Month Interest Rate Calculator

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Mortgage Payment Calculator

Estimate your monthly payments, including taxes and insurance.

30 Years 20 Years 15 Years 10 Years
Estimated Monthly Payment $0.00
Principal & Interest: $0.00
Property Tax (Monthly): $0.00
Home Insurance (Monthly): $0.00
HOA Fees (Monthly): $0.00
Loan Amount: $0.00
Total Interest Paid (Over Term): $0.00

How to Use This Mortgage Calculator

Purchasing a home is one of the biggest financial decisions you will make. Our Mortgage Payment Calculator is designed to give you a comprehensive view of your potential monthly housing costs. By inputting specific details about the loan and the property, you can calculate not just the mortgage principal and interest, but also the "hidden" costs like taxes, insurance, and HOA fees.

Understanding the Inputs

  • Home Price: The total purchase price of the real estate property.
  • Down Payment: The upfront cash you pay toward the home purchase. A larger down payment reduces your loan amount and monthly payments.
  • Loan Term: The duration of the mortgage. A 30-year term usually has lower monthly payments but higher total interest costs compared to a 15-year term.
  • Interest Rate: The annual cost of borrowing money, expressed as a percentage. This rate significantly impacts your monthly payment.
  • Property Tax & Insurance: These are often bundled into your monthly payment via an escrow account. Our calculator breaks these down to show the true cost of ownership.

How Mortgage Payments Are Calculated

The core of your monthly payment is the "Principal and Interest" (P&I). This is calculated using the standard amortization formula:

M = P [ i(1 + i)^n ] / [ (1 + i)^n – 1 ]

  • M = Total monthly P&I payment
  • P = Principal loan amount (Home Price – Down Payment)
  • i = Monthly interest rate (Annual Rate / 12)
  • n = Number of payments (Loan Term in Years × 12)

PITI: The Full Picture

Most borrowers focus on P&I, but lenders look at PITI: Principal, Interest, Taxes, and Insurance. If you are buying a condo or a property in a managed community, you must also factor in Homeowners Association (HOA) fees. While HOA fees are rarely paid to the lender, they are a mandatory monthly obligation that affects your debt-to-income ratio.

Strategies to Lower Your Monthly Payment

If the calculated payment is higher than your budget allows, consider the following strategies:

  1. Increase your down payment: Putting 20% down avoids Private Mortgage Insurance (PMI) and lowers the principal.
  2. Improve your credit score: Higher credit scores often qualify for lower interest rates.
  3. Shop for insurance: Homeowners insurance rates vary; shopping around can save you hundreds per year.
  4. Consider a longer term: While it costs more in interest over time, a 30-year loan has lower monthly payments than a 15-year loan.
function calculateMortgage() { // Get Input Values var price = parseFloat(document.getElementById('mcHomePrice').value); var down = parseFloat(document.getElementById('mcDownPayment').value); var years = parseFloat(document.getElementById('mcLoanTerm').value); var rate = parseFloat(document.getElementById('mcInterestRate').value); var yearlyTax = parseFloat(document.getElementById('mcPropertyTax').value); var yearlyInsurance = parseFloat(document.getElementById('mcHomeInsurance').value); var monthlyHOA = parseFloat(document.getElementById('mcHoaFees').value); // Validation if (isNaN(price) || isNaN(down) || isNaN(years) || isNaN(rate)) { alert("Please ensure Home Price, Down Payment, Term, and Interest Rate are valid numbers."); return; } // Handle empty optional fields if (isNaN(yearlyTax)) yearlyTax = 0; if (isNaN(yearlyInsurance)) yearlyInsurance = 0; if (isNaN(monthlyHOA)) monthlyHOA = 0; // Core Calculations var principal = price – down; var monthlyInterestRate = (rate / 100) / 12; var numberOfPayments = years * 12; // Prevent negative principal if (principal <= 0) { alert("Down payment cannot be greater than or equal to Home Price."); return; } // Calculate Principal & Interest (P&I) var monthlyPI = 0; if (rate === 0) { monthlyPI = principal / numberOfPayments; } else { // Formula: M = P [ i(1 + i)^n ] / [ (1 + i)^n – 1 ] var x = Math.pow(1 + monthlyInterestRate, numberOfPayments); monthlyPI = (principal * x * monthlyInterestRate) / (x – 1); } // Calculate Escrow items (Tax + Insurance) var monthlyTax = yearlyTax / 12; var monthlyInsurance = yearlyInsurance / 12; // Total Monthly Payment var totalMonthlyPayment = monthlyPI + monthlyTax + monthlyInsurance + monthlyHOA; // Total Stats var totalInterest = (monthlyPI * numberOfPayments) – principal; // Update UI document.getElementById('mcResults').style.display = 'block'; // Formatting function var fmt = new Intl.NumberFormat('en-US', { style: 'currency', currency: 'USD' }); document.getElementById('mcTotalMonthly').innerText = fmt.format(totalMonthlyPayment); document.getElementById('mcPrincipalInterest').innerText = fmt.format(monthlyPI); document.getElementById('mcMonthlyTax').innerText = fmt.format(monthlyTax); document.getElementById('mcMonthlyInsurance').innerText = fmt.format(monthlyInsurance); document.getElementById('mcMonthlyHOA').innerText = fmt.format(monthlyHOA); document.getElementById('mcLoanAmount').innerText = fmt.format(principal); document.getElementById('mcTotalInterest').innerText = fmt.format(totalInterest); }

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