#mortgage-calculator-wrapper .calc-row { display: flex; flex-wrap: wrap; gap: 20px; margin-bottom: 15px; }
#mortgage-calculator-wrapper .calc-col { flex: 1; min-width: 250px; }
#mortgage-calculator-wrapper label { display: block; font-weight: bold; margin-bottom: 5px; color: #333; }
#mortgage-calculator-wrapper input { width: 100%; padding: 10px; border: 1px solid #ccc; border-radius: 4px; box-sizing: border-box; font-size: 16px; }
#mortgage-calculator-wrapper button { width: 100%; padding: 12px; background-color: #2c3e50; color: white; border: none; border-radius: 4px; font-size: 18px; cursor: pointer; transition: background 0.3s; }
#mortgage-calculator-wrapper button:hover { background-color: #1a252f; }
#mortgage-calculator-wrapper .calc-results { background-color: #ffffff; padding: 20px; border-radius: 6px; border-left: 5px solid #27ae60; margin-top: 20px; display: none; }
#mortgage-calculator-wrapper .result-row { display: flex; justify-content: space-between; margin-bottom: 10px; font-size: 16px; }
#mortgage-calculator-wrapper .result-total { font-size: 20px; font-weight: bold; color: #27ae60; border-top: 1px solid #eee; padding-top: 10px; margin-top: 10px; }
#mortgage-calculator-wrapper .error-msg { color: #c0392b; display: none; margin-bottom: 15px; }
#mortgage-calculator-wrapper h2 { margin-top: 0; color: #2c3e50; }
#mortgage-calculator-wrapper .seo-content { margin-top: 40px; line-height: 1.6; color: #444; }
#mortgage-calculator-wrapper .seo-content h3 { color: #2c3e50; margin-top: 25px; }
function calculateMortgage() {
// Get Input Elements
var homePriceInput = document.getElementById("homePrice");
var downPaymentInput = document.getElementById("downPayment");
var loanTermInput = document.getElementById("loanTerm");
var interestRateInput = document.getElementById("interestRate");
var propertyTaxInput = document.getElementById("propertyTax");
var homeInsuranceInput = document.getElementById("homeInsurance");
// Get Result Elements
var resultsArea = document.getElementById("resultsArea");
var monthlyPIDisplay = document.getElementById("monthlyPI");
var monthlyTaxDisplay = document.getElementById("monthlyTax");
var monthlyInsDisplay = document.getElementById("monthlyIns");
var totalMonthlyDisplay = document.getElementById("totalMonthly");
var totalInterestDisplay = document.getElementById("totalInterest");
var errorMsg = document.getElementById("calcError");
// Parse Values
var price = parseFloat(homePriceInput.value);
var down = parseFloat(downPaymentInput.value);
var years = parseFloat(loanTermInput.value);
var rate = parseFloat(interestRateInput.value);
var taxYear = parseFloat(propertyTaxInput.value);
var insYear = parseFloat(homeInsuranceInput.value);
// Validation
if (isNaN(price) || isNaN(down) || isNaN(years) || isNaN(rate) || price <= 0 || years <= 0) {
errorMsg.style.display = "block";
resultsArea.style.display = "none";
return;
}
// Handle optional fields as 0 if empty
if (isNaN(taxYear)) taxYear = 0;
if (isNaN(insYear)) insYear = 0;
errorMsg.style.display = "none";
// Calculation Logic
var principal = price – down;
if (principal <= 0) {
errorMsg.innerHTML = "Down payment cannot exceed home price.";
errorMsg.style.display = "block";
resultsArea.style.display = "none";
return;
}
var monthlyRate = rate / 100 / 12;
var numberOfPayments = years * 12;
// Calculate Monthly Principal & Interest
var monthlyPI = 0;
if (rate === 0) {
monthlyPI = principal / numberOfPayments;
} else {
monthlyPI = principal * ( (monthlyRate * Math.pow(1 + monthlyRate, numberOfPayments)) / (Math.pow(1 + monthlyRate, numberOfPayments) – 1) );
}
// Calculate Other Components
var monthlyTax = taxYear / 12;
var monthlyIns = insYear / 12;
var totalMonthly = monthlyPI + monthlyTax + monthlyIns;
var totalCost = monthlyPI * numberOfPayments;
var totalInterest = totalCost – principal;
// Update DOM
monthlyPIDisplay.innerText = "$" + monthlyPI.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2});
monthlyTaxDisplay.innerText = "$" + monthlyTax.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2});
monthlyInsDisplay.innerText = "$" + monthlyIns.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2});
totalMonthlyDisplay.innerText = "$" + totalMonthly.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2});
totalInterestDisplay.innerText = "$" + totalInterest.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2});
// Show Results
resultsArea.style.display = "block";
}
Mortgage Payment Calculator
Estimate your monthly mortgage payments including principal, interest, taxes, and insurance.
Please enter valid numeric values for all fields.
Principal & Interest:
$0.00
Property Tax (Monthly):
$0.00
Home Insurance (Monthly):
$0.00
Total Monthly Payment:
$0.00
Total Interest Paid Over Loan:
$0.00
Understanding Your Mortgage Payment
Purchasing a home is one of the largest financial decisions most people make. A mortgage calculator is an essential tool to understand your long-term financial commitments. By breaking down the components of your monthly payment, you can determine exactly how much house you can afford and how changes in interest rates or down payments affect your budget.
Components of a Mortgage Payment
Your monthly payment is typically composed of four main parts, often referred to as PITI:
- Principal: The money you borrowed to buy the home. A portion of each payment reduces this balance.
- Interest: The cost of borrowing the money. In the early years of a mortgage, a larger percentage of your payment goes toward interest.
- Taxes: Property taxes charged by your local government, usually collected by the lender and held in escrow.
- Insurance: Homeowners insurance protects your property against damage. Lenders require this to protect their investment.
How Interest Rates Affect Your Loan
Even a small difference in your interest rate can have a massive impact on your monthly payment and the total cost of the loan. For example, on a $300,000 loan, a 1% increase in interest rate can increase your monthly payment by hundreds of dollars and your total interest paid by tens of thousands over a 30-year term. Using this calculator helps you visualize these scenarios.
Why the Down Payment Matters
Your down payment reduces the principal amount you need to borrow. Generally, a larger down payment leads to lower monthly payments and less interest paid over the life of the loan. Additionally, if you put down less than 20%, you may be required to pay Private Mortgage Insurance (PMI), which would further increase your monthly costs.