Mortgage Calculator
Estimate monthly mortgage payments, payoff timing, and how extra payments affect total interest.
Mortgage Summary
Principal-and-interest estimate based on your inputs
Enter mortgage details to see your payment estimate.
What This Includes
This v1 estimate is focused on principal and interest.
Included: loan amount, monthly payment, payoff date, amortization schedule, and extra-payment savings.
Not included: escrow, PMI, HOA, homeowners insurance, taxes, refinance scenarios, or adjustable-rate loans.
Amortization Schedule
Payment-by-payment breakdown of principal, interest, and remaining balance.
| Year | Total Paid | Principal | Interest | Balance | |
|---|---|---|---|---|---|
| Enter mortgage details to see the amortization schedule. | |||||
How To Read the Mortgage Estimate
Use the payment result as a planning baseline, then layer in the housing costs this version intentionally leaves outside the principal-and-interest model.
Loan amount comes first
The payment estimate starts with home price minus down payment. If your real transaction rolls in financed fees, points, or seller credits that change the amount borrowed, adjust the starting loan amount before using the monthly result as a decision number.
Monthly payment uses fixed-rate amortization
The calculator uses a standard amortization formula for a fixed-rate mortgage. That gives you the principal-and-interest payment, payoff timing, and interest breakdown for every scheduled payment across the full term.
Extra payments are treated as extra principal
Additional monthly contributions are applied to principal so you can see time saved and interest saved. This is useful for testing whether a faster payoff creates more value than keeping that cash available for other priorities.
Mortgage Decision Guide
The right mortgage scenario is usually the one that balances affordability, resilience, and speed, not simply the lowest quoted rate.
Down Payment vs. Cash Reserves
A bigger down payment can lower the monthly payment and reduce total interest, but leaving yourself house-poor is a real risk. Test the payment against a scenario that preserves emergency savings, moving costs, and the first year of maintenance.
30-Year Flexibility vs. 15-Year Speed
A shorter term can build equity faster and cut interest dramatically, but it also raises the required payment. If your income is uneven or you value optionality, a longer term plus voluntary extra payments may be the safer operating model.
Mortgage Savings vs. Other Goals
Compare extra mortgage payments against higher-interest debt, retirement match opportunities, and near-term savings goals. The cheapest financing path is not always the best household cash-management decision.
If you want to compare a broader borrowing scenario, review the loan calculator for non-mortgage amortization and the paycheck calculator to pressure-test the payment against estimated take-home pay.
Mortgage FAQ
Common planning questions that come up once the payment estimate looks realistic.
Why is this payment lower than a lender quote?
This mortgage calculator models principal and interest plus optional extra principal payments. Lender quotes often include property taxes, homeowners insurance, PMI, HOA dues, prepaid interest, and closing-cost assumptions that are not part of this v1 estimate.
Should I choose a shorter term or make extra payments?
A shorter term usually lowers total interest but locks you into a higher required payment. Extra principal keeps more flexibility because you can stop or reduce the extra payment later. Compare monthly obligation, time saved, and total interest saved before deciding.
How much down payment should I test?
Run at least three scenarios: your minimum cash-to-close option, the down payment that keeps healthy reserves after closing, and the level that may remove PMI. The best answer is the one that balances monthly affordability, total borrowing cost, and post-close cash flexibility.
Does this calculator handle ARM or refinance scenarios?
No. This page is designed for fixed-rate purchase planning. Adjustable-rate loans, refinance costs, cash-out math, and escrow analysis need separate modeling before you make a final decision.