Free biweekly mortgage calculator
Switch from monthly to biweekly mortgage payments and see how much interest you save and how many years you shave off, updated live, as you type.
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Savings shown vs. standard monthly payment. Verify biweekly payment option with your lender — not all servicers accept it directly.
Results are estimates. Consult a professional.
How the biweekly mortgage calculator works
A biweekly mortgage payment plan splits your normal monthly payment in half and schedules a payment every two weeks. Because there are 52 weeks in a year, this results in 26 half-payments — the equivalent of 13 full monthly payments instead of the usual 12. That extra payment goes entirely toward principal, shrinking the balance faster and reducing the total interest charged.
The compounding benefit is multiplicative: each early principal reduction lowers the balance on which next period's interest is charged, which in turn means more of each subsequent payment goes to principal. On a 30-year loan, this cascading effect typically cuts 4–6 years off the payoff timeline and saves tens of thousands of dollars in interest.
Consumer Financial Protection Bureau — Making extra mortgage payments.Worked example: $350,000 loan at 7% over 30 years
Borrower has a $350,000 mortgage at 7.0% APR on a standard 30-year term. We compare total cost under monthly vs biweekly payment schedules.
Biweekly vs monthly: years saved and interest saved
All examples assume a standard 30-year fixed-rate mortgage with payments applied immediately to principal. Savings increase with higher loan amounts and higher rates.
| Loan Amount | Rate | Monthly Payment | Biweekly Pymt | Years Saved | Interest Saved |
|---|---|---|---|---|---|
| $200,000 | 6% | $1,199 | $600 | 4.3 yrs | $24,600 |
| $200,000 | 7% | $1,331 | $666 | 4.5 yrs | $29,700 |
| $300,000 | 6% | $1,799 | $900 | 4.3 yrs | $36,900 |
| $300,000 | 7% | $1,996 | $998 | 4.5 yrs | $44,500 |
| $400,000 | 7% | $2,661 | $1,331 | 4.5 yrs | $59,300 |
| $500,000 | 8% | $3,669 | $1,835 | 4.8 yrs | $88,200 |
Source: Consumer Financial Protection Bureau mortgage payment guidance; standard amortization model.
Tips for setting up a biweekly mortgage payment plan
The savings from biweekly payments are real, but the execution details matter a great deal. Follow these five steps to get the full benefit without paying unnecessary fees.
- Confirm your lender applies payments immediately — Some servicers hold biweekly payments until a full monthly amount accumulates, then apply it on the due date. This eliminates the interest benefit. Ask explicitly: 'Do you apply each biweekly payment the day it is received?'
- Avoid third-party biweekly programs — Companies charge $300–$500 setup fees plus monthly fees to manage biweekly payments on your behalf. You can get identical results by making one extra principal payment per year on your own — free of charge.
- Label extra payments as principal-only — When making the 13th equivalent payment, mark it explicitly as 'apply to principal.' Without this instruction, servicers may apply it to future interest or escrow.
- Check for prepayment penalties — Rare on conventional loans but worth verifying in your loan documents. Some non-QM and older loans include prepayment penalty clauses that reduce or eliminate the benefit.
- Sync payments with your paycheck schedule — Biweekly payments align naturally with biweekly paychecks, making budgeting easier. If you are paid monthly or semi-monthly, consider setting aside 1/12 of an extra payment each month instead.
Accuracy and limitations
This calculator models a simple scenario where each biweekly payment is applied to the loan balance immediately upon receipt, reducing the principal before the next interest calculation. Real-world results depend on your servicer's payment application rules, which vary. The calculator does not account for taxes, insurance, PMI, escrow adjustments, rate changes (for ARMs), or fees. Payoff dates are estimates — minor differences in application timing can shift results by a few months.
Not financial advice — consult a mortgage professional for your specific situation.
Biweekly mortgage terms defined
About this biweekly mortgage calculator
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