Biweekly Mortgage Time Saved Calculator
See how paying half your mortgage every two weeks shortens the loan and cuts total interest, versus paying once a month.
How it works
Biweekly payment = monthly payment ÷ 2, paid 26 times a year (≈ 13 monthly payments) · Extra principal each year shortens the term and cuts interest
There are 52 weeks in a year, so paying half your mortgage every two weeks means 26 half-payments — the equivalent of 13 full monthly payments instead of 12. That one extra payment each year goes straight to principal, so the balance falls faster and less interest accrues. On a long loan the effect compounds into years shaved off and tens of thousands saved.
Worked example
A $300,000 loan at 6.5% over 30 years has a $1,896 monthly payment and about $383,000 in total interest. Paying $948 every two weeks instead pays it off in roughly 25 years — about 5 years early — and cuts total interest by around $75,000, purely from the one extra payment a year.
Frequently asked questions
Is biweekly really different from just paying monthly?
Yes, slightly, because you make 26 half-payments — 13 monthly payments’ worth — each year instead of 12, and the money hits principal sooner within each month. The bulk of the benefit is that extra 13th payment, which you could also replicate by adding a twelfth of a payment to each monthly bill.
Does my lender apply biweekly payments correctly?
Not always. Some lenders hold each half until the full monthly amount arrives, erasing the benefit, and some charge fees to set up biweekly billing. Confirm that extra payments go to principal immediately — or simply pay a little extra monthly yourself.
Could I get the same result another way?
Yes. Adding one extra full payment a year, split as one-twelfth extra on each monthly payment, produces nearly the same savings without any biweekly arrangement — and keeps you in control of the timing.
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This is an educational estimate, not financial advice. Real results depend on rates, taxes, fees and market returns that no calculator can guarantee — confirm figures with your lender or a licensed advisor.