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.
These figures are estimates. For neutral, official guidance on mortgage costs and what lenders can charge, see the CFPB's Owning a Home guide.
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.