Estimate your monthly payments including principal, interest, taxes, and insurance.
30 Years
20 Years
15 Years
10 Years
Your Estimated Total Monthly Payment:
$0.00
Principal & Interest$0.00
Property Tax (Mo)$0.00
Home Insurance (Mo)$0.00
Total Loan Amount: $0
Understanding Your Mortgage Payment (PITI)
When planning to buy a home, focusing solely on the listing price can be misleading. A comprehensive understanding of your monthly financial commitment requires looking at the four major components of a mortgage payment, commonly referred to by the acronym PITI:
1. Principal
This is the portion of your payment that goes directly toward paying down the outstanding balance of your loan. In the early years of a standard amortization schedule, the principal portion is small, but it grows over time as the interest portion decreases.
2. Interest
Interest is the cost of borrowing money from your lender. It is calculated based on your annual interest rate and the remaining loan balance. Higher interest rates significantly increase your monthly payment and the total cost of the home over the life of the loan.
3. Taxes
Property taxes are assessed by your local government to fund public services like schools, roads, and emergency services. Most lenders collect a portion of this annual cost every month and hold it in an escrow account to pay the bill when it comes due.
4. Insurance
Homeowners insurance protects your property against damage from fires, storms, and other hazards. Like property taxes, the annual premium is usually divided by 12 and added to your monthly mortgage payment.
How Interest Rates Affect Affordability
Even a small fluctuation in interest rates can have a dramatic impact on your purchasing power. For example, on a $400,000 loan, the difference between a 6% and a 7% interest rate can change your monthly payment by hundreds of dollars, potentially costing tens of thousands more in interest over a 30-year term.
Tips for Lowering Your Monthly Payment
Increase your Down Payment: Putting more money down reduces the loan principal and can eliminate the need for Private Mortgage Insurance (PMI).
Improve Your Credit Score: A higher credit score often qualifies you for lower interest rates.
Shop for Insurance: Homeowners insurance rates vary. Comparing quotes can save you money on your monthly escrow payments.
Consider a Shorter Term: While 15-year loans have higher monthly payments, they usually offer lower interest rates and significantly lower total interest costs.
Frequently Asked Questions
Does this calculator include PMI?
This calculator focuses on PITI. If your down payment is less than 20% of the home price, lenders usually require Private Mortgage Insurance (PMI), which would be an additional monthly cost not calculated here.
What is an escrow account?
An escrow account is a neutral account set up by your lender to pay your property taxes and homeowners insurance. Your monthly payment includes these costs, and the lender pays the bills on your behalf when they are due.
function calculateMortgage() {
// 1. Get Input Values
var price = parseFloat(document.getElementById('homePrice').value);
var down = parseFloat(document.getElementById('downPayment').value);
var rate = parseFloat(document.getElementById('interestRate').value);
var years = parseInt(document.getElementById('loanTerm').value);
var annualTax = parseFloat(document.getElementById('propertyTax').value);
var annualIns = parseFloat(document.getElementById('homeInsurance').value);
// 2. Validate Inputs
if (isNaN(price) || isNaN(down) || isNaN(rate) || isNaN(years)) {
alert("Please enter valid numbers for Price, Down Payment, Rate, and Term.");
return;
}
if (down >= price) {
alert("Down payment cannot be equal to or greater than the Home Price.");
return;
}
// 3. Perform Calculations
var loanAmount = price – down;
var monthlyRate = rate / 100 / 12;
var totalPayments = years * 12;
// Monthly Principal & Interest (PI)
var monthlyPI = 0;
if (rate === 0) {
monthlyPI = loanAmount / totalPayments;
} else {
// M = P [ i(1 + i)^n ] / [ (1 + i)^n – 1 ]
monthlyPI = loanAmount * (monthlyRate * Math.pow(1 + monthlyRate, totalPayments)) / (Math.pow(1 + monthlyRate, totalPayments) – 1);
}
// Monthly Taxes and Insurance
var monthlyTax = 0;
if (!isNaN(annualTax)) {
monthlyTax = annualTax / 12;
}
var monthlyIns = 0;
if (!isNaN(annualIns)) {
monthlyIns = annualIns / 12;
}
var totalMonthly = monthlyPI + monthlyTax + monthlyIns;
// 4. Update UI
// Helper function for currency formatting
var formatter = new Intl.NumberFormat('en-US', {
style: 'currency',
currency: 'USD',
minimumFractionDigits: 2
});
document.getElementById('totalMonthlyDisplay').innerText = formatter.format(totalMonthly);
document.getElementById('piDisplay').innerText = formatter.format(monthlyPI);
document.getElementById('taxDisplay').innerText = formatter.format(monthlyTax);
document.getElementById('insDisplay').innerText = formatter.format(monthlyIns);
document.getElementById('loanAmountDisplay').innerText = formatter.format(loanAmount);
// Show result section
document.getElementById('resultSection').style.display = 'block';
}