Mortgage Payment Calculator

How the Mortgage Payment Calculator Works

This mortgage calculator turns a home price, down payment, interest rate and loan term into a realistic monthly payment. Unlike basic calculators that show only principal and interest, it also adds property tax, homeowners insurance and HOA dues — the items that make up your true monthly housing cost, often called PITI.

Change the term from 30 to 15 years and watch the trade-off: the monthly payment rises, but total interest drops dramatically. Try a few interest rates too, since even half a percentage point changes the payment by tens of dollars per month and the lifetime cost by thousands.

What Is Included in a Mortgage Payment?

Your payment has four common parts: principal (paying down the loan), interest (the lender's charge), property taxes and homeowners insurance. Many lenders collect taxes and insurance monthly into an escrow account. If you put down less than 20% on a conventional loan you will usually also pay private mortgage insurance until you reach about 20% equity.

How Much Should You Spend on Housing?

A common guideline is that total housing costs should stay near or below 28% of gross monthly income, and total debt payments near or below 36%. Lenders may approve higher ratios, but a payment that fits comfortably in your real budget matters more than the maximum you qualify for. Use our debt-to-income calculator to check your own ratios.

Example: A $350,000 Home With 20% Down

With $70,000 down, a $280,000 loan at 6.5% for 30 years has a principal-and-interest payment near $1,770. Add roughly $350 a month for property tax and $125 for insurance and the monthly total is about $2,245. Over the full term you would repay roughly $357,000 in interest on top of the $280,000 borrowed.

Switching to a 15-year term at a slightly lower rate raises the payment considerably but cuts lifetime interest by more than half, which is why the term you choose matters as much as the rate.

How to Read Your Results

The headline number is your estimated total monthly payment. Compare it with the 28% guideline by dividing by your gross monthly income. The "total interest" line shows the true cost of borrowing, and the down payment percentage tells you whether you are likely to owe private mortgage insurance.

Ways to Lower Your Payment

• Increase your down payment or wait to save more.
• Shop several lenders and compare the Loan Estimate documents.
• Improve your credit score before locking a rate.
• Consider a longer term only if the payment stress outweighs the extra interest.
• Appeal an unusually high property tax assessment.

The Mortgage Payment Formula Explained

Principal-and-interest payments on a fixed-rate loan use the standard amortization formula: M = P × r ÷ (1 − (1 + r)^−n). In this formula, M is the monthly payment, P is the loan amount, r is the monthly interest rate (the annual rate divided by 12) and n is the number of monthly payments (years times 12). Property tax, homeowners insurance and HOA dues are added separately. The calculator above does all of this automatically, and it also adds your yearly tax and insurance divided by twelve.

For a $300,000 loan at 6.5% over 30 years, r is 0.065 ÷ 12 = 0.005417 and n is 360. The result is a payment of about $1,896. That payment never changes on a fixed-rate loan, but the split between interest and principal shifts every month. See how in how mortgage interest works.

Monthly Principal and Interest by Loan Amount and Rate

This table shows how loan size and rate change the payment on a 30-year loan (principal and interest only):

A one-point change in rate at a $400,000 loan moves the payment by roughly $260 a month. That is why shopping lenders and improving your credit before applying can be worth thousands of dollars per year. See how credit scores affect rates.

How Loan Term Changes the Payment and Total Interest

A shorter term raises the payment but reduces total interest dramatically. If you want the flexibility of a 30-year loan, you can still pay extra toward principal when your budget allows. Try different terms in the calculator above and compare the total interest line.

Step-by-Step: How to Use This Mortgage Calculator

1. Enter the home price you are considering.
2. Enter the down payment in dollars. Remember that less than 20% usually means paying mortgage insurance. See PMI explained.
3. Enter the interest rate from a lender quote or a current rate estimate.
4. Choose the loan term.
5. Add yearly property tax and homeowners insurance. Use your county assessor and insurance quotes for accurate numbers, or try the property tax calculator.
6. Include monthly HOA dues if you are buying a condo or in a planned community.
7. Review the total monthly payment and compare it with your income using the home affordability calculator.

What This Calculator Does Not Include

Mortgage insurance, closing costs, moving expenses, utilities, maintenance and repairs are not included. Add roughly 1% of the home value per year for maintenance (see home maintenance budget guide), and plan for 2% to 5% of the price in closing costs (see closing costs explained). If your loan has an adjustable rate, your payment can change after the initial period; read fixed vs adjustable rates.

Mortgage Calculator Mistakes to Avoid

• Using an old or advertised best-case rate instead of a realistic quote.
• Leaving out property tax and insurance, which can add hundreds per month.
• Forgetting that taxes may increase after purchase because of reassessment.
• Choosing the largest payment you qualify for without a buffer.
• Ignoring mortgage insurance when the down payment is small.
• Not testing a higher rate to see whether you can afford the payment if rates change before you lock.

Next Steps After You Calculate Your Payment

Once you know a comfortable payment, get pre-approved by several lenders in a short window to compare rates and fees; see hard vs soft inquiries. Read the first-time home buyer checklist, explore programs such as FHA and VA loans, and check down payment assistance if cash is tight. If you already own, compare your loan with the refinance break-even calculator.

Understanding Each Input in the Calculator

• Home price: the agreed purchase price, not the appraised value. If you are still shopping, test a range, such as your target price and prices 10% above and below.
• Down payment: cash you pay upfront. It reduces the loan, and reaching 20% typically removes the need for private mortgage insurance on conventional loans.
• Interest rate: the annual rate on your loan. Use a rate from a lender quote and remember that rates depend on credit, down payment and loan type.
• Loan term: the number of years. Thirty years is most common, while 15 years builds equity faster.
• Property tax: the yearly amount charged by your local government, often paid monthly through escrow.
• Homeowners insurance: the yearly premium for your policy, also usually escrowed.
• HOA dues: monthly fees for shared amenities in a condo or planned community.

Understanding Each Result

The total monthly payment is what you will likely send to your servicer each month for principal, interest, taxes, insurance and HOA dues. The principal and interest line is the fixed part of the payment. The loan amount is the price minus your down payment. The total interest shows what you would pay over the life of the loan if you keep it to the end and make no extra payments. The down payment percentage tells you whether mortgage insurance may apply. Together, these figures show the real cost of the home and help you decide whether a lower price, higher down payment or shorter term fits your goals.

Mortgage Payment results at a glance

These are the calculator's results at different values of home Price, with every other input left at the example values above (the bold row is the example). Use them to see how quickly the result changes before entering your own numbers.

How loan Term changes the result

The same example with each loan Term option:

What changing down Payment does

Holding everything else at the example values, here is the effect of down Payment:

How much income a mortgage payment needs

Lenders often look for total housing costs of no more than about 28% of gross monthly income. Here is the gross income that guideline implies for common monthly payments, including taxes and insurance:

Lenders also check total debt, including car and student loans, against income; the debt-to-income ratio calculator shows where you stand.