Estimate your monthly house payments with taxes and insurance.
Principal & Interest:$0.00
Monthly Property Tax:$0.00
Monthly Home Insurance:$0.00
Total Monthly Payment:$0.00
Total Loan Amount: $0.00
function calculateMortgage() {
// Get input values
var homePrice = parseFloat(document.getElementById("homePrice").value);
var downPayment = parseFloat(document.getElementById("downPayment").value);
var interestRate = parseFloat(document.getElementById("interestRate").value);
var loanTerm = parseFloat(document.getElementById("loanTerm").value);
var propertyTax = parseFloat(document.getElementById("propertyTax").value);
var homeInsurance = parseFloat(document.getElementById("homeInsurance").value);
// Validation
if (isNaN(homePrice) || isNaN(downPayment) || isNaN(interestRate) || isNaN(loanTerm)) {
alert("Please enter valid numbers for the loan details.");
return;
}
if (isNaN(propertyTax)) propertyTax = 0;
if (isNaN(homeInsurance)) homeInsurance = 0;
// Calculations
var principal = homePrice – downPayment;
var monthlyRate = (interestRate / 100) / 12;
var numberOfPayments = loanTerm * 12;
// Handle edge case of 0% interest
var monthlyPI = 0;
if (interestRate === 0) {
monthlyPI = principal / numberOfPayments;
} else {
// Mortgage Formula: M = P [ i(1 + i)^n ] / [ (1 + i)^n – 1 ]
monthlyPI = principal * (monthlyRate * Math.pow(1 + monthlyRate, numberOfPayments)) / (Math.pow(1 + monthlyRate, numberOfPayments) – 1);
}
var monthlyTax = propertyTax / 12;
var monthlyIns = homeInsurance / 12;
var totalMonthly = monthlyPI + monthlyTax + monthlyIns;
// Display Results
document.getElementById("resultsArea").style.display = "block";
// Format to currency
document.getElementById("valPI").innerText = "$" + monthlyPI.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById("valTax").innerText = "$" + monthlyTax.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById("valIns").innerText = "$" + monthlyIns.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById("valTotal").innerText = "$" + totalMonthly.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById("valLoanAmount").innerText = "$" + principal.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2});
}
How to Calculate Your Mortgage Payment
Understanding your monthly mortgage obligation is the first step in the home buying process. This Mortgage Payment Calculator helps you estimate your total monthly costs, known in the industry as PITI (Principal, Interest, Taxes, and Insurance).
Components of a Mortgage Payment
Your monthly payment is typically composed of four main parts:
Principal: The portion of your payment that reduces the loan balance. In the early years of a 30-year mortgage, this amount is small but grows over time.
Interest: The cost of borrowing money. This is calculated based on your remaining loan balance and your annual interest rate.
Property Taxes: Taxes charged by your local government, usually based on the assessed value of your home. These are often collected by the lender and held in an escrow account.
Homeowners Insurance: Protection against hazards like fire or theft. Like taxes, this annual premium is often divided by 12 and added to your monthly bill.
How Interest Rates Affect Your Buying Power
Even a small change in interest rates can significantly impact your monthly payment and total purchasing power. For example, on a $300,000 loan, a 1% increase in interest rate can raise your monthly payment by over $150. It is crucial to shop around for the best rate and maintain a good credit score to qualify for lower rates.
Tips for Lowering Your Monthly Payment
If the estimated payment is higher than your budget allows, consider these strategies:
Increase your down payment: This lowers the principal loan amount and may remove the need for Private Mortgage Insurance (PMI).
Extend the loan term: Opting for a 30-year term instead of 15 years will lower monthly payments, though you will pay more interest over the life of the loan.
Shop for cheaper insurance: Compare quotes from different insurance providers to reduce your annual premium.