Mortgage Payment Calculator with Taxes & Insurance
30 Years
20 Years
15 Years
10 Years
Estimated Monthly Payment
$0.00
Principal & Interest:$0.00
Property Tax:$0.00
Home Insurance:$0.00
Total Loan Amount:$0.00
Total Interest Paid:$0.00
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 loanTermYears = parseFloat(document.getElementById('loanTerm').value);
var propertyTax = parseFloat(document.getElementById('propertyTax').value);
var homeInsurance = parseFloat(document.getElementById('homeInsurance').value);
// Validation
if (isNaN(homePrice) || isNaN(downPayment) || isNaN(interestRate) || isNaN(loanTermYears) || isNaN(propertyTax) || isNaN(homeInsurance)) {
alert("Please enter valid numbers for all fields.");
return;
}
if (downPayment >= homePrice) {
alert("Down payment cannot be greater than or equal to the home price.");
return;
}
// Calculations
var principal = homePrice – downPayment;
var monthlyInterestRate = (interestRate / 100) / 12;
var numberOfPayments = loanTermYears * 12;
// Principal & Interest Calculation
var monthlyPI = 0;
if (interestRate === 0) {
monthlyPI = principal / numberOfPayments;
} else {
monthlyPI = principal * (monthlyInterestRate * Math.pow(1 + monthlyInterestRate, numberOfPayments)) / (Math.pow(1 + monthlyInterestRate, numberOfPayments) – 1);
}
var monthlyTax = propertyTax / 12;
var monthlyInsurance = homeInsurance / 12;
var totalMonthly = monthlyPI + monthlyTax + monthlyInsurance;
var totalPaymentOverLife = monthlyPI * numberOfPayments;
var totalInterest = totalPaymentOverLife – principal;
// Formatting currency
var formatter = new Intl.NumberFormat('en-US', {
style: 'currency',
currency: 'USD',
});
// Update DOM
document.getElementById('totalMonthlyPayment').innerText = formatter.format(totalMonthly);
document.getElementById('piAmount').innerText = formatter.format(monthlyPI);
document.getElementById('taxAmount').innerText = formatter.format(monthlyTax);
document.getElementById('insAmount').innerText = formatter.format(monthlyInsurance);
document.getElementById('loanAmountResult').innerText = formatter.format(principal);
document.getElementById('totalInterestResult').innerText = formatter.format(totalInterest);
}
// Run calculation once on load to populate default values
window.onload = function() {
calculateMortgage();
};
Understanding Your Mortgage Payments
Buying a home is one of the most significant financial decisions you will make. While the listing price of a home gives you a starting point, it doesn't tell the whole story of your monthly financial commitment. Our Mortgage Payment Calculator helps you break down the actual costs associated with your home loan, ensuring you aren't caught off guard by hidden expenses.
What is Included in Your Monthly Mortgage Payment?
A typical monthly mortgage payment consists of four main components, often referred to by the acronym PITI:
Principal (P): The portion of your payment that goes toward paying down the amount you borrowed. In the early years of a loan, this amount is small, but it grows over time as you pay down the balance.
Interest (I): The cost of borrowing money from your lender. This usually makes up the bulk of your payment in the early years of a 30-year mortgage.
Taxes (T): Property taxes charged by your local government. These are often collected by the lender in an escrow account and paid on your behalf annually.
Insurance (I): Homeowners insurance protects your property against damage. Like taxes, this is often bundled into your monthly payment via escrow.
How Interest Rates Affect Your Buying Power
Even a small change in interest rates can significantly impact your monthly payment and the total cost of the loan. For example, on a $300,000 loan, a difference of just 1% in the interest rate can change your monthly payment by hundreds of dollars and your total interest paid by tens of thousands over 30 years.
When using this calculator, try adjusting the Interest Rate field to see how sensitive your monthly budget is to rate fluctuations. This can help you decide when to lock in a rate or whether to purchase "points" to lower your rate.
The Impact of the Loan Term
Most homebuyers choose a 30-year fixed-rate mortgage because it offers the lowest monthly payment. However, selecting a 15-year term will drastically reduce the total interest you pay over the life of the loan, although your monthly payments will be higher. Use the "Loan Term" dropdown in the calculator to compare these scenarios and find the balance that fits your financial goals.
Pro Tip: Don't forget to budget for maintenance! While not included in this calculator, experts recommend setting aside 1% of your home's value annually for repairs and upkeep.