How to use the mortgage calculator
Enter the home price, down payment, annual interest rate, and loan term first. Those inputs determine the loan amount and scheduled principal-and-interest payment. Then add property taxes, homeowners insurance, mortgage insurance, and HOA dues if they apply to the home you are evaluating.
The main result is an estimated monthly housing payment. Use the Chart, Amortization, and Schedule tabs to inspect the cost breakdown, see how the balance changes, expand individual years, export the schedule as CSV, or print a clean copy.
For a useful comparison, change one variable at a time. For example, compare a 15-year and 30-year term with the same loan amount and rate, or keep the term fixed and test a larger down payment. That makes the effect on monthly payment and total interest easier to interpret.
What is included in a monthly mortgage payment
A mortgage payment is often discussed as though it were one number, but the total amount leaving a household each month can contain several components. Principal reduces the loan balance. Interest is the lender's charge for borrowing. Property taxes and homeowners insurance may be collected through an escrow account. Mortgage insurance can apply to some loans, and HOA dues can add another recurring housing cost.
The common abbreviation PITI stands for principal, interest, taxes, and insurance. Our total goes a step further when you enter mortgage insurance or HOA dues, because those costs can matter when you compare a mortgage payment with a monthly housing budget.
The Consumer Financial Protection Bureau explains that a total monthly mortgage payment commonly includes costs beyond principal and interest, including property taxes, homeowners insurance, and possibly mortgage insurance. See the CFPB explanations of PITI and principal and interest versus total monthly payment.
Mortgage payment formula and amortization method
M = monthly principal and interest · P = mortgage principal · r = monthly interest rate · n = total monthly payments
The annual interest rate is divided by 12 to obtain the monthly rate. The loan term in years is multiplied by 12 to obtain the number of scheduled monthly payments. If the interest rate is 0%, the calculator uses principal divided by the number of payments instead of the standard formula.
Property tax, homeowners insurance, PMI, and HOA dues use the monthly amounts entered. Extra principal is kept separate from the required monthly estimate and applied to the amortization schedule at the selected monthly, yearly, or one-time interval. Payment components are rounded to cents and the final payment is adjusted so the modeled balance reaches zero.
Mortgage inputs explained
Home price and down payment
The loan amount is the home price minus the down payment. A higher down payment reduces the modeled principal. It can also affect real-world mortgage-insurance requirements, although this tool does not determine eligibility.
Interest rate
Use the annual note rate that applies to the loan scenario. Do not automatically substitute APR: APR can include certain fees and other costs in addition to interest.
Loan term
The term controls how many monthly payments are used to amortize the loan. Common fixed-rate examples are 15, 20, and 30 years, but the calculator accepts other terms within its input range.
Taxes and insurance
Enter realistic monthly estimates when possible. Property taxes and insurance can change after purchase, so the monthly total is a planning estimate rather than a permanent payment guarantee.
Mortgage insurance and HOA
Enter these as monthly dollar amounts if they apply. They are shown separately from principal and interest so you can see what is loan cost versus other recurring housing cost.
Closing costs and extra principal
Closing costs are estimated as a percentage of price and added to upfront cash, not loan principal. Optional monthly, yearly, and one-time extra payments are applied to principal in the schedule.
Interest rate vs. APR on a mortgage
The mortgage interest rate is used to calculate interest on the outstanding principal. APR, or annual percentage rate, is designed as a broader comparison measure and can reflect certain fees and points in addition to interest. Because a principal-and-interest payment formula needs the note rate, the calculator labels that input as interest rate.
If a lender quote lists both values, compare like with like. Use the note rate to model the scheduled principal-and-interest payment, while APR can be useful when comparing borrowing costs across offers that have different fee structures.
The CFPB explains that mortgage APR is a broader measure of borrowing cost than the interest rate because it can reflect points, broker fees, and other charges.
How to compare mortgage scenarios
15-year vs. 30-year mortgage
A shorter term generally means a higher monthly principal-and-interest payment but fewer interest-bearing months. Compare both the payment and total modeled interest.
Larger down payment
Increase the down payment while keeping the home price, rate, and term fixed. The result shows how a smaller loan principal changes the payment and interest cost.
Extra monthly principal
Add a realistic extra-principal amount and compare the modeled payoff month and interest savings with the normal schedule.
What this mortgage estimate does not include
This is a fixed-rate mortgage planning model, not a lender quote or affordability approval. The closing-cost percentage is a broad estimate, not an itemized Loan Estimate. The tool does not calculate discount points, lender-specific fees, mortgage-insurance eligibility, escrow shortages, utilities, repairs, maintenance, renovations, moving costs, or future changes in taxes and insurance.
It also assumes the entered interest rate remains fixed. Adjustable-rate mortgages, interest-only periods, balloon payments, biweekly payment plans, and other specialized loan structures need different calculations.
For official homebuying guidance, see the CFPB resources on mortgage payment calculations and its Loan Estimate explainer.
Example: Jordan plans a $425,000 home purchase
Jordan is considering a $425,000 home with an $85,000 down payment, leaving a $340,000 mortgage. At an illustrative 6.5% fixed annual rate over 30 years, principal and interest are $2,149.03 per month. Adding $280 in property tax and $125 in homeowners insurance brings the monthly estimate to $2,554.03, with PMI and HOA dues set to zero.
At 3% of the purchase price, estimated closing costs are $12,750. Adding the down payment gives $97,750 in estimated upfront cash. The closing-cost percentage is a broad planning assumption, not an itemized cash-to-close calculation.
Mortgage payment and home affordability are not the same thing
A mortgage calculator can estimate the recurring costs entered into the tool, but a payment that fits the calculator is not automatically affordable for a household. A full housing budget may also need room for utilities, maintenance, repairs, furnishings, moving costs, and savings for irregular expenses.
Lenders also evaluate borrower-specific information that this calculator does not know, including income documentation, debts, credit profile, loan program rules, and the property being financed. Use the monthly payment as one input in a broader affordability decision rather than as an approval estimate.
Calculator estimate vs. a lender Loan Estimate
This page is useful for comparing scenarios before or while shopping for a mortgage. Once a lender provides a Loan Estimate, use that disclosure for lender-specific numbers such as estimated closing costs, points, lender credits, prepaid items, cash to close, and the APR shown for that offer.
The strongest comparison is not just the lowest monthly payment. Compare the interest rate, APR, loan term, cash required up front, recurring mortgage insurance when applicable, and total borrowing cost over the period you realistically expect to keep the loan.
Mortgage calculator FAQs
How is a monthly mortgage payment calculated?
For a standard fixed-rate mortgage, principal and interest are calculated from the loan principal, monthly interest rate, and number of monthly payments. Property taxes, homeowners insurance, mortgage insurance, and HOA dues are separate recurring costs that can be added to estimate a broader monthly housing payment.
What is included in this mortgage calculator?
The calculator includes principal and interest, monthly property taxes, homeowners insurance, mortgage insurance, HOA dues, estimated closing costs, and optional monthly, yearly, or one-time extra principal. It also provides a payment breakdown, amortization chart, and downloadable payment schedule.
What is PITI?
PITI means principal, interest, taxes, and insurance. It describes four common parts of a monthly mortgage payment. HOA dues and mortgage insurance can be additional recurring costs when they apply.
What is the difference between a mortgage interest rate and APR?
The interest rate is the rate used to calculate interest on the loan balance. APR is a broader measure of borrowing cost that can include certain fees and points. This calculator uses the interest rate field for the principal-and-interest calculation.
How does a down payment affect the mortgage payment?
A larger down payment reduces the amount borrowed, which generally reduces the principal-and-interest payment. It can also affect whether mortgage insurance applies, but this calculator does not determine PMI eligibility.
What is PMI?
Private mortgage insurance, or PMI, can apply to some conventional mortgages when the borrower has a smaller equity position. Because eligibility and pricing depend on the loan, this calculator asks for a monthly mortgage-insurance amount instead of inventing one.
Will extra principal shorten the mortgage term?
In this fixed-rate model, monthly, yearly, or one-time extra principal lowers the balance sooner, which reduces later interest and can shorten the payoff period. Check your loan terms and servicer instructions to confirm that extra payments are allowed and applied to principal.
Does this calculator include closing costs, utilities, or maintenance?
It provides a simple closing-cost estimate using the percentage you enter. It does not itemize lender fees or include utilities, maintenance, repairs, moving costs, or future changes in taxes and insurance.
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Use the Loan Payment Calculator for a general fixed-rate installment loan. To estimate income after federal withholding and payroll taxes, use the 2026 Paycheck Calculator.
For planning and educational use. This calculator models a fixed-rate mortgage using the inputs you provide and does not constitute a mortgage offer, approval, tax advice, insurance quote, or recommendation.