Mortgage Payment Calculator

How it works

A mortgage payment has four parts, often called PITI: principal, interest, taxes, and insurance. The principal and interest are fixed by your loan amount, rate, and term through the standard amortized payment formula, while taxes and insurance are added on top and can drift over time:

• L — the loan amount (home price minus down payment)
• i — the monthly interest rate (APR ÷ 12)
• n — the number of monthly payments (years × 12)

With the defaults above, a $400,000 home with $80,000 down is a $320,000 loan. At 7% over 30 years, principal and interest come to about $2,129 a month, and adding property tax and insurance brings the true payment to roughly $2,654. Over the full term you would pay around $446,000 in interest alone, which is why the rate and term matter so much.

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What moves the payment most

Four numbers decide your payment, and they do not pull equally. Understanding which lever matters most helps you focus your energy where it actually changes the figure rather than sweating the details that barely move it.

• The term. A 15-year loan carries a much higher monthly payment than a 30-year, but a fraction of the lifetime interest. If the monthly fits, it is the cheapest way to own. The 30-year keeps the payment low and leaves room in the budget, which is why it remains the default choice for most buyers.
• The rate. Even half a percent changes the payment and adds tens of thousands over 30 years. Rates move with the wider economy and with your own credit score, so shopping several lenders and improving your credit before you apply are both worth the effort.
• The down payment. More down means a smaller loan and, past 20%, no private mortgage insurance. It is the one lever fully in your control at the start, and the difference between 10% and 20% down can be worth hundreds a month once PMI is removed from the equation.
• The price. The most obvious lever and the easiest to overlook. A cheaper home shrinks every other number at once, and buying below what a lender approves you for is the simplest way to keep the payment comfortable.

What the payment does and does not cover

The PITI figure here, principal, interest, taxes, and insurance, is the amount most lenders collect each month, usually bundling the tax and insurance portions into an escrow account and paying those bills on your behalf. But it is not the whole cost of living in the home. A few common costs sit outside it:

• HOA or condo fees. If your home is in an association, monthly dues are a separate bill that can run from modest to several hundred dollars, and they are not part of the mortgage payment.
• Private mortgage insurance. With less than 20% down, PMI is added until you build enough equity. It protects the lender, not you, and it is worth removing as soon as you qualify.
• Maintenance and repairs. A common rule of thumb sets aside about 1% of the home's value a year for upkeep. It is invisible until the roof or the water heater fails, so budgeting for it in advance keeps a surprise from becoming a crisis.

Adding these to the PITI figure gives the true monthly cost of ownership, which is often 10 to 20% above the mortgage payment alone.

Paying the mortgage down faster

Because interest is charged on the outstanding balance, anything extra you pay goes straight to principal and erases all the future interest that balance would have earned. Three approaches stand out:

• A little extra each month. Even $100 or $200 added to the payment can shave years off a 30-year loan and save tens of thousands in interest. It is the simplest and most flexible method.
• Biweekly payments. Paying half the monthly amount every two weeks results in 13 full payments a year instead of 12, quietly accelerating the payoff without a large budget change.
• A lump sum or recast. Applying a windfall to the balance, or asking the lender to recast the loan after a large payment, lowers either the term or the monthly payment while keeping the same rate.

Before paying extra, confirm the money is applied to principal and that your loan has no prepayment penalty, and weigh it against other priorities like high-interest debt or an underfunded emergency fund.