Mortgage Calculator Guide
Use this mortgage calculator to estimate the regular principal-and-interest payment, then add common housing costs for a more realistic monthly view. The Home Affordability Calculator can help you test a comfortable price range, while the Amortization Calculator shows how each payment changes the balance.
For broader planning, compare the Refinance Calculator, Debt-to-Income Ratio Calculator, and Rent vs Buy Calculator.
How does a mortgage calculator work?
The loan principal is the home price minus the down payment. A fixed-rate amortizing payment converts the annual rate to a monthly rate and spreads repayment across the selected number of months. Property tax, insurance, PMI and HOA are estimates of ownership costs; they do not reduce the mortgage balance.
What is included in the monthly payment?
Principal reduces what you owe and interest is the borrowing cost. Taxes and homeowners insurance may be collected through escrow, but practices vary. PMI can apply in some loan programs or lender situations, especially at a higher loan-to-value ratio; it is not universal. HOA fees are separate association charges.
How extra payments change the loan
Extra principal can shorten the schedule and reduce interest because future interest is calculated on a smaller balance. Confirm that your lender applies overpayments to principal and check any prepayment terms. Compare the result with the Down Payment Calculator when deciding how much cash to commit upfront.
Calculation Methodology & Assumptions
This page uses the standard fixed-rate amortizing formula. The monthly rate is the annual percentage divided by 12, and the number of payments is the term in years multiplied by 12. The schedule applies monthly, annual and one-time extra principal in the selected months. Small differences from a lender statement can come from rounding, payment dates, escrow, fees and daily-interest practices.
Practical mortgage example
For a hypothetical $400,000 home with an $80,000 down payment, a $320,000 loan at 6.5% for 30 years has an estimated principal-and-interest payment of about $2,022.62 per month, about $408,142.36 in scheduled interest and about $728,142.36 repaid. Taxes, insurance, PMI and HOA are not included in those figures.
Frequently asked questions
How much is the payment on a $300,000 mortgage?
It depends on the rate, term, down payment and added housing costs. Enter those assumptions above instead of relying on a single example.
What does a mortgage payment include?
Principal and interest are the loan payment. Taxes, insurance, PMI and HOA may add to the monthly cost but are separate from principal amortization.
How much does a larger down payment change the payment?
It reduces the amount borrowed and usually lowers principal-and-interest cost. It may also change the loan-to-value ratio and whether PMI is estimated.
Is property tax included in a mortgage payment?
Some lenders collect it through escrow, but the tax is not part of the loan balance. Use the advanced field for a separate monthly estimate.
Is a 15-year or 30-year mortgage better?
A 15-year term generally has a higher monthly payment and less scheduled interest. A 30-year term generally lowers the payment but can increase total interest. Compare both against your budget.
Why can a lender quote differ from this calculator?
Lenders may use a different rate, timing, rounding, fees, escrow assumptions, insurance quote or loan program. Treat this page as an educational estimate, not an offer.
How is PMI handled in this calculator?
Auto estimate applies PMI when the estimated loan-to-value ratio is above 80%. Include PMI always applies the entered rate, while No PMI sets it to zero. Actual lender and loan-program rules vary.
How are extra-payment savings calculated?
The calculator compares the selected schedule with the same loan and rate without extra principal. Interest saved is the difference in scheduled interest, and time saved is the difference in payoff months.
Trust and methodology
Sources: Consumer Financial Protection Bureau home-buying resources and HUD home-buying guidance. Mortgage calculator results are estimates for educational and planning purposes only, not mortgage, financial, tax or legal advice.