Paying half your mortgage every two weeks means 26 half-payments a year — one extra full payment annually. See how many years and how much interest that removes. Turn on the biweekly toggle.
You pay half the monthly amount every two weeks. Because there are 52 weeks, that is 26 half-payments — equal to 13 monthly payments a year instead of 12, so you make one extra payment annually.
On a typical 30-year loan it shaves roughly 4–6 years and saves tens of thousands in interest, with no big change to your budget.