A mortgage payment is more than principal and interest. Property taxes, homeowners insurance, mortgage insurance and HOA dues can materially change the monthly housing cost, while extra principal can change how long the loan remains outstanding.
Mortgage Calculator
| Month | Scheduled P&I | Extra principal | Principal | Interest | Ending balance |
|---|
Educational planning estimate only. Actual mortgage payments can differ because of lender calculations, escrow changes, mortgage-insurance terms, variable taxes or insurance, fees and loan-program rules. Review the Loan Estimate and loan documents for actual terms.
How to Use the Mortgage Calculator
Enter the home price and edit either down-payment field; the dollar amount and percentage update together. Add the mortgage note rate and whole-year loan term.
Property taxes and homeowners insurance are entered as annual amounts. Mortgage insurance and HOA dues use monthly amounts and can be left blank when they do not apply.
Extra principal is optional. Leaving it blank models the scheduled mortgage only; entering an amount creates a second payoff path without changing the contractual principal-and-interest payment.
What the Main Results Mean
Estimated monthly housing cost combines scheduled principal and interest with the property taxes, homeowners insurance, mortgage insurance and HOA dues entered.
Monthly principal and interest is the fixed scheduled loan payment produced by the home price, down payment, note rate and term.
Mortgage review then shows the loan amount, total scheduled interest, non-principal-and-interest housing costs and the modeled impact of optional extra principal.
How the Mortgage Payment Is Calculated
A fixed-rate mortgage uses the standard amortization formula:
- P = mortgage principal
- r = monthly interest rate
- n = number of scheduled monthly payments
Monthly rate equals the annual mortgage interest rate divided by 12. At 0% interest, principal is divided evenly across the scheduled payments.
Annual property taxes and homeowners insurance are divided by 12. Monthly mortgage insurance and HOA dues are added directly to create the broader housing-cost estimate.
Use the Mortgage Interest Rate, Not APR
The note rate is the percentage used to calculate mortgage interest. APR is broader because it also reflects certain points, broker fees and other borrowing charges.
Entering APR in the payment formula can therefore overstate scheduled principal and interest. On a Loan Estimate, the interest rate appears under Loan Terms on page 1 while APR appears in the Comparisons section on page 3.
Taxes, Insurance and HOA Can Change the Monthly Budget
Principal and interest often make up the largest part of a mortgage payment, but they do not represent the full cost of carrying the home. Taxes, homeowners insurance and mortgage insurance may be collected through escrow, while HOA dues are often paid separately.
The calculator combines those costs for budgeting even when the lender does not collect every item in one payment. Actual escrow amounts can change as taxes and insurance premiums change.
Use property-specific estimates whenever possible. Two homes with the same purchase price and loan terms can have meaningfully different monthly housing costs because of taxes, insurance or association dues.
Mortgage Insurance Is an Input, Not a Universal Estimate
Mortgage insurance is entered manually rather than generated from a generic PMI percentage. Actual premiums depend on the mortgage type, loan-to-value ratio and borrower or program characteristics.
For many conventional mortgages, borrower-requested PMI cancellation can become available when the principal balance is scheduled to reach 80% of the home’s original value, subject to applicable requirements. Automatic termination generally occurs at 78% when the loan is current.
FHA, VA and other structures can follow different rules, so the calculator does not predict a mortgage-insurance cancellation date. Enter the lender’s monthly estimate when insurance applies and leave the field blank when it does not.
Extra Principal Changes Interest and Payoff Time
Additional principal reduces the outstanding balance faster while leaving the scheduled fixed-rate payment unchanged. The calculator compares the standard amortization schedule with a second schedule that adds the entered extra amount each month.
Interest savings come from carrying a smaller balance for fewer months. A $200 recurring extra payment can have a much larger lifetime effect on a long mortgage than the same amount applied only occasionally.
The amortization schedule shows scheduled principal and interest, extra principal, total principal applied, interest and ending balance for each modeled month. CSV export is retained because a long mortgage schedule can contain hundreds of rows and may be useful outside the page.
Down Payment and Cash Needs Are Separate Decisions
A larger down payment lowers the mortgage principal and usually reduces scheduled principal and interest at the same rate and term. It may also affect mortgage-insurance requirements and pricing.
Cash needed to buy a home extends beyond the down payment. Closing costs, prepaid taxes and insurance, moving expenses and reserves are outside the calculator’s monthly mortgage result.
A known home price belongs in this payment calculator. Buyers still deciding how much home fits their income and debts can use the home affordability calculator for that separate question.
What the Calculator Does Not Model
Scheduled mortgage modeling assumes a fixed interest rate and level principal-and-interest payment. Adjustable-rate resets, temporary buydowns, interest-only periods, balloon payments and loan recasts are outside the model.
Property taxes, homeowners insurance, mortgage insurance and HOA dues remain constant at the amounts entered even though real costs can change. Closing costs, lender fees, discount points and cash reserves are also excluded.
Use the result as a planning estimate and compare it with the Loan Estimate and other lender disclosures for the specific mortgage.
Frequently Asked Questions (FAQs)
Should I enter mortgage APR or interest rate?
Enter the mortgage note rate. APR includes certain borrowing costs in addition to interest and is not the rate used directly in the standard principal-and-interest formula.
Does the monthly housing cost include taxes and insurance?
Yes, when those amounts are entered. Annual property taxes and homeowners insurance are divided by 12 and added to scheduled principal and interest.
Does the calculator automatically estimate PMI?
Mortgage insurance is not estimated automatically. Enter the monthly amount that applies to the scenario, or leave the field blank when none is expected.
Does extra principal lower my required payment?
Extra principal is modeled as an additional payment that shortens the payoff and reduces interest while leaving the scheduled payment unchanged.
Why can the actual mortgage payment change?
Escrowed taxes and insurance can change even when principal and interest stay fixed. Mortgage-insurance terms can also affect the amount due.
Does the calculator include closing costs?
Closing costs are excluded from the ongoing monthly housing-cost estimate. Other cash-to-close items are separate as well.