Mortgage Calculator
Estimate your monthly mortgage payments and view your full amortization schedule.
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How the Mortgage Calculator Works
Our mortgage calculator helps you estimate your monthly home loan payments by taking into account the home price, down payment, interest rate, loan term, property taxes, home insurance, and HOA fees. This gives you a complete picture of your monthly housing cost — often referred to as PITI (Principal, Interest, Taxes, and Insurance).
Mortgage Payment Formula
The core monthly principal and interest payment is calculated using the standard amortization formula:
M = P × [ r(1+r)n ] / [ (1+r)n − 1 ]
Where:
- M = Monthly payment
- P = Loan amount (home price minus down payment)
- r = Monthly interest rate (annual rate ÷ 12)
- n = Total number of payments (years × 12)
For a concrete example, consider a $320,000 loan (after a $80,000 down payment on a $400,000 home) at 6.5% interest over 30 years. The monthly rate is 0.065 ÷ 12 = 0.005417, and the number of payments is 360. Plugging those into the formula gives a principal-and-interest payment of about $2,022.62. Add $400 in monthly property tax, $100 in insurance, and any HOA dues to arrive at your full PITI payment.
What Is Included in Your Monthly Payment?
- Principal: The portion of your payment that reduces your loan balance.
- Interest: The cost of borrowing, based on your interest rate and remaining balance.
- Property Taxes: Annual taxes divided by 12, paid as part of your monthly payment.
- Home Insurance: Annual insurance premium divided by 12.
- HOA Fees: Monthly homeowners association dues, if applicable.
Lenders typically escrow taxes and insurance, meaning they collect a portion each month alongside principal and interest and pay those bills on your behalf. This keeps your housing costs predictable and ensures tax and insurance obligations are never missed. HOA dues are usually paid directly to the association, but including them here gives you a true picture of total monthly housing cost.
Understanding the Amortization Schedule
The amortization schedule breaks down every payment over the life of the loan, showing how much goes to principal versus interest and the remaining balance after each period. In the early years, the vast majority of each payment is interest because the loan balance is at its highest. As the balance shrinks, the interest portion of each payment shrinks too, and more of your money goes toward principal. By the final years of a 30-year loan, almost the entire payment is principal.
This is why making extra principal payments early in the loan has an outsized effect. An extra $100 per month applied to principal in year one of the example loan above can shorten the term by several years and save tens of thousands in interest. The amortization table in the results makes this visible — scan down the "Interest Paid" column to see how much you'd save by trimming years off the end.
Fixed-Rate vs. Adjustable-Rate Mortgages
This calculator models a fixed-rate mortgage, where the interest rate stays constant for the entire term. Adjustable-rate mortgages (ARMs) start with a lower fixed rate for an introductory period — often 5, 7, or 10 years — then adjust periodically based on a market index. ARMs can save money if you plan to sell or refinance before the adjustment, but they carry the risk of higher payments later. If you're comparing an ARM to a fixed loan, run the numbers at both the introductory rate and a plausible adjusted rate to understand the worst-case scenario.
The 28/36 Rule and Affordability
Lenders often use the 28/36 rule to gauge affordability. Your total monthly housing payment (PITI) should not exceed 28% of your gross monthly income, and your total monthly debt — including the mortgage, car loans, student loans, and credit card minimums — should not exceed 36%. On a $90,000 income, that means a housing payment up to about $2,100 and total debt up to about $2,700. These thresholds aren't laws, but staying within them makes approval more likely and keeps your budget sustainable.
Down Payment Considerations
A larger down payment reduces your loan amount, which lowers your monthly payment and total interest. It can also help you avoid private mortgage insurance (PMI), which is typically required when you put down less than 20%. PMI can add $50 to $200 or more to your monthly payment, so reaching the 20% threshold is a meaningful savings target. Some loan programs — such as VA and certain conventional loans — allow lower down payments without PMI, so check what's available to you before assuming 20% is required.
Tips for Lowering Your Mortgage Payment
- Increase your down payment to reduce the loan amount.
- Shop around for the best interest rate — even 0.5% makes a big difference over 30 years.
- Choose a longer loan term for lower monthly payments (but more total interest).
- Improve your credit score before applying to qualify for better rates.
- Consider paying points upfront to reduce your interest rate.
- Appeal your property tax assessment if you believe your home is overvalued.
- Review your home insurance annually and compare quotes to keep premiums competitive.
Frequently Asked Questions
The monthly payment is calculated using the amortization formula, which factors in the loan amount, monthly interest rate, and total number of payments. Property taxes, insurance, and HOA fees are added to give you the total monthly cost.
The interest rate is the cost of borrowing the principal. The APR (Annual Percentage Rate) includes the interest rate plus other costs like lender fees, making it a more complete measure of the loan's cost.
This calculator does not currently include Private Mortgage Insurance (PMI). If your down payment is less than 20% of the home price, you will typically need PMI, which can add $50–$200+ to your monthly payment.
The calculator uses standard amortization formulas and provides accurate estimates. Actual payments may vary based on your lender's specific terms, fees, and rounding methods.