Biweekly Mortgage Calculator: Payments & Interest Savings
Compare regular monthly mortgage payments with an accelerated plan that pays half the monthly amount every two weeks. Estimate the difference in interest and repayment duration under a stated periodic model.
Compare monthly and biweekly payments
Enter the principal, fixed nominal annual interest rate, and monthly repayment term. For an existing loan, use its current principal balance and remaining term. This is a principal-and-interest illustration, not a lender payoff quote.
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Accelerated payment every two weeks
- Estimated interest saved
- Estimated time saved
| Measure | Monthly | Every two weeks |
|---|---|---|
| Regular payment | ||
| Payments to payoff | ||
| Total interest | ||
| Total repaid | ||
| Last payment | ||
| Scheduled full-year outlay |
Payments and balances retain full precision during the calculation. Displayed money is rounded independently to cents. The final payment may be smaller. Full-year outlay means 12 regular monthly payments or 26 regular half-payments before payoff; it excludes the partial final year.
Time saved compares monthly payment count / 12 with biweekly payment count / 26. It is approximate model time, not an exact calendar payoff date.
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For examples and lender-crediting considerations, read our guide to how biweekly mortgage payments work.
How accelerated biweekly mortgage payments work
The model first calculates the monthly payment for a fixed-rate, fully amortizing loan. It then uses half that payment in each of 26 periods per year. That equals 13 monthly-payment amounts over a full model year, compared with 12 on the monthly plan.
This is different from splitting a monthly payment into two installments per month: 24 half-payments equal only 12 monthly payments. Actual every-14-day calendars may occasionally contain 27 payment dates in a year; this model always uses 26 equal periods.
How interest is calculated here
Monthly payment = P x i / (1 - (1 + i)^(-N)), where P is principal, i is the nominal annual rate divided by 12, and N is the term in months. At 0%, monthly payment is principal divided by N.
The comparison applies interest to the outstanding balance at the end of each period before subtracting the payment. Monthly interest uses the nominal annual rate divided by 12; biweekly interest uses the same nominal rate divided by 26. These conventions have slightly different effective annual yields. The comparison includes both that convention difference and the accelerated payment amount.
Check how your lender handles partial payments
A lender may hold half-payments until a full monthly payment is available, calculate daily interest, round scheduled payments to cents, charge fees, or apply extra funds differently. Those rules can change the savings. Confirm when money is credited to principal, any prepayment restrictions, and the treatment of escrow before using this illustration for a decision.
Frequently asked questions
Does this include taxes, insurance, or PMI?
No. Only principal and interest are modeled. Property taxes, insurance, mortgage insurance, escrow, fees, penalties, and rate changes are excluded.
Does the tool use my current contractual monthly payment?
No. It calculates a new theoretical monthly payment from your balance, rate, and whole-year term. For an existing loan, a different remaining term or lender convention can produce a different payment.
What happens at 0%?
There is no interest to save, but the higher annual payment amount can still reduce repayment time.
Does a biweekly plan guarantee these savings?
No. Actual dates, crediting policies, fees, rounding, and loan terms determine real results. This is a standardized mathematical comparison.
What input limits apply?
Principal must be positive and no more than $100 million, with up to two decimal places. The nominal annual rate can be 0% to 30%, with four decimal places. The monthly repayment term must be a whole number from 1 to 50 years.
For a monthly-only estimate, use our Mortgage Payment Calculator.
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