Mortgage Calculator
Estimate monthly principal and interest for a mortgage.
How Mortgages Work: An Overview of Home Financing
A mortgage is a specialized loan used to purchase or maintain a home, land, or other types of real estate. The buyer agrees to pay the lender over time, typically in a series of regular monthly payments that are divided into principal and interest. The property itself serves as collateral to secure the loan. If a homebuyer defaults on their payments, the lender can evict the tenant and sell the home through a legal process known as foreclosure. Because home purchases represent substantial sums of money, mortgages are designed with extended repayment terms—most commonly 15 or 30 years—to keep the monthly payments manageable for ordinary consumers.
When reviewing your estimated monthly housing expenses, it is critical to distinguish between Principal and Interest (P&I) and your total monthly housing payment. The P&I represents the baseline cost of borrowing the money and slowly paying back the initial balance. Your total monthly payment, however, usually includes several additional costs pooled into an escrow account. These extra costs consist of local property taxes, homeowners insurance premiums, and, if applicable, homeowners association (HOA) fees. Together, these elements are often referred to by the acronym PITI (Principal, Interest, Taxes, and Insurance), and they can add hundreds of dollars to your monthly out-of-pocket expenses.
Several primary factors dictate the interest rates available on home loans. First and foremost is your personal credit profile; borrowers with excellent credit scores receive significantly lower rates because they represent a lower risk of default. Second, the macroeconomic environment, Federal Reserve policies, and bond market yields heavily influence baseline mortgage rates nationwide. Finally, the size of your down payment and your chosen loan term affect your rate. For instance, a 15-year fixed mortgage usually offers a lower interest rate than a 30-year fixed mortgage, though the shorter timeline results in a higher monthly payment because you are paying off the principal balance twice as fast.
If you purchase a home with a conventional mortgage and put down less than 20% of the home's purchase price, your lender will generally require you to pay Private Mortgage Insurance (PMI). PMI is an extra monthly fee that protects the lender—not you—in case you default on the loan. PMI costs typically range from 0.5% to 1.5% of the total loan amount annually and are added directly to your monthly payment. Fortunately, under federal law, you can request to cancel your PMI once your outstanding loan balance depreciates to 80% of the home's original value, or it will automatically terminate when the balance reaches 78%.
Please keep in mind that this calculator is designed to provide quick educational estimates of your baseline Principal and Interest (P&I) payments. It does not account for local tax rates, individual insurance premiums, loan origination fees, closing costs, or PMI. Because real-world mortgage terms and underwriting guidelines vary significantly from lender to lender, you should always treat these numbers as helpful planning estimates. Before making any binding financial commitments or bidding on real estate, verify all rates, terms, and eligibility guidelines with a licensed mortgage broker or lending professional.
How to use this calculator
Enter realistic assumptions, run the estimate, then test a higher and lower scenario. Small changes to rates, time, and payments can change the result significantly.