Your total monthly mortgage payment is usually more than just principal and interest — lenders typically bundle in property tax, homeowners insurance, and, if your down payment is under 20%, private mortgage insurance (PMI). This calculator adds all four together so the number you see is closer to what you'd actually pay each month, rather than the artificially low principal-and-interest-only figure many basic calculators show. Adjust the loan term or down payment to see how they shift your monthly cost and total interest paid over the life of the loan.