Biweekly Payment Calculator
See how switching to biweekly mortgage payments quietly adds one extra payment a year and shaves years off your loan.
By Onias Derilus, Mortgage Capital · NMLS# 1859012 · Last Updated: June 2026
Paying half your payment every two weeks results in 26 half-payments — equal to 13 monthly payments a year. The extra payment shortens the loan. Estimate only.
A biweekly plan splits your monthly payment in half and pays it every two weeks. Because there are 52 weeks in a year, you make 26 half-payments — the equivalent of 13 full monthly payments instead of 12.
That one extra payment a year goes straight to principal, which shortens the loan and cuts total interest, often without you feeling much difference month to month.
How to Use This Calculator
- 1
Enter your loan amount, rate, and term.
- 2
Review the standard monthly payment and the biweekly half-payment.
- 3
See how many years come off the loan from the built-in extra payment.
- 4
Compare the interest saved to decide whether biweekly fits your cash flow.
The Formula & Assumptions
Biweekly = monthly payment ÷ 2
26 biweekly = 13 monthly per year
Effective monthly =
monthly × 13 ÷ 12
Simulate payoff at that rate.
Twenty-six biweekly payments equal thirteen monthly payments a year. We model that as paying about one-twelfth extra each month and simulate the loan until it pays off.
The extra annual payment reduces principal faster, which removes future interest and shortens the term — typically by several years on a 30-year loan.
Confirm your servicer applies biweekly payments to principal as they arrive rather than holding them. Some charge a fee to set up biweekly drafts; you can often replicate the benefit for free by adding one-twelfth to each monthly payment yourself.
Frequently Asked Questions
How do biweekly payments save money?
Paying half your mortgage every two weeks produces 26 half-payments a year, which equals 13 full payments instead of 12. That extra payment goes to principal, shortening the loan and cutting total interest.
How much can biweekly payments save?
On a typical 30-year loan, a biweekly schedule can shave roughly four to six years off the term and save tens of thousands in interest, depending on your rate and balance.
Do I need a special program to pay biweekly?
No. You can replicate the benefit for free by adding one-twelfth of your payment to principal each month. Some servicers offer formal biweekly drafts, occasionally for a setup fee.
Will my servicer apply biweekly payments correctly?
Confirm that extra funds are applied to principal as received rather than held until a full payment accumulates. How and when payments post determines whether you actually save interest.
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Rates are illustrative only. APR and payments vary by credit score, loan amount, and market conditions. Subject to credit approval. Not a commitment to lend. NMLS# 1859012. Equal Housing Lender.