Calculyn

Biweekly Mortgage Calculator

See how paying half your mortgage every two weeks pays off your loan years early.

$
%
years

Results update as you type.

Payoff time with biweekly

These inputs don't produce a valid result. Check for zeros or values that can't go together.

Payoff time with biweeklyCheck inputs

Results are estimates for planning and are not financial advice.

Was this calculator helpful?

Quick answer

A $300,000 loan at 6.5% over 30 years pays off about 5 years early with biweekly payments and saves tens of thousands in interest.

How it works

Paying half your monthly payment every two weeks means 26 half-payments a year — 13 full payments instead of 12. That extra payment each year goes straight to principal and can cut years off a 30-year loan.

Formula

Biweekly payment = Monthly payment ÷ 2, paid 26 times per year

Assumptions & limitations

  • Lender applies payments every two weeks
  • No prepayment penalties
  • Interest compounds per payment period

Formula and assumptions reviewed October 2026 by the Calculyn team. How we build our calculators

Frequently asked questions

Is biweekly the same as twice a month?

No — twice a month is 24 payments a year; every two weeks is 26, which adds one extra monthly payment annually.

Can I just pay extra principal instead?

Yes — adding 1/12 of a payment to each monthly payment has nearly the same effect.