How to Calculate Annual Percentage Rate on Car Loan

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Mortgage Payment Calculator

Estimate your monthly mortgage payments with taxes, insurance, and PMI included. Use this tool to plan your home purchase budget effectively by adjusting home price, down payment, and interest rates.

30 Years 20 Years 15 Years 10 Years
Please enter valid positive numbers for all fields.
Principal & Interest: $0.00
Property Tax: $0.00
Home Insurance: $0.00
Total Monthly Payment: $0.00

Understanding Your Mortgage Payment

When you take out a mortgage loan to buy a house, your monthly payment is typically composed of four main parts, often referred to as PITI: Principal, Interest, Taxes, and Insurance. Understanding how these components interact is crucial for determining how much home you can afford.

1. Principal

The principal is the money you borrowed. Part of every monthly payment goes toward paying back this balance. In the early years of a mortgage, the percentage of your payment that goes toward principal is small, but it increases over time as the interest portion decreases.

2. Interest

Interest is the cost of borrowing money. This is paid to the lender as a fee. Higher interest rates significantly increase your monthly payment and the total cost of the loan over time. Our calculator uses the standard amortization formula to determine exactly how much interest you pay based on your rate and loan term.

3. Property Taxes

Property taxes are assessed by your local government to fund public services like schools, police, and road maintenance. Lenders typically collect this money as part of your monthly payment and hold it in an escrow account to pay the tax bill when it's due. The calculator estimates the monthly portion by dividing your annual tax bill by 12.

4. Homeowners Insurance

Lenders require you to carry homeowners insurance to protect the property against damage from fire, storms, and other hazards. Like property taxes, this is usually collected monthly and held in escrow.

How Interest Rates Affect Affordability

Even a small change in interest rates can have a massive impact on your purchasing power. For example, on a $300,000 loan, the difference between a 6% and a 7% interest rate can increase your monthly payment by nearly $200 and cost you tens of thousands of dollars over the life of the loan. It is always recommended to shop around with multiple lenders to secure the best rate possible.

Calculated Breakdown

This tool calculates the fully amortized monthly payment. This means that if you make every payment on time for the duration of the loan term (e.g., 30 years), the loan will be completely paid off. The formula used accounts for compounding interest monthly, ensuring accuracy for standard U.S. fixed-rate mortgages.

function calculateMortgage() { // 1. Get DOM elements var homePriceInput = document.getElementById('homePrice'); var downPaymentInput = document.getElementById('downPayment'); var interestRateInput = document.getElementById('interestRate'); var loanTermInput = document.getElementById('loanTerm'); var propertyTaxInput = document.getElementById('propertyTax'); var homeInsuranceInput = document.getElementById('homeInsurance'); var errorDiv = document.getElementById('mpcError'); var resultsDiv = document.getElementById('mpcResults'); var resPI = document.getElementById('resPI'); var resTax = document.getElementById('resTax'); var resIns = document.getElementById('resIns'); var resTotal = document.getElementById('resTotal'); // 2. Parse values var homePrice = parseFloat(homePriceInput.value); var downPayment = parseFloat(downPaymentInput.value); var interestRate = parseFloat(interestRateInput.value); var loanTerm = parseInt(loanTermInput.value); var propertyTax = parseFloat(propertyTaxInput.value); var homeInsurance = parseFloat(homeInsuranceInput.value); // 3. Validation if (isNaN(homePrice) || isNaN(downPayment) || isNaN(interestRate) || isNaN(loanTerm) || isNaN(propertyTax) || isNaN(homeInsurance) || homePrice < 0 || downPayment < 0 || interestRate < 0) { errorDiv.style.display = 'block'; resultsDiv.style.display = 'none'; return; } errorDiv.style.display = 'none'; // 4. Calculation Logic // Loan Amount var principal = homePrice – downPayment; // If down payment is greater than home price, principal is 0 if (principal < 0) principal = 0; // Monthly Interest Rate var monthlyRate = (interestRate / 100) / 12; // Total Number of Payments var numberOfPayments = loanTerm * 12; // Calculate Principal & Interest (P&I) var monthlyPI = 0; if (interestRate === 0) { monthlyPI = principal / numberOfPayments; } else { // Formula: M = P [ i(1 + i)^n ] / [ (1 + i)^n – 1 ] var x = Math.pow(1 + monthlyRate, numberOfPayments); monthlyPI = principal * ((monthlyRate * x) / (x – 1)); } // Calculate Monthly Tax and Insurance var monthlyTax = propertyTax / 12; var monthlyInsurance = homeInsurance / 12; // Total Monthly Payment var totalMonthly = monthlyPI + monthlyTax + monthlyInsurance; // 5. Formatting Output var formatter = new Intl.NumberFormat('en-US', { style: 'currency', currency: 'USD', minimumFractionDigits: 2 }); resPI.innerHTML = formatter.format(monthlyPI); resTax.innerHTML = formatter.format(monthlyTax); resIns.innerHTML = formatter.format(monthlyInsurance); resTotal.innerHTML = formatter.format(totalMonthly); // 6. Show Results resultsDiv.style.display = 'block'; }

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