Mortgage Calculator

How to Use This Mortgage Calculator

This mortgage calculator helps you estimate your monthly housing payment and understand the true cost of buying a home. Follow these three simple steps to get an accurate estimate of your mortgage costs.

Step 1: Enter the home price and your down payment. Type in the purchase price of the home you are considering. Then enter your down payment as either a dollar amount or a percentage of the home price. A larger down payment reduces your loan amount and may eliminate the need for private mortgage insurance.

Step 2: Set your interest rate and loan term. Enter the annual interest rate offered by your lender. Then select a loan term from the available options: 10, 15, 20, 25, or 30 years. Shorter terms have higher monthly payments but lower total interest costs over the life of the loan.

Step 3: Add additional costs in the Advanced section. Expand the Advanced options to include property tax, homeowner's insurance, HOA fees, and PMI rate. These additional costs are factored into your total monthly payment, giving you a realistic picture of your housing expenses.

How Mortgage Payments Are Calculated

The core mortgage formula is M = P × [r(1+r)ⁿ] / [(1+r)ⁿ - 1], where M is the monthly payment, P is the loan principal (home price minus down payment), r is the monthly interest rate (annual rate divided by 12), and n is the total number of monthly payments (loan term in years multiplied by 12).

This formula calculates only the principal and interest portion of your payment. Your total monthly payment also includes property taxes (usually divided into 12 monthly installments), homeowner's insurance premiums, and potentially HOA fees and PMI. Together, these components make up what lenders call your PITI payment, which is used to determine how much home you can afford.

An amortization schedule shows how each monthly payment is split between principal and interest over the life of the loan. In the early years, most of your payment goes toward interest. As the loan matures, a larger portion goes toward reducing the principal balance. This calculator generates a complete year-by-year amortization schedule so you can see how your equity builds over time.

Tips for Getting the Best Mortgage Deal

1. Improve your credit score before applying. A higher credit score qualifies you for lower interest rates. Even a 0.5% rate reduction can save tens of thousands of dollars over the life of a 30-year mortgage. Pay down existing debt and avoid new credit inquiries before applying.
2. Compare offers from multiple lenders. Mortgage rates and fees vary significantly between lenders. Get quotes from at least three different lenders, including banks, credit unions, and online lenders. Compare the APR, which includes both the interest rate and lender fees.
3. Consider making a 20% down payment. Putting 20% down eliminates the need for PMI, which can cost $100 to $300 or more per month. If you cannot reach 20%, explore options like FHA loans or lender-paid PMI to keep costs manageable.
4. Factor in all homeownership costs. Your mortgage payment is only part of the cost of owning a home. Budget for property taxes, insurance, maintenance (typically 1% of home value per year), utilities, and potential HOA fees when determining how much home you can afford.
5. Consider paying points to lower your rate. Discount points allow you to prepay interest upfront in exchange for a lower rate. Each point costs 1% of the loan amount and typically reduces the rate by 0.25%. This makes sense if you plan to stay in the home long enough to break even on the upfront cost.