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Buying a home is usually the largest purchase a person makes in the United States, and the monthly payment is rarely just the loan itself. Property tax and homeowners insurance sit on top of the principal and interest, and together they decide whether a house is truly affordable. This free mortgage calculator brings all four pieces together, so you can test a price, a down payment, and a rate before you make an offer.
How to Use This Mortgage Calculator
Enter the home price first — the full asking price or the price you expect to offer, not the loan amount. Then choose the down payment type: Percent, and type 20 for 20% down, or Amount, and type the dollar figure directly, for example 80000. The calculator subtracts the down payment from the price to find the amount you actually borrow.
Next, add the annual interest rate and the loan term in years: 30 years is the most common US term, and 15 years is the usual shorter choice. Finally, add your annual property tax and annual homeowners insurance if you know them. Both are optional, but leaving them out gives you only the loan payment, not the full monthly bill. Press Calculate to see the loan amount, the principal-and-interest payment, the monthly tax and insurance, and the total. In short, a mortgage calculator estimates your monthly home-loan payment from the home price, down payment, interest rate, and loan term — and this one also adds monthly property tax and homeowners insurance, so the total reflects the full amount a homeowner usually pays.
What Makes Up Your Monthly Mortgage Payment
Lenders and buyers in the US often shorten the four parts to P-I-T-I: principal, interest, taxes, and insurance. Principal reduces what you owe. Interest is the lender’s charge for letting you borrow. Property tax goes to your local government and is usually collected monthly by your lender and held in escrow. Homeowners insurance protects the home against fire, storms, and other covered damage, and a lender will normally require it while you have the loan.
The principal-and-interest part is fixed for the life of a fixed-rate mortgage, so this calculator can estimate it precisely. Tax and insurance can change from year to year, so treat those lines as estimates. If your down payment is below 20%, your lender may also require private mortgage insurance (PMI), a fifth cost on top of the four shown here. A mortgage loan is secured by the home itself, which is why lenders can offer lower rates than on an unsecured personal loan — and also why missing payments puts the home at risk.
How the Principal-and-Interest Payment Is Worked Out
The loan part uses the same amortizing formula as any fixed-rate loan: monthly principal and interest = P × r × (1 + r)n ÷ ((1 + r)n − 1), where P is the loan amount, r is the monthly rate — the annual rate divided by 12 and then by 100 — and n is the number of monthly payments. With a 30-year term, n is 360; with a 15-year term, n is 180.
Each payment covers that month’s interest first, then the rest reduces the balance. Early in a 30-year mortgage, interest takes up most of the payment, because the balance is large. As the balance drops, the principal slice grows, while the payment itself never changes on a fixed-rate loan. If the rate is 0%, there is no interest to add, so the payment is just the loan amount split evenly across the months. Monthly tax is the annual tax divided by 12, monthly insurance is the annual insurance divided by 12, and the total is all three added together.
Worked Example: A $400,000 Home With 20% Down
Take a home priced at $400,000 with a 20% down payment. Twenty percent of $400,000 is $80,000, so the loan amount is $320,000. At 6.5% over 30 years, the monthly rate is 0.0054167 and the number of payments is 360. The principal-and-interest payment works out to $2,022.62 a month.
Now add the other two costs. Annual property tax of $4,800 divided by 12 is $400 a month; annual homeowners insurance of $1,800 divided by 12 is $150 a month. The total is $2,022.62 plus $400 plus $150, which is $2,572.62 a month. That $550 gap is exactly the part many first-time buyers forget to budget for. On a 15-year term, the principal-and-interest payment rises to $2,787.54 a month, so the total becomes $3,337.54 — higher each month, but the loan is cleared in half the time and total interest is far lower. If your total looks higher than the principal-and-interest figure alone, that is because the total also includes property tax and homeowners insurance, usually collected monthly and held in escrow by your lender. In the example above, those two items added $550 a month to a $2,022.62 loan payment.
Monthly Principal-and-Interest at 6.5% for Common Loan Amounts
The table below shows only the principal-and-interest part, before tax and insurance, at a 6.5% annual rate. Add your own monthly tax and insurance to reach your full payment.
| Loan Amount | 30 Years | 15 Years |
|---|---|---|
| $200,000 | $1,264.14 | $1,742.21 |
| $320,000 | $2,022.62 | $2,787.54 |
| $450,000 | $2,844.31 | $3,919.98 |
The table makes the term trade-off plain: a 15-year loan costs roughly 38% more each month than a 30-year loan for the same amount, yet it wipes out the debt in half the time. A smaller loan helps just as much: dropping from a $450,000 loan to a $320,000 loan saves more than $800 a month on a 30-year schedule. A 15-year mortgage has a higher monthly payment but much lower total interest and a far earlier payoff. A 30-year mortgage has a lower monthly payment, but costs considerably more interest over its life.
Ways to Bring Your Monthly Payment Down
The most direct lever is the down payment: a bigger down payment means a smaller loan, a smaller monthly payment, and less interest overall, and saving 20% usually avoids PMI. The rate is the second lever: even a half-point difference changes the payment by a meaningful amount on a large loan, so compare offers from more than one lender. For a general-purpose loan, try our loan calculator, and for the loan payment alone, our EMI calculator gives you that number in its simplest form. Do not shop by the loan payment alone: two homes with the same price can carry very different tax bills. There is no single answer for the whole US. Many conventional loans work best with 20% down, because that usually avoids PMI, but some loan programs allow far less. A smaller down payment means a larger loan and a higher payment.
What This Calculator Does Not Cover
This tool estimates principal, interest, property tax, and homeowners insurance for a fixed-rate mortgage. It does not include PMI, homeowners association dues, flood insurance, closing costs, or any change to an adjustable rate, and it assumes the rate stays fixed and every payment is made on time. Your lender’s final Loan Estimate will include the exact fees and escrow amounts.
Test a few prices and down payments, keep the total — not just the loan payment — inside your budget, and you will know exactly what you can afford.