Mortgage Calculator

Estimate your monthly mortgage payment, taxes, insurance, PMI, HOA fees and total interest.

Your inputs

Loan amount ($)

Interest rate (%)

Loan term (years)

Property tax / year ($)

Home insurance / year ($)

HOA / month ($)

PMI / month ($)

Estimated monthly payment

—

Principal & interest—

Property tax—

Home insurance—

HOA + PMI—

Estimated lifetime interest—

Estimated lifetime outflow—

Month	Payment	Principal	Interest	Balance

Showing the first 12 scheduled payments.

How this calculator works

Monthly principal and interest for a fixed-rate mortgage uses the standard amortizing-loan payment formula. Taxes, insurance, HOA and PMI are added separately.

For amortizing loans, the core payment formula is Payment = P × r × (1+r)^n ÷ ((1+r)^n − 1), where P is principal, r is the periodic interest rate and n is the number of payments.

Last reviewed: September 2026. Estimates are for educational and planning purposes only.

How to use the result

Change one assumption at a time to compare scenarios. For example, test a lower rate, larger contribution, different term or extra payment. This makes the calculator most useful as a decision-support tool rather than a single-number answer.

Important financial decisions can depend on taxes, fees, eligibility rules, lender policies, market returns and personal circumstances that this simplified calculator does not capture.

Frequently asked questions

Is this mortgage calculator free?

Yes. SumStride calculators are free to use and do not require an account.

Are the results exact?

No. Results are estimates based on the values you enter and the assumptions described on this page. Real-world fees, taxes, rates, policies and timing can differ.

Does SumStride save my inputs?

No account is required. The calculator runs in your browser; SumStride does not need your entered values to perform the calculation.