How to Use the Mortgage Calculator
- Enter the home price and your down payment.
- Choose a loan term and enter the interest rate (APR) from a lender quote.
- Add yearly property tax and homeowners insurance, plus monthly HOA dues if any.
- Leave the PMI rate at your lender’s quote. It only applies when you put down less than 20%.
- Press Calculate and open the yearly schedule to see how the balance falls.
Formula
Monthly P&I = L × r ÷ (1 − (1 + r)^−n) L = loan amount (price − down payment) r = annual rate ÷ 12 n = years × 12 Monthly payment = P&I + property tax ÷ 12 + insurance ÷ 12 + PMI + HOA
Example Calculation
A $400,000 home with $80,000 down leaves a $320,000 loan. At 6.5% for 30 years, principal and interest is about $2,022.62 a month. Adding $4,400 yearly property tax ($366.67) and $1,800 yearly insurance ($150) gives roughly $2,539 a month. Over 30 years you would pay about $408,000 in interest on top of the $320,000 borrowed.
What Is a Mortgage Calculator?
A mortgage calculator turns a handful of loan terms into a monthly payment and a total cost. It answers the question most buyers start with: “What will this house actually cost me each month?” Because it runs on a standard formula, you can change one input at a time and see the effect right away.
What Is Included in a Mortgage Payment?
Lenders often describe the payment as PITI: principal, interest, taxes and insurance. Principal reduces what you owe. Interest is the lender’s charge for the loan. Property tax and homeowners insurance are usually collected monthly in an escrow account. HOA dues and PMI are separate add-ons that depend on the property and your down payment.
What Affects Your Monthly Mortgage Payment?
The biggest drivers are the loan amount, the interest rate and the term. On a $320,000 loan, moving the rate from 6.5% to 5.5% lowers principal and interest by roughly $200 a month. Location matters as well, since property tax rates and insurance costs vary widely between states and even between neighboring towns.
How to Lower Your Mortgage Payment
- Increase your down payment to shrink the loan and avoid PMI.
- Compare rate quotes from several lenders on the same day.
- Ask whether paying discount points lowers the rate enough to justify the upfront cost.
- Appeal an inflated property tax assessment.
- Shop homeowners insurance and raise your deductible if you can absorb it.
- Later, use the refinance calculator to see whether a lower rate pays off.
15-Year vs 30-Year Mortgage
With the default numbers, a 15-year loan at the same rate has a payment that is about 40% higher, yet the total interest is less than half. The right choice depends on cash flow. Many buyers take the 30-year loan and make extra principal payments when their budget allows, keeping the flexibility to pay the minimum in a tight month.
Common Mistakes
- Budgeting only for principal and interest.
- Forgetting that property tax can be reassessed after you buy.
- Using a teaser rate that you will not qualify for.
- Draining savings for the down payment and leaving nothing for repairs.
Not sure what price range fits your income? Start with the mortgage affordability calculator, and read how to calculate a mortgage payment for a step-by-step walkthrough.