Mortgage Payment Calculator
How this mortgage payment calculator estimates housing costs
This mortgage payment calculator estimates the monthly cost of a fixed-rate home loan or refinance using the home price, down payment, annual rate, and repayment term you enter.
After the down payment is subtracted from the home price, the calculator applies the standard amortization formula to that borrowed principal. It uses the annual rate converted to a monthly rate and the loan term converted to monthly payments, then displays the resulting principal-and-interest payment.
In math terms, if the mortgage principal is , the monthly interest rate is , and the number of monthly payments is , the fixed-rate principal-and-interest payment is:
For a complete monthly housing estimate, this calculator adds the entered annual property tax and home insurance divided by twelve. It also estimates PMI as annual PMI rate times borrowed principal, divided by twelve, only when the down payment is below 20% of the home price.
For example, a $250,000 mortgage paid over 30 years at 5% has a principal-and-interest payment of about $1,342 per month. That figure is useful for comparing loan terms, but it does not by itself include any property tax, insurance, or PMI you may need to budget for.
Why compare mortgage payments before choosing a loan?
A mortgage payment estimate helps turn a home price into a recurring budget commitment. By changing the price, down payment, rate, or term, homebuyers can see how each choice affects the principal-and-interest payment and the total interest paid over time.
The same comparison can be useful when refinancing. Enter the balance you expect to finance as the home price and use a zero down payment to model the new loan’s principal-and-interest payment; then compare that estimate with the existing payment and any costs not shown here.
Looking at more than one lender quote is easier when each scenario uses the same assumptions. A lower rate generally lowers the payment and total interest, while a longer term generally lowers the monthly principal-and-interest payment but increases the time interest accrues.
How to read your mortgage payment breakdown
The mortgage result begins with principal and interest, which is the fixed loan payment calculated from the financed amount, rate, and term. It then lists estimated PMI separately, combines the monthly portions of property tax and home insurance, and shows the resulting total monthly housing cost.
Total interest is the difference between all scheduled principal-and-interest payments and the amount borrowed. Total payment is the scheduled principal-and-interest amount over the term; it does not include the optional tax, insurance, or PMI estimates because those amounts can change independently of the loan.
If you enter a PMI rate and your down payment is under 20% of the home price, the tool estimates a monthly PMI amount. A zero PMI rate, or a down payment of at least 20%, produces no PMI estimate in this calculator.
Understanding the mortgage payment inputs
Every field in this mortgage payment calculator corresponds to either the amount financed or a recurring housing expense. Home Price is the purchase price, while Down Payment is subtracted from it to determine the principal borrowed. Annual Interest Rate is converted to a monthly rate, and Loan Term is converted from years to the number of scheduled monthly payments. Property Tax, Home Insurance, and PMI Rate are optional inputs used for the monthly cost estimate.
Enter property tax and home insurance as annual dollar amounts, not monthly amounts, because the calculator divides each by twelve. Enter the PMI rate as an annual percentage; the calculator applies it to the financed principal when the down payment is below 20%.
Step-by-step mortgage payment calculation
To produce a mortgage payment estimate, enter the loan assumptions in the same order used by the calculation:
- Enter the home’s purchase price and the cash down payment you expect to make.
- Enter the annual interest rate and loan term offered for the fixed-rate mortgage.
- Add annual property tax and insurance estimates, plus a PMI rate if it applies. The calculator converts annual tax and insurance to monthly amounts.
- Click Calculate to view principal and interest, estimated PMI, monthly tax and insurance, total monthly cost, total interest, and total principal-and-interest payments.
- Use the Copy Result button to place the displayed mortgage summary on your clipboard for comparing scenarios.
Mortgage payment example with taxes, insurance, and PMI
Consider a $350,000 home with a 10% down payment, a 5% annual rate, and a 30-year term. The financed principal is $315,000, producing a principal-and-interest payment of about $1,691 per month. With $3,000 in annual taxes, $1,200 in annual insurance, and a 0.5% PMI rate, the calculator estimates about $131 monthly PMI and $350 monthly tax and insurance, for a total monthly cost of roughly $2,173. The example shows why the loan payment alone is not the full housing budget.
Using mortgage results for longer-term planning
The total interest and total payment figures show the scheduled cost of the mortgage principal and interest over the entire term. A rate change, larger down payment, or shorter term can alter both the monthly payment and the amount of interest paid, so it is worth comparing alternatives with consistent assumptions.
If the estimated monthly cost is beyond your target budget, test a lower home price, a larger down payment, or different loan terms. Review the tax, insurance, and PMI entries as carefully as the interest rate, since these recurring costs are included in the calculator’s total monthly cost but may change over time.
Mortgage estimate limitations and next steps
This mortgage calculator models a fixed interest rate for the full loan term. It does not calculate adjustable-rate changes, closing costs, lender fees, escrow adjustments, prepayments, or the effect of making extra payments. Actual property tax, insurance, and mortgage insurance charges may differ from the estimates entered.
Use the results as a planning estimate rather than a loan offer. Confirm payment details, eligibility requirements, taxes, insurance, and all closing costs with the lender or qualified housing professional before making a borrowing decision.
Mortgage APR versus the interest rate
For this mortgage payment calculation, the interest rate is the annual percentage converted into the monthly rate used in the amortization formula. Annual percentage rate (APR) can incorporate certain finance charges and points, so loans with similar stated rates can have different APRs. Use this calculator to compare rate-based payment mechanics, then evaluate APR and closing costs alongside the payment.
Mortgage term comparison table
This mortgage term comparison shows how the same principal and rate can produce a lower monthly payment with a longer term but more total interest. The figures are principal and interest only; use the form above for a scenario that includes your own tax, insurance, and PMI assumptions.
| Loan amount | Rate | Term | Monthly payment | Total interest |
|---|---|---|---|---|
| $250,000 | 5.00% | 30 years | $1,342 | ≈ $233,000 |
| $250,000 | 5.00% | 15 years | $1,977 | ≈ $106,000 |
Mortgage Amortization Dash Mini-Game
Steer payment packets to keep your principal-share aligned as the loan matures. Early rounds are interest-heavy, later rounds reward principal focus.