Mortgage Calculator – Estimate Your Monthly Home Payment
Use our Mortgage Calculator to estimate your monthly mortgage payment based on the home price, down payment, interest rate, and loan term. You can also include optional housing costs such as property taxes, homeowners insurance, PMI, and HOA fees to get a more complete estimate of your monthly housing expense.
The calculator also shows your loan amount, monthly principal and interest, total interest paid, total principal and interest, loan-term comparison, remaining mortgage balance, and year-by-year amortization.
This makes it useful for home buyers who want to understand both the monthly payment and the long-term cost of a mortgage before making a decision.
This calculator provides an estimate based on the values you enter. Actual mortgage payments may differ because of lender fees, escrow requirements, taxes, insurance costs, mortgage insurance rules, rate changes before closing, and other loan-specific factors.
What Is a Mortgage Calculator?
A mortgage calculator estimates the monthly payment on a home loan.
The basic calculation uses four main pieces of information:
Home Price
Down Payment
Interest Rate
Loan Term
The calculator first determines how much money you need to borrow.
For example, if a home costs:
$400,000
and you make a:
$80,000 down payment
your estimated loan amount is:
$320,000
The calculator then applies the interest rate and loan term to estimate your monthly principal-and-interest payment.
How to Use the Mortgage Calculator
Start by entering the price of the home you are considering.
Then enter your down payment either as a dollar amount or percentage. The calculator automatically calculates the corresponding value so you can work with whichever format is easier.
Next, enter the annual interest rate you want to test and choose a common mortgage term such as:
15 years
20 years
or:
30 years
You can also enter a custom loan term.
The calculator will immediately estimate the monthly payment and show how much of the home price is being financed.
How Is the Loan Amount Calculated?
The mortgage loan amount is:
Loan Amount = Home Price − Down Payment
For example:
Home price:
$500,000
Down payment:
$100,000
Loan amount:
$400,000
The loan amount is the principal used in the mortgage-payment calculation.
Mortgage Payment Formula
For a fixed-rate mortgage, the standard principal-and-interest formula is:
M = P × [r(1 + r)^n] ÷ [(1 + r)^n − 1]
Where:
M = monthly principal-and-interest payment
P = loan principal
r = monthly interest rate
n = total number of monthly payments
The monthly interest rate is calculated by dividing the annual rate by 12.
For example, if the annual interest rate is:
6%
the monthly rate is:
6% ÷ 12 = 0.5%
A 30-year mortgage has:
30 × 12 = 360 payments
The calculator performs these calculations automatically.
Mortgage Calculation Example
Suppose you are considering a:
$400,000 home
with a:
$80,000 down payment
The loan amount is:
$320,000
Assume an annual interest rate of:
6.5%
and a loan term of:
30 years
The calculator uses the mortgage formula to estimate the monthly principal-and-interest payment.
Optional property taxes, insurance, PMI, and HOA costs can then be added to estimate the broader monthly housing payment.
Principal and Interest Explained
A mortgage payment is typically made up of both principal and interest.
The principal is the amount you borrowed.
Interest is the cost of borrowing that money.
With an amortizing fixed-rate mortgage, the monthly principal-and-interest payment generally remains constant, but the balance between principal and interest changes over time.
Early in the mortgage, a larger portion of each payment usually goes toward interest.
Later in the loan, more of each payment goes toward principal.
The amortization schedule in the calculator shows this change year by year.
Mortgage Calculator With Down Payment
Your down payment directly affects the amount you borrow.
Suppose a home costs:
$300,000
If you put down:
10%
your down payment is:
$30,000
and the loan amount is:
$270,000
If you instead put down:
20%
your down payment becomes:
$60,000
and your loan amount falls to:
$240,000
A smaller loan amount generally produces a lower principal-and-interest payment when the interest rate and term stay the same.
The calculator lets you enter the down payment as either an amount or percentage and automatically keeps the two values connected.
Mortgage Calculator With Property Taxes
Property taxes can make a significant difference to your monthly housing cost.
The calculator lets you enter the annual property-tax amount.
It then converts that annual amount into a monthly estimate:
Monthly Property Tax = Annual Property Tax ÷ 12
For example:
Annual property tax:
$6,000
Monthly estimate:
$500
That monthly amount is added to the estimated mortgage payment when you use the optional housing-cost section.
Property-tax rates vary by location and property, so use the amount that best reflects the home you are evaluating.
Mortgage Calculator With Homeowners Insurance
Homeowners insurance is another common housing expense.
Enter the estimated annual insurance premium, and the calculator divides it by 12.
For example:
Annual insurance:
$1,800
Monthly insurance:
$150
This amount can then be included in the estimated total monthly housing payment.
Actual insurance premiums depend on the property, coverage level, insurer, location, deductible, and other factors.
Mortgage Calculator With PMI
Private mortgage insurance, or PMI, may apply to some conventional mortgages, particularly when the down payment is below certain thresholds.
Because the actual PMI cost depends on the lender, loan program, borrower profile, and loan-to-value ratio, this calculator does not invent a PMI amount.
Instead, you can enter the monthly PMI estimate yourself.
For example:
Monthly principal and interest:
$2,000
Monthly PMI:
$120
The calculator can include the PMI amount in the broader estimated monthly payment.
This gives you control over the assumption rather than presenting an estimated premium as if it were guaranteed.
Mortgage Calculator With HOA Fees
Some properties have homeowners association fees.
These fees may apply to condominiums, planned communities, townhomes, and some other residential properties.
If the property has an HOA fee, enter the monthly amount.
For example:
Monthly HOA fee:
$250
The calculator adds that amount to the estimated monthly housing cost.
HOA fees are separate from the mortgage loan itself, but they can still affect the amount you need to budget each month.
Estimated Monthly Mortgage Payment
The largest result in the calculator is the:
Estimated Monthly Payment
When optional housing costs are zero, this is essentially the monthly principal-and-interest payment.
When you enter property taxes, homeowners insurance, PMI, or HOA fees, the estimated monthly payment becomes:
Principal & Interest + Property Tax + Insurance + PMI + HOA
This distinction is important because the mortgage loan payment and the overall monthly housing expense are not always the same thing.
Monthly Principal and Interest
The Monthly P&I result shows only the payment associated with repaying the mortgage principal and interest.
It does not automatically include:
property taxes, homeowners insurance, PMI, or HOA fees.
This value is useful when comparing mortgage terms or loan offers because it isolates the financing portion of the payment.
Total Interest on a Mortgage
The calculator also estimates the total interest paid over the full mortgage term.
The basic calculation is:
Total Interest = Total Principal-and-Interest Payments − Original Loan Amount
For example, if you borrow:
$300,000
and the sum of all principal-and-interest payments over the loan equals:
$650,000
then estimated total interest is:
$350,000
The actual amount depends heavily on the interest rate and loan term.
Why Mortgage Term Matters
The loan term determines how long you have to repay the mortgage.
Common fixed-rate terms include:
15 years
20 years
and:
30 years
A shorter term usually produces a higher monthly payment because the loan must be repaid more quickly.
However, a shorter term generally results in less total interest if the loan amount and rate remain the same.
A longer term usually lowers the required monthly principal-and-interest payment, but interest has more time to accumulate.
15-Year vs. 30-Year Mortgage
The calculator includes a loan-term comparison so you can see how the same loan amount and interest rate behave with different terms.
Suppose you borrow:
$300,000
at the same interest rate.
A 15-year loan requires repayment over:
180 monthly payments
A 30-year loan spreads repayment across:
360 monthly payments
The 15-year payment will normally be higher, but the total interest cost will generally be lower.
The 30-year payment will generally be lower each month, but the longer repayment period can result in substantially more total interest.
The comparison table lets you see both values side by side.
What Is Mortgage Amortization?
Mortgage amortization is the process of gradually paying down a loan through scheduled payments.
Each monthly principal-and-interest payment contains:
Interest
and:
Principal repayment
The interest portion is calculated from the outstanding loan balance.
As the balance decreases, the amount of interest charged generally decreases too.
This means that over time, an increasing portion of the fixed payment can go toward principal.
Year-by-Year Mortgage Amortization
The calculator provides a year-by-year amortization schedule rather than immediately showing hundreds of monthly rows.
For each year, you can see:
Principal Paid
Interest Paid
and:
Remaining Balance
This makes it easier to understand how quickly the mortgage balance is falling and how the principal-versus-interest relationship changes over time.
Remaining Mortgage Balance
The balance chart shows how the principal owed declines across the mortgage term.
At the start of the loan, the remaining balance is close to the original loan amount.
As scheduled payments are made, the balance decreases.
At the end of a fully amortizing mortgage term, the remaining principal reaches approximately:
$0
The chart provides a quick visual explanation of the amortization process.
How Interest Rate Affects a Mortgage Payment
The interest rate has a direct impact on the monthly mortgage payment.
Consider the same:
$300,000 loan
with the same loan term.
A lower interest rate generally creates a lower monthly principal-and-interest payment.
A higher interest rate generally creates a higher monthly payment and increases the amount of interest paid over the life of the loan.
Even relatively small differences in mortgage rates can have a noticeable effect over a long repayment period.
That is why the calculator allows decimal interest rates such as:
6.25%
6.375%
or:
6.75%
What Happens With a 0% Interest Rate?
A 0% rate is mathematically valid.
In that case, no interest is charged.
The calculation becomes:
Monthly Payment = Loan Amount ÷ Number of Monthly Payments
For example:
Loan amount:
$120,000
Term:
10 years
Number of payments:
120
Monthly payment:
$1,000
The calculator handles this case separately so the standard mortgage formula does not produce a division error.
How Down Payment Affects Your Mortgage
A larger down payment reduces the amount financed.
For example, on a:
$400,000 home
with 10% down:
Down payment = $40,000
Loan amount = $360,000
With 20% down:
Down payment = $80,000
Loan amount = $320,000
That difference reduces the amount on which mortgage interest is calculated.
A larger down payment may also affect mortgage-insurance requirements depending on the specific loan, but those rules vary, which is why PMI remains a separate user-entered value in this calculator.
What Does the Total Principal + Interest Result Mean?
The Total Principal + Interest result is the sum of all scheduled principal-and-interest payments over the selected loan term.
It does not include optional housing costs such as property taxes, homeowners insurance, PMI, or HOA fees.
Those expenses may change over time and are not part of the mortgage principal itself.
Keeping these totals separate makes it easier to understand the true cost of the loan versus other homeownership expenses.
Mortgage Payment Example With Housing Costs
Suppose your estimated monthly principal-and-interest payment is:
$2,100
and you enter:
Property tax:
$500 per month
Homeowners insurance:
$150 per month
PMI:
$100 per month
HOA:
$200 per month
Estimated total monthly housing payment:
$2,100 + $500 + $150 + $100 + $200
= $3,050
This broader estimate can be more useful for budgeting than looking at principal and interest alone.
Home Price vs. Loan Amount
The home price and mortgage loan amount are not always the same.
If a home costs:
$450,000
and you make a:
$90,000 down payment
you are not borrowing $450,000.
Your mortgage principal is:
$360,000
This is why the calculator displays the loan amount separately from the purchase price.
Does the Mortgage Calculator Include Closing Costs?
No.
Closing costs are not automatically included in this mortgage-payment calculation.
Closing costs may include expenses such as lender fees, title charges, appraisal costs, prepaid items, recording fees, and other transaction-specific costs.
Those costs are better handled separately because they are not necessarily part of the monthly mortgage payment.
Does the Calculator Estimate How Much House I Can Afford?
No.
This calculator estimates payments for a home price and loan assumptions that you enter.
A true mortgage-affordability calculation usually considers additional information such as:
income, recurring debts, debt-to-income ratio, available cash, and lender qualification rules.
Those factors represent a different calculation and should not be confused with a mortgage-payment estimate.
Does the Calculator Use Current Mortgage Rates?
No automatic live mortgage rate is inserted.
You enter the rate you want to evaluate.
This is useful because the actual interest rate offered to a borrower can depend on many factors, including the lender, loan product, credit profile, points, property type, loan size, and market conditions.
If you have a quoted rate, entering that rate will provide a more relevant estimate than using a generic rate.
Can I Use the Mortgage Calculator for Different Currencies?
Yes.
The mortgage formula is based on numbers and percentages, so the same calculation works with different currencies.
You can change the displayed currency symbol to options such as:
$
€
£
₹
or:
₨
Changing the symbol does not change the mortgage formula.
Common Mortgage Calculation Mistakes
A common mistake is using the full home price as the loan amount even when a down payment is being made.
Another is looking only at principal and interest and forgetting about recurring housing expenses such as property taxes, homeowners insurance, PMI, or HOA fees.
It is also easy to assume that a lower monthly payment automatically means the cheaper loan. A longer mortgage term may reduce the monthly payment but increase the amount of interest paid over time.
The calculator separates these values so you can review the monthly payment and long-term loan cost independently.
Frequently Asked Questions
How do I calculate a mortgage payment?
Subtract the down payment from the home price to determine the loan amount, then use the loan principal, monthly interest rate, and total number of payments in the standard fixed-rate mortgage formula.
What is included in monthly principal and interest?
It includes repayment of the mortgage principal plus interest charged by the lender. It does not automatically include property taxes, homeowners insurance, PMI, or HOA fees.
How do I calculate the loan amount?
Use:
Loan Amount = Home Price − Down Payment
Does a bigger down payment lower the mortgage payment?
If the interest rate and term remain the same, a larger down payment lowers the amount borrowed and therefore generally lowers the principal-and-interest payment.
Does a 15-year mortgage cost less than a 30-year mortgage?
A 15-year mortgage generally has a higher monthly payment but may result in less total interest than a 30-year mortgage using the same principal and rate.
What does PMI mean?
PMI stands for private mortgage insurance. It may apply to certain mortgage loans, depending on the loan structure and lender requirements.
Are property taxes included?
Only if you enter an annual property-tax amount in the optional housing-cost section.
Is homeowners insurance included?
Only if you enter the annual premium.
Are HOA fees included?
Only when you enter a monthly HOA amount.
Does the calculator include mortgage closing costs?
No. Closing costs are not included unless they are separately incorporated into the loan amount before using the calculator.
What is an amortization schedule?
An amortization schedule shows how scheduled mortgage payments are divided between principal and interest and how the remaining loan balance changes over time.
Is this mortgage payment guaranteed?
No. It is an estimate based on the values entered. Your lender's actual calculation, escrow amounts, fees, insurance, taxes, and mortgage terms may differ.
Estimate Your Mortgage Payment
Use the Mortgage Calculator to understand how home price, down payment, interest rate, and loan term affect your estimated payment.
Start with the basic mortgage details to see your monthly principal and interest, then add property taxes, insurance, PMI, and HOA fees if you want a broader monthly housing-cost estimate.
The calculator also helps you review the long-term side of the loan by showing total interest, total principal and interest, term comparisons, remaining balance, and year-by-year amortization.