Calculate estimated monthly mortgage payments, total interest, and repayment costs using your loan amount, interest rate, and term to compare different home financing scenarios.
| Year | Principal paid | Interest paid | Balance remaining |
|---|---|---|---|
|
Click "Calculate payment" to see your amortization schedule |
|||
See the difference in monthly payments
Monthly payment = P × [r(1 + r)^n] ÷ [(1 + r)^n − 1]
P = principal, r = periodic interest rate, n = number of payments.The calculator applies the entered principal or balance, periodic interest rate, repayment term and any supported fees or extra payments. Payment and interest figures depend on compounding frequency, payment timing and which taxes, insurance or charges are included.
Use the Mortgage Calculator to estimate your monthly home loan payment, total mortgage interest, and potential housing costs before buying a home in the United States. Enter a home price, down payment, annual interest rate, and loan term to calculate the estimated monthly principal and interest payment. Depending on the available fields, you may also account for property taxes, homeowners insurance, private mortgage insurance (PMI), and HOA fees. Compare different loan amounts, interest rates, and repayment periods to understand how each choice affects your monthly budget and long-term borrowing costs. Results are estimates, not lender-approved payment quotes.
Enter your mortgage details using the fields available in the calculator. Start with the purchase price and down payment, then enter the interest rate and loan term. Include additional housing expenses if the calculator supports them.
After entering the details, review the estimated payment. Change one input at a time to identify how the purchase price, down payment, interest rate, or repayment term affects the calculation.
A Mortgage Calculator estimates the monthly payment required to repay a mortgage over a specified period. For a standard fixed-rate, fully amortizing loan with monthly payments, it uses the principal balance, monthly interest rate, and total number of payments to calculate a level principal-and-interest payment. If additional expense fields are available, estimated taxes, insurance, and other monthly housing charges may be added to show a broader monthly housing cost.
The calculation begins with the amount borrowed. If you purchase a $300,000 home and make a $60,000 down payment, the initial loan amount is $240,000, excluding financed fees.
Each monthly payment on a conventional fully amortizing fixed-rate mortgage is divided between interest and principal. Interest is calculated on the outstanding loan balance, so early payments generally contain more interest. As the balance decreases, more of each scheduled payment goes toward principal.
For an adjustable-rate mortgage (ARM), the payment may change after the initial rate period. A fixed-rate calculation cannot reliably predict future ARM payments without assumptions about rate adjustments, caps, and future interest rates.
The standard monthly payment formula for a fixed-rate, fully amortizing mortgage is:
M = P × [r(1 + r)^n] / [(1 + r)^n − 1]
Where:
Convert the annual interest rate to a monthly decimal rate:
r = Annual Interest Rate (%) / 100 / 12
Calculate the number of monthly payments:
n = Loan Term in Years × 12
For example, a 30-year mortgage has 360 scheduled monthly payments. At an annual interest rate of 6.5%, the monthly rate is approximately 0.005416667.
For a 0% interest mortgage, the formula simplifies to M = P / n, because there is no interest charge.
Total Scheduled Payments = Monthly Principal and Interest Payment × Number of Payments
Total Mortgage Interest = Total Scheduled Payments − Original Loan Principal
These formulas assume a fixed interest rate, equal monthly payments, no additional principal payments, and a loan that is fully repaid at the end of the term. They do not include taxes, insurance, or other housing charges.
Consider a hypothetical homebuyer purchasing a $300,000 property in the United States with a 20% down payment and a 30-year fixed-rate mortgage. Assume a 6.5% annual interest rate solely to demonstrate the calculation, not as a current mortgage rate quote.
| Mortgage Detail | Value |
|---|---|
| Home Purchase Price | $300,000 |
| Down Payment | $60,000 (20%) |
| Mortgage Loan Amount | $240,000 |
| Annual Interest Rate | 6.5% |
| Loan Term | 30 Years |
| Monthly Payments | 360 |
| Monthly Interest Rate | 0.5416667% |
| Calculation Result | Estimated Amount |
|---|---|
| Monthly Principal and Interest | $1,516.96 |
| Total Principal Repaid | $240,000.00 |
| Total Interest Over 30 Years | $306,106.77 |
| Total Principal and Interest Payments | $546,106.77 |
Interpretation: With these assumptions, the borrower would pay approximately $1,516.96 per month toward mortgage principal and interest. Across the full 30-year repayment period, approximately $306,106.77 would be paid in interest, provided the rate and payment schedule remain unchanged and no additional principal payments are made.
The lifetime totals use the unrounded calculated payment. Multiplying the displayed payment rounded to cents may produce a small difference. Actual payment schedules can also vary because of lender rounding and final-payment adjustments.
A monthly mortgage payment may include more than principal and interest. To illustrate the difference, assume the same home has hypothetical annual property taxes of $3,600 and annual homeowners insurance of $1,500.
| Monthly Housing Component | Estimated Cost |
|---|---|
| Principal and Interest | $1,516.96 |
| Property Taxes ($3,600 / 12) | $300.00 |
| Homeowners Insurance ($1,500 / 12) | $125.00 |
| Estimated Monthly Total | $1,941.96 |
The estimated monthly housing payment becomes $1,941.96 when these assumed taxes and insurance costs are included. This example excludes HOA fees, maintenance, utilities, and other potential housing expenses. With a 20% down payment, conventional-loan PMI is generally not required at origination, although different mortgage programs can have different insurance requirements.
The most important output is usually the estimated monthly principal and interest payment. Some calculators also provide a total monthly payment estimate, lifetime interest, total repayment amount, or a breakdown of principal and interest over time.
This amount represents the scheduled payment toward the mortgage balance and interest charges. For a standard fixed-rate, fully amortizing mortgage, the principal-and-interest payment normally remains the same throughout the loan term.
It does not automatically include property taxes, homeowners insurance, mortgage insurance, HOA fees, or maintenance.
When additional expenses are included, the calculator may estimate a combined monthly housing payment. Principal, interest, taxes, and insurance are commonly grouped as PITI.
Estimated PITI = Principal and Interest + Monthly Property Taxes + Monthly Homeowners Insurance
If applicable, add monthly mortgage insurance and HOA fees separately. Escrow amounts may change as actual property taxes and insurance premiums change, even when the loan has a fixed interest rate.
Total interest shows the projected borrowing cost over the scheduled repayment period. A longer mortgage term generally reduces the required monthly principal-and-interest payment but increases lifetime interest when the loan amount and interest rate are held constant.
If the calculator provides an outstanding-balance or amortization feature, the remaining loan balance shows how much principal is still owed after a given number of scheduled payments. This amount is not necessarily identical to a lender's official payoff quote, which can include accrued interest and other applicable amounts.
Loan term is one of the most influential mortgage inputs. A shorter term spreads repayment across fewer installments, increasing the required monthly payment while generally reducing lifetime interest for the same loan amount and interest rate.
The following illustration uses the same hypothetical $240,000 loan and 6.5% fixed annual rate for both terms to isolate the effect of repayment length. Actual lender quotes for 15-year and 30-year loans may have different rates.
| Mortgage Detail | 15-Year Mortgage | 30-Year Mortgage |
|---|---|---|
| Loan Amount | $240,000 | $240,000 |
| Annual Interest Rate | 6.5% | 6.5% |
| Number of Payments | 180 | 360 |
| Monthly Principal and Interest | Approximately $2,090.66 | Approximately $1,516.96 |
| Total Lifetime Interest | Approximately $136,319 | Approximately $306,107 |
The 15-year mortgage requires a higher monthly payment but produces substantially less total interest in this example. The 30-year mortgage provides a lower required monthly payment and more monthly cash-flow flexibility, but the debt remains outstanding longer.
Compare both options using realistic lender-provided rates, rather than assuming both terms will receive identical pricing.
A higher home price generally increases the mortgage balance unless the down payment increases enough to offset it. A larger down payment reduces the amount financed and can lower the monthly principal-and-interest payment.
The down payment percentage may also affect mortgage insurance requirements, loan pricing, and available loan programs. However, a larger down payment uses more upfront cash, which should be considered alongside closing costs and emergency savings.
A higher interest rate increases the monthly principal-and-interest payment on the same fixed-rate mortgage. It also increases the total interest paid if the loan remains outstanding for the entire term.
Even a relatively small rate difference can affect borrowing costs over 15 or 30 years. When comparing lender offers, distinguish the stated interest rate from APR and evaluate applicable fees and loan terms.
Increasing the repayment term usually lowers the scheduled monthly payment but increases the number of payments. Shortening the term increases the required payment while reducing the period over which interest accrues.
Property taxes and homeowners insurance can materially change the monthly amount a homeowner needs to budget. They do not directly change the contractual principal-and-interest payment, but they can affect the amount collected each month through escrow.
Enter estimates appropriate to the specific property rather than assuming that every house with the same purchase price has identical tax and insurance costs.
Use the calculator to test how changes in mortgage interest rates affect the same loan. The following examples assume a $240,000 principal, a 30-year fixed term, equal monthly payments, and no additional principal payments.
| Annual Interest Rate | Estimated Monthly Principal and Interest |
|---|---|
| 5.0% | $1,288.37 |
| 5.5% | $1,362.69 |
| 6.0% | $1,438.92 |
| 6.5% | $1,516.96 |
| 7.0% | $1,596.73 |
In this example, increasing the rate from 6.0% to 7.0% raises the estimated monthly principal-and-interest payment by approximately $157.81. These rates are hypothetical comparison inputs, not current market quotes or forecasts.
To compare purchase options, keep the loan term and interest rate unchanged while modifying the home price or down payment. To compare financing offers, keep the loan amount and term constant and enter the actual quoted rate for each offer.
Mortgage estimates are most useful when their underlying assumptions match the financing being considered. A standard fixed-rate calculation typically assumes:
Closing costs: Appraisal charges, lender fees, title-related expenses, prepaid items, and other closing costs are not automatically reflected in a standard monthly payment calculation. If permitted costs are financed, they may increase the loan amount.
Mortgage insurance: PMI is generally associated with certain conventional loans, while FHA and other mortgage programs may have different insurance or guarantee-fee structures. Some charges may be paid upfront, monthly, or financed.
Adjustable rates: An ARM may have a fixed introductory rate followed by adjustments. The actual payment can rise or fall subject to the loan's adjustment rules and applicable caps. A standard fixed-rate estimate does not model those future changes.
Taxes and insurance: Annual costs can change because of reassessments, local tax changes, insurance renewal pricing, or coverage adjustments. Escrow estimates are not guaranteed future bills.
Interest calculations and rounding: Lenders may use specific payment dates, rounding practices, and servicing conventions. As a result, estimates can differ slightly from official loan disclosures or amortization schedules.
Affordability and approval: A calculated payment does not establish loan eligibility or determine how much a lender will approve. Credit history, income, existing debts, assets, property characteristics, underwriting standards, and loan program requirements may influence eligibility and pricing.
Enter your loan amount, annual mortgage interest rate, and repayment term into the Mortgage Calculator. For a fixed-rate mortgage, the calculator estimates the monthly principal-and-interest payment using a standard amortization formula. Add property taxes, insurance, and other applicable housing charges to estimate a broader monthly payment.
It depends on the interest rate and loan term. For example, a $300,000 loan at a hypothetical 6.5% fixed annual interest rate over 30 years has an estimated monthly principal-and-interest payment of $1,896.20. Property taxes, homeowners insurance, mortgage insurance, and HOA fees would be additional if applicable.
Yes, by modifying the interest rate you can get to see several possibilities of the loans and how a rate will influence your monthly installment and the final cost of the mortgage.
Some mortgage calculators enable you to incorporate estimated amounts for property taxes, homeowners’ insurance and mortgage insurance. When you factor these fees into the calculation, it helps to paint a truer picture of what your monthly mortgage obligation will look like.
Sure. I find that one of the best uses of the mortgage calculator is to play with it prior to meeting with a lender. It’ll give you a ballpark figure of what you may be able to afford, the costs associated with various loan packages, and to start working out what to include in your budget as you begin house hunting.
Yes. Home owners can examine their existing monthly mortgage payment to a new interest rate, loan amount, or repayment term on a refinance to determine the estimated amount they could save on a monthly basis.
Enter the expected amount, rate and term, calculate a base case, then increase the rate or shorten the term. Compare the monthly payment and total interest to understand the trade-off between cash flow and borrowing cost.
The mortgage interest rate directly affects your monthly payment and total borrowing cost. For a fixed-rate mortgage, the principal-and-interest payment generally remains unchanged throughout the loan term.
The following example compares a $300,000 mortgage with a 30-year repayment term at different hypothetical annual interest rates.
| Interest Rate | Monthly Payment | Approximate Total Interest |
|---|---|---|
| 4.0% | $1,432.25 | $215,609 |
| 5.0% | $1,610.46 | $279,767 |
| 6.0% | $1,798.65 | $347,515 |
| 7.0% | $1,995.91 | $418,527 |
| 8.0% | $2,201.29 | $492,465 |
These estimates exclude property taxes, homeowners insurance, mortgage insurance, and other fees. The interest rates are hypothetical examples, not current lender offers.
A difference of even one percentage point can materially affect monthly payments and lifetime interest costs. When comparing mortgages, use the actual interest rates quoted for your loan amount, credit profile, and repayment term.
A larger down payment reduces the amount borrowed and generally lowers the monthly principal-and-interest payment when the purchase price, interest rate, and loan term remain unchanged.
Consider a $350,000 home with a hypothetical 6.5% annual fixed interest rate and a 30-year mortgage.
| Down Payment | Mortgage Amount | Approximate Monthly Payment |
|---|---|---|
| 5% ($17,500) | $332,500 | $2,101.51 |
| 10% ($35,000) | $315,000 | $1,990.91 |
| 15% ($52,500) | $297,500 | $1,880.30 |
| 20% ($70,000) | $280,000 | $1,769.79 |
| 25% ($87,500) | $262,500 | $1,659.18 |
All payments represent estimated monthly principal and interest only. Actual loan pricing may vary with the down payment percentage, mortgage product, and borrower qualifications.
A down payment can also influence mortgage insurance requirements. Conventional loans with less than 20% down commonly require private mortgage insurance, while government-backed mortgage programs may follow different insurance rules.
With a standard fixed-rate mortgage, early monthly payments generally include a relatively large interest portion because the outstanding loan balance is highest near the beginning of repayment.
Consider a $240,000 mortgage at a hypothetical 6.5% annual interest rate with a 30-year repayment period.
Estimated Monthly Principal and Interest: $1,516.96
First Month Interest = $240,000 × (0.065 / 12) = $1,300.00
First Month Principal = $1,516.96 − $1,300.00 = Approximately $216.96
| Payment Component | Estimated Amount |
|---|---|
| Monthly Principal and Interest | $1,516.96 |
| Interest Portion | $1,300.00 |
| Principal Portion | $216.96 |
| Remaining Principal Balance | Approximately $239,783.04 |
As the principal decreases, the interest charged on the remaining balance generally falls. More of each scheduled payment then goes toward reducing principal.
This example assumes the standard monthly amortization convention. Actual mortgage servicing calculations may vary based on payment timing and loan terms.
A mortgage's principal-and-interest payment is not necessarily the same as the total amount a homeowner spends on housing each month.
Property taxes, homeowners insurance, mortgage insurance, and homeowners association fees can increase the amount required each month.
| Housing Expense | Included in Basic Mortgage Payment? |
|---|---|
| Mortgage Principal | Yes |
| Mortgage Interest | Yes |
| Property Taxes | No |
| Homeowners Insurance | No |
| Mortgage Insurance | No |
| HOA Fees | No |
| Home Maintenance | No |
| Utilities | No |
Some lenders collect property taxes and insurance through an escrow account. These amounts may be included in the monthly bill even though they are separate from the loan's principal-and-interest calculation.
For better budgeting, compare the estimated principal-and-interest payment with the expected total housing payment and separately budget for maintenance and other ownership expenses.
Paying additional money toward the principal of a mortgage can reduce the outstanding balance faster and potentially lower total interest costs.
For a standard fixed-rate mortgage, extra principal payments generally shorten the repayment period rather than automatically reducing the required monthly payment.
Adding an amount to each regular payment can accelerate repayment when the additional money is correctly applied to the outstanding principal.
A lump-sum principal payment reduces the outstanding loan balance. Future interest calculations then generally apply to the lower balance, subject to the loan's terms.
Some eligible mortgages allow borrowers to request a recast after making a substantial principal payment. A recast recalculates the required monthly payment using the reduced balance and remaining repayment term, generally without replacing the existing mortgage.
Recasting eligibility, fees, and minimum payment requirements depend on the lender or mortgage servicer.
Before making substantial extra payments, verify how the lender applies additional funds and whether any prepayment restrictions or charges apply.
For detailed early-repayment scenarios, a dedicated Mortgage Payoff Calculator provides a more appropriate calculation than a standard monthly payment estimator.
Two mortgages with identical loan amounts can have different total costs because of interest rates, discount points, origination charges, mortgage insurance, and other terms.
When comparing lender offers, evaluate the following information:
Start with the same mortgage amount and repayment term when comparing how interest rates affect monthly payments. Then review the actual quoted fees and other loan conditions separately.
A mortgage with a lower monthly payment may not have the lowest total borrowing cost, particularly if it involves a longer term or higher upfront charges.
A Mortgage Calculator can provide a mathematically reliable principal-and-interest estimate when the inputs match the assumptions of a standard fixed-rate, fully amortizing loan.
However, the calculated payment may differ from the actual lender payment because of differences in loan details, insurance premiums, taxes, escrow requirements, financed charges, and servicing conventions.
For more useful results, follow these steps:
A mortgage estimate does not guarantee an interest rate, loan approval, or future housing cost. Use the calculator to evaluate different borrowing scenarios and verify specific financing terms with your lender.
A mortgage estimate is useful before submitting a purchase offer because it helps translate a property's asking price into an expected monthly borrowing commitment.
Instead of evaluating only one purchase price, compare several realistic scenarios using the same down payment strategy and financing assumptions.
Enter the estimated home price, down payment, loan term, and expected interest rate for each property. Review how changes in the mortgage balance affect monthly principal and interest.
Consider calculating the payment at a rate slightly higher than an initial quote. This can show how sensitive your monthly budget is to changes in rates before the financing terms are finalized.
This scenario is particularly useful when a mortgage interest rate has not yet been locked.
Two properties with similar purchase prices may have different taxes, homeowners insurance premiums, and HOA charges. Use property-specific estimates whenever possible.
The required down payment is only one potential upfront expense. Buyers may also need cash for closing costs, prepaid charges, moving expenses, immediate repairs, and reserves.
The Mortgage Calculator helps estimate payments, but a complete purchase budget should also account for these additional expenses.
Recalculate your mortgage estimate whenever a material financing assumption changes. An updated calculation helps prevent comparisons based on outdated figures.
By updating these inputs individually, you can identify which changes have the greatest effect on your estimated monthly payment and total financing costs.