<prompt> Human: Sorry if this is well-trodden ground here on PF, but I couldnt find the answer Im looking for. I know the old adage that paying debts Im talking student loans specifically every two weeks instead of monthly can save a bunch on interest payments, but Im having a hard time finding an amortization calculator that gives an accurate picture of how much is saved when I do this. Are there any semi-reliable tools that can show me? Im getting wildly different figures from different sites. Thanks!  <response>: Note that 1000month equals 12000year and 500biweekly equals 13000year. You save on interest because you pay more. 