments)) / (Math.pow(1 + monthlyRate, totalPayments) – 1) );
}
// Calculate Escrow components
var monthlyTax = annualTax / 12;
var monthlyIns = annualIns / 12;
var totalFees = monthlyPMI + monthlyHOA;
var totalMonthlyPayment = monthlyPI + monthlyTax + monthlyIns + totalFees;
// 5. Update DOM with Results
document.getElementById('res-pi').innerText = '$' + monthlyPI.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('res-tax').innerText = '$' + monthlyTax.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('res-ins').innerText = '$' + monthlyIns.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('res-fees').innerText = '$' + totalFees.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('res-total').innerText = '$' + totalMonthlyPayment.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('res-loan-amount').innerText = '$' + loanAmount.toLocaleString('en-US');
resultBox.style.display = 'block';
}
Mortgage Payment Calculator
30 Years
20 Years
15 Years
10 Years
Private Mortgage Insurance (if applicable)
Please enter valid positive numbers for Home Value and Interest Rate.
Estimated Monthly Payment
Principal & Interest:
$0.00
Property Taxes:
$0.00
Home Insurance:
$0.00
HOA & PMI:
$0.00
Total Monthly Payment:
$0.00
Total Loan Amount: $0
Understanding Your Mortgage Payment
Buying a home is one of the most significant financial decisions you will make. This Mortgage Payment Calculator helps you estimate your monthly financial commitment by accounting for all the major components of a housing payment, not just the loan principal and interest.
Components of a Mortgage Payment (PITI)
When lenders look at your ability to repay a loan, they calculate "PITI". Here is what that includes:
- Principal: The portion of your payment that pays down the loan balance.
- Interest: The cost of borrowing money from the lender.
- Taxes: Property taxes assessed by your local government, usually paid into an escrow account monthly.
- Insurance: Homeowners insurance to protect against fire, theft, and liability.
What is PMI?
If your down payment is less than 20% of the home's value, lenders usually require Private Mortgage Insurance (PMI). This protects the lender if you stop making payments. Our calculator allows you to input a specific monthly PMI amount to see how it affects your total budget.
How Interest Rates Affect Your Buying Power
Even a small change in interest rates can significantly impact your monthly payment. For example, on a $300,000 loan, the difference between a 6% and a 7% interest rate is roughly $200 per month. Use the input fields above to test different rate scenarios and find a loan structure that fits your monthly budget.
HOA Fees
If you are buying a condo or a home in a planned community, do not forget to include Homeowners Association (HOA) fees. While these are usually paid directly to the association rather than the lender, they are a mandatory monthly cost that impacts your debt-to-income ratio.