Calculator inputs
The form uses a three-column layout on large screens, two columns on smaller screens, and one column on mobile devices.
Example data table
This sample uses the default values currently loaded in the calculator.
| Home Price | Down Payment | Rate | Term | Mode | Extra Payment | Base Biweekly P&I | Total Interest | Payoff Date |
|---|---|---|---|---|---|---|---|---|
| $350,000.00 | $70,000.00 | 6.75% | 30 years | Accelerated biweekly | $100.00 | $908.04 | $216,478.30 | 2045-03-05 |
Formula used
Loan Amount = Home Price − Down Payment
Biweekly Rate = Annual Interest Rate ÷ 26
Monthly Rate = Annual Interest Rate ÷ 12
Payment = P × r ÷ (1 − (1 + r)−n)
Where P = principal, r = periodic rate, and n = total periods.
Accelerated Biweekly P&I = Monthly P&I ÷ 2
Escrow = Property Tax ÷ 26 + Insurance ÷ 26 + (HOA × 12) ÷ 26 + PMI
PMI per period = Current Balance × PMI Rate ÷ 26
PMI is included while Loan-to-Value stays above 80%.
Total Payment = Scheduled P&I + Extra Principal + Escrow
How to use this calculator
- Enter the home price and down payment.
- Choose whether the down payment is a percent or amount.
- Fill in the interest rate, term, and first payment date.
- Select standard biweekly or accelerated biweekly mode.
- Add optional extra principal for faster payoff.
- Include taxes, insurance, HOA, PMI, and closing costs if needed.
- Press the calculate button to show results above the form.
- Review the summary, chart, and amortization schedule.
- Download the schedule as CSV or export the report as PDF.
FAQs
1. What is a biweekly mortgage payment?
A biweekly mortgage plan splits payments into 26 installments each year. Because there are 26 biweekly periods, you effectively make the equivalent of 13 monthly halves in an accelerated setup.
2. What is the difference between standard and accelerated biweekly?
Standard biweekly uses a payment calculated directly over 26 periods yearly. Accelerated biweekly uses half of the normal monthly payment, which creates one extra monthly payment each year and usually saves more interest.
3. Does biweekly always save interest?
Accelerated biweekly usually saves noticeable interest because principal declines faster. Standard biweekly may also help, but the amount depends on rate assumptions, loan structure, and whether extra principal is added.
4. Why does escrow change the total payment?
Escrow adds non-loan housing costs like property tax, insurance, HOA charges, and PMI. These amounts do not reduce principal, but they affect how much cash you pay every period.
5. Why can PMI disappear during the schedule?
PMI is commonly removed once the balance drops to a lower loan-to-value level. This calculator stops PMI when the balance reaches 80% of the entered home price.
6. Should I enter closing costs here?
Yes, when you want a broader cash-to-close view. Closing costs do not change the amortization balance in this version, but they are shown in the summary for planning.
7. Can extra principal shorten the term a lot?
Yes. Even small recurring extra payments can reduce lifetime interest and move the payoff date earlier because more of each installment goes directly toward principal.
8. Is this calculator suitable for every lender?
It is a strong planning tool, but lenders may use different compounding, escrow handling, and PMI rules. Confirm final figures against your lender’s official amortization schedule.