Mortgage Calculator: Estimate Your Monthly Mortgage Payment

A mortgage calculator gives you a solid budgeting estimate, but it's only as accurate as what you put in, and most calculators leave things out. The basic ones show principal and interest but skip property taxes, homeowners insurance, mortgage insurance, and HOA dues, which together can add hundreds of dollars to your real monthly payment.

In Philadelphia, property taxes especially can swing the number. Use a calculator to get in the ballpark, then confirm the real figure with a lender pre-approval before you make an offer.

PITI stands for the four parts of your monthly mortgage payment: Principal, Interest, Taxes, and Insurance. Principal pays down your loan balance, interest is the cost of borrowing, taxes are your property taxes (collected monthly into an escrow account), and insurance is your homeowners policy (plus mortgage insurance if you put less than 20% down).

In Philadelphia, the "T" carries real weight because city property taxes are a meaningful slice of the payment, so a true PITI estimate matters more here than a principal-and-interest-only number.

A common starting guideline is to keep your total monthly housing payment (PITI) around 28% of your gross monthly income and your total debt under roughly 43%, though some loan programs allow higher. At about $7,000 a month in income, that points to a comfortable payment near $1,960.

Keep in mind that Philadelphia's property taxes and any mortgage insurance get baked into that payment, so the home price you can actually afford is usually lower than a quick "price" calculator suggests. The most accurate answer comes from a lender pre-approval, which prices in your real rate, taxes, and debts. I can connect you with local lenders to run your exact numbers.

Your rate depends on your credit score, down payment, loan type, loan term, and the day's market. As of mid-2026, 30-year fixed rates have been hovering in the mid-6% range, but they move daily, so treat any quoted number as a snapshot.

The biggest levers you control are your credit score (higher scores earn lower rates) and your down payment. The only way to know your actual rate is to apply with a lender, and it pays to compare a few, since rates and fees vary from one to the next.

Your interest rate is the cost of borrowing the loan principal. Your APR (annual percentage rate) is the broader yearly cost that also folds in most lender fees, points, and mortgage insurance. APR is almost always higher than the rate, and it's the better number for comparing loan offers side by side, because one lender's lower rate can hide higher fees.

A mortgage calculator typically uses the interest rate to figure your monthly payment, while APR tells you the true long-run cost. When you shop lenders, compare both.

There's no single right answer, but the key threshold is 20%: put down 20% or more on a conventional loan and you avoid private mortgage insurance (PMI). Put down less and you'll pay PMI until you build enough equity, though smaller down payments (often 3% to 3.5%) get you into a home sooner and free up cash for reserves and repairs.

In Philadelphia, first-time buyers can also use assistance programs like Philly First Home and PHFA to cover part of the down payment (see our Buyer's Guide for details). The right call balances avoiding PMI against keeping cash on hand.

PMI (private mortgage insurance) is an extra monthly cost on conventional loans when you put down less than 20%, and it protects the lender, not you. The good news is that it's temporary: you can request cancellation once you reach 20% equity (80% loan-to-value), and your lender must automatically remove it at 22% equity (78% loan-to-value).

FHA loans work differently. Their mortgage insurance (MIP) usually lasts the life of the loan if you put down less than 10%, and the common way to remove it is to refinance into a conventional loan once you've built enough equity. That difference is worth weighing when you choose a loan type.

A 30-year mortgage spreads payments over a longer term, so your monthly payment is lower, but you pay much more interest overall. A 15-year mortgage has a higher monthly payment but a lower interest rate and far less total interest, and it builds equity faster. As of mid-2026, 15-year rates have run roughly half a percentage point below 30-year rates.

In a calculator, try toggling the term to compare. Many buyers choose a 30-year loan for payment flexibility and simply pay extra toward principal when they can, capturing some of the 15-year benefit without locking into the higher required payment.

Property taxes are usually collected monthly inside your mortgage payment (the "T" in PITI) and held in escrow, so they directly raise your monthly number. Philadelphia's rate is 1.3998% of your home's assessed value, which on a $300,000 assessment is about $4,200 a year, or roughly $350 a month added to your payment.

Two things can lower it: the Homestead Exemption reduces your taxable assessed value by $100,000 for owner-occupied homes, and a home with an active 10-year tax abatement is taxed only on reduced value during the abatement period. Many calculators plug in a generic tax estimate, so for an accurate Philadelphia payment, enter the real figures.