Nominal Interest Rate and Inflation Calculator

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Advanced Mortgage Payment Calculator

Estimate your monthly mortgage payments including principal, interest, taxes, and insurance (PITI).

Typically 20% to avoid PMI
30 Years 20 Years 15 Years 10 Years
Approx 1.1% of home value on average
Only applies if down payment < 20%
Please enter valid positive numbers for all required fields.
Principal & Interest: $0.00
Property Taxes: $0.00
Homeowners Insurance: $0.00
PMI (Private Mortgage Insurance): $0.00
Total Monthly Payment: $0.00

Understanding Your Mortgage Payment Breakdown

When you take out a mortgage to buy a home, your monthly payment is often composed of four main parts, commonly referred to as PITI: Principal, Interest, Taxes, and Insurance.

Principal & Interest: The principal is the money you borrowed to buy the house, while interest is the cost of borrowing that money. In a standard amortization schedule, your early payments go primarily toward interest, while later payments pay down more principal.

Why Include Taxes and Insurance?

Many lenders require an escrow account where they collect funds for property taxes and homeowners insurance along with your mortgage payment. This ensures these critical bills are paid on time. Our calculator includes fields for annual property tax and insurance to give you a realistic view of your total monthly housing obligation.

What is PMI?

Private Mortgage Insurance (PMI) is usually required if your down payment is less than 20% of the home's purchase price. It protects the lender if you default on the loan. This calculator automatically checks if your down payment is under 20% and applies the estimated PMI rate to your monthly costs.

How Interest Rates Affect Affordability

Even a small change in interest rates can significantly impact your monthly payment. For example, on a $300,000 loan, the difference between a 6% and a 7% interest rate can add roughly $200 to your monthly payment. Use the input fields above to test different rate scenarios to see what fits your budget.

function calculateMortgage() { // 1. Get Inputs var homePrice = parseFloat(document.getElementById('mcHomePrice').value); var downPayment = parseFloat(document.getElementById('mcDownPayment').value); var termYears = parseFloat(document.getElementById('mcLoanTerm').value); var annualRate = parseFloat(document.getElementById('mcInterestRate').value); var annualTax = parseFloat(document.getElementById('mcPropertyTax').value); var annualInsurance = parseFloat(document.getElementById('mcHomeInsurance').value); var pmiRate = parseFloat(document.getElementById('mcPMI').value); // 2. Validation var errorMsg = document.getElementById('mcErrorMsg'); var resultsDiv = document.getElementById('mcResults'); if (isNaN(homePrice) || isNaN(downPayment) || isNaN(annualRate) || homePrice = home price if (loanAmount 0 && monthlyRate > 0) { // Formula: M = P [ i(1 + i)^n ] / [ (1 + i)^n – 1 ] var x = Math.pow(1 + monthlyRate, numberOfPayments); monthlyPI = loanAmount * ((monthlyRate * x) / (x – 1)); } else if (loanAmount > 0 && monthlyRate === 0) { monthlyPI = loanAmount / numberOfPayments; } // Calculate Monthly Tax and Insurance var monthlyTax = annualTax / 12; var monthlyInsurance = annualInsurance / 12; // Calculate PMI // PMI usually applies if Loan-to-Value > 80% (Down payment < 20%) var monthlyPMI = 0; var downPaymentPercent = (downPayment / homePrice) * 100; if (downPaymentPercent 0) { // PMI is typically calculated on the total loan amount monthlyPMI = (loanAmount * (pmiRate / 100)) / 12; } // Total var totalMonthly = monthlyPI + monthlyTax + monthlyInsurance + monthlyPMI; // 4. Update UI with formatted currency document.getElementById('resPrincipalInterest').innerText = formatCurrency(monthlyPI); document.getElementById('resTax').innerText = formatCurrency(monthlyTax); document.getElementById('resInsurance').innerText = formatCurrency(monthlyInsurance); document.getElementById('resPMI').innerText = formatCurrency(monthlyPMI); document.getElementById('resTotal').innerText = formatCurrency(totalMonthly); resultsDiv.style.display = 'block'; } function formatCurrency(num) { return '$' + num.toFixed(2).replace(/\d(?=(\d{3})+\.)/g, '$&,'); }

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