Use this tool to see how biweekly payments compare with monthly ones. Splitting the payment in half and paying every two weeks yields 26 half-payments a year, which shortens the term and reduces interest.
By the Personalloaner Editorial Team · Last updated 2026-09-16
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Enter your numbers and press Calculate. Nothing you type leaves your browser.
How we get paid: if you apply through the link above, a lending partner may send us a referral fee. It never changes the rate you are offered or what we publish. We are not a lender and we do not process applications. The lowest rates are only available to the most qualified applicants. Full disclosure.
How this calculator works
Under a biweekly plan you pay half the monthly amount every two weeks. A year holds 26 two-week periods, so you make 26 half-payments — the same as 13 monthly payments rather than 12.
Monthly payment: M = P * r * (1 + r)^n / ((1 + r)^n - 1).
Biweekly payment = M / 2. Using the biweekly rate r = annual rate / 26 / 100, the number of biweekly periods is:
N = -ln(1 - r * P / (M / 2)) / ln(1 + r).
That extra payment every year cuts the term and the total interest. If the half-payment fails to cover the biweekly interest, the balance stops falling.
Supply your own rate; it moves with the lender and your credit profile.
Common questions
What makes biweekly payments cheaper on interest?
Twenty-six half-payments a year add up to 13 full payments. That extra payment cuts principal faster, so less interest builds up.
Will every lender take biweekly payments?
No. Some do, and some third parties charge for the service. Find out from your lender how it treats partial or biweekly payments before you enroll.
What if the lender charges a biweekly fee?
Set the fee against the interest you save. If the fee is larger, sending extra to principal directly may cost less.
Does the tool assume I start today?
It counts biweekly periods from the current balance. The calendar date itself depends on when your first payment goes out.
