.mortgage-calculator-wrapper {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
max-width: 800px;
margin: 0 auto;
background: #ffffff;
border: 1px solid #e2e8f0;
border-radius: 8px;
box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
padding: 0;
}
.mc-header {
background: #2c3e50;
color: white;
padding: 20px;
border-radius: 8px 8px 0 0;
text-align: center;
}
.mc-header h2 {
margin: 0;
font-size: 1.5rem;
}
.mc-body {
padding: 25px;
display: flex;
flex-wrap: wrap;
gap: 30px;
}
.mc-inputs {
flex: 1;
min-width: 300px;
}
.mc-results {
flex: 1;
min-width: 300px;
background: #f8fafc;
padding: 20px;
border-radius: 8px;
border: 1px solid #e2e8f0;
display: flex;
flex-direction: column;
justify-content: center;
}
.form-group {
margin-bottom: 15px;
}
.form-group label {
display: block;
font-weight: 600;
font-size: 0.9rem;
margin-bottom: 5px;
color: #4a5568;
}
.input-wrapper {
position: relative;
display: flex;
align-items: center;
}
.input-prefix, .input-suffix {
position: absolute;
color: #718096;
font-size: 0.9rem;
}
.input-prefix { left: 10px; }
.input-suffix { right: 10px; }
.form-control {
width: 100%;
padding: 10px 12px;
padding-left: 25px; /* adjust based on prefix */
border: 1px solid #cbd5e0;
border-radius: 4px;
font-size: 1rem;
transition: border-color 0.2s;
box-sizing: border-box;
}
.form-control:focus {
border-color: #3182ce;
outline: none;
box-shadow: 0 0 0 3px rgba(49, 130, 206, 0.1);
}
.form-control.has-suffix {
padding-right: 25px;
padding-left: 10px;
}
.btn-calc {
width: 100%;
background: #3182ce;
color: white;
border: none;
padding: 12px;
font-size: 1rem;
font-weight: bold;
border-radius: 4px;
cursor: pointer;
transition: background 0.2s;
margin-top: 10px;
}
.btn-calc:hover {
background: #2b6cb0;
}
.result-row {
display: flex;
justify-content: space-between;
align-items: center;
margin-bottom: 12px;
padding-bottom: 12px;
border-bottom: 1px solid #e2e8f0;
}
.result-row:last-child {
border-bottom: none;
margin-bottom: 0;
padding-bottom: 0;
}
.result-label {
color: #718096;
font-size: 0.95rem;
}
.result-value {
font-weight: 700;
color: #2d3748;
font-size: 1.1rem;
}
.total-payment {
background: #2c3e50;
color: white;
padding: 15px;
border-radius: 6px;
text-align: center;
margin-bottom: 20px;
}
.total-payment .tp-label {
font-size: 0.9rem;
text-transform: uppercase;
letter-spacing: 1px;
opacity: 0.9;
margin-bottom: 5px;
}
.total-payment .tp-value {
font-size: 2rem;
font-weight: 800;
}
.calc-content {
margin-top: 40px;
color: #2d3748;
line-height: 1.6;
padding: 0 10px;
}
.calc-content h3 {
color: #2c3e50;
font-size: 1.5rem;
margin-bottom: 15px;
margin-top: 30px;
}
.calc-content p {
margin-bottom: 15px;
font-size: 1.05rem;
}
.calc-content ul {
margin-bottom: 20px;
padding-left: 20px;
}
.calc-content li {
margin-bottom: 8px;
}
@media (max-width: 600px) {
.mc-body {
flex-direction: column;
}
.mc-inputs, .mc-results {
min-width: 100%;
}
}
Estimated Monthly Payment
$0.00
Principal & Interest:
$0.00
Property Tax:
$0.00
Home Insurance:
$0.00
HOA Fees:
$0.00
Loan Amount:
$0.00
Total Interest Paid:
$0.00
Understanding Your Mortgage Payment
Calculating your monthly mortgage payment is a critical step in the home buying process. This advanced mortgage calculator breaks down the total cost of homeownership, not just the principal and interest. By including property taxes, homeowners insurance, and HOA fees, you get a realistic view of your monthly financial commitment.
What is Included in a Mortgage Payment?
A typical monthly mortgage payment consists of four main components, often referred to as PITI:
- Principal: The portion of the payment that reduces the loan balance.
- Interest: The cost of borrowing money from the lender.
- Taxes: Property taxes charged by your local government, typically held in escrow.
- Insurance: Homeowners insurance to protect against damage and liability.
How Interest Rates Affect Your Payment
Even a small difference in interest rates can have a significant impact on your monthly payment and the total interest paid over the life of the loan. For example, on a $300,000 loan, a 1% increase in interest rate can increase your monthly payment by over $180 and cost you over $60,000 in additional interest over 30 years.
The Impact of the Loan Term
Most homebuyers choose between a 15-year and a 30-year mortgage term. A 30-year term offers lower monthly payments, making the home more affordable on a monthly basis. However, a 15-year term will save you a substantial amount in total interest costs and allow you to build equity much faster.
Using this Calculator for Planning
Use the inputs above to experiment with different scenarios. Try increasing your down payment to see how it lowers your monthly obligation, or adjust the home price to determine your maximum budget. Remember to verify current property tax rates in your target area, as these can vary significantly by county.
function calculateMortgage() {
// 1. 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 loanTermYears = parseFloat(document.getElementById("loanTerm").value);
var propertyTaxAnnual = parseFloat(document.getElementById("propertyTax").value);
var homeInsuranceAnnual = parseFloat(document.getElementById("homeInsurance").value);
var hoaFeesMonthly = parseFloat(document.getElementById("hoaFees").value);
// Validation to prevent NaN errors
if (isNaN(homePrice)) homePrice = 0;
if (isNaN(downPayment)) downPayment = 0;
if (isNaN(interestRate)) interestRate = 0;
if (isNaN(loanTermYears)) loanTermYears = 30;
if (isNaN(propertyTaxAnnual)) propertyTaxAnnual = 0;
if (isNaN(homeInsuranceAnnual)) homeInsuranceAnnual = 0;
if (isNaN(hoaFeesMonthly)) hoaFeesMonthly = 0;
// 2. Perform Calculations
var loanAmount = homePrice – downPayment;
// Handle case where down payment is greater than price
if (loanAmount 0 && loanAmount > 0) {
monthlyPrincipalAndInterest = loanAmount *
(monthlyInterestRate * Math.pow(1 + monthlyInterestRate, numberOfPayments)) /
(Math.pow(1 + monthlyInterestRate, numberOfPayments) – 1);
} else if (loanAmount > 0) {
// If interest is 0%
monthlyPrincipalAndInterest = loanAmount / numberOfPayments;
}
var monthlyPropertyTax = propertyTaxAnnual / 12;
var monthlyInsurance = homeInsuranceAnnual / 12;
var totalMonthlyPayment = monthlyPrincipalAndInterest + monthlyPropertyTax + monthlyInsurance + hoaFeesMonthly;
var totalInterestPaid = (monthlyPrincipalAndInterest * numberOfPayments) – loanAmount;
if (totalInterestPaid < 0) totalInterestPaid = 0;
// 3. Update UI
// Helper for currency formatting
var formatter = new Intl.NumberFormat('en-US', {
style: 'currency',
currency: 'USD',
minimumFractionDigits: 2,
maximumFractionDigits: 2
});
document.getElementById("totalMonthlyPayment").innerHTML = formatter.format(totalMonthlyPayment);
document.getElementById("piPayment").innerHTML = formatter.format(monthlyPrincipalAndInterest);
document.getElementById("taxPayment").innerHTML = formatter.format(monthlyPropertyTax);
document.getElementById("insPayment").innerHTML = formatter.format(monthlyInsurance);
document.getElementById("hoaPayment").innerHTML = formatter.format(hoaFeesMonthly);
document.getElementById("loanAmountResult").innerHTML = formatter.format(loanAmount);
document.getElementById("totalInterestResult").innerHTML = formatter.format(totalInterestPaid);
}
// Run calculation on load with default values
window.onload = function() {
calculateMortgage();
};