Biweekly Mortgage Payment Calculator

Paying your mortgage every two weeks instead of monthly results in 26 half-payments per year — the equivalent of one extra full payment annually. This simple change can shave 4–6 years off a 30-year mortgage and save tens of thousands in interest.

Your mortgage

Original loan amount

Interest rate

Loan term

Years already paid

Monthly payment

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Standard payment

Biweekly payment

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Half of monthly

Years saved

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Pay off this much sooner

Interest saved

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Total savings over life

Monthly P&I payment—

Annual extra payment (biweekly method)—

Payoff with monthly payments—

Payoff with biweekly payments—

Months saved—

Total interest (monthly)—

Total interest (biweekly)—

Total interest saved—

The math behind biweekly payments: There are 52 weeks in a year. Biweekly payments = 26 payments. Each payment = half your monthly payment. So 26 × (monthly/2) = 13 monthly payments per year instead of 12. That one extra payment per year goes entirely to principal, dramatically accelerating payoff.

How do I set up biweekly payments?

Three options: (1) Ask your lender if they offer a biweekly payment program — some do for free, others charge a fee; (2) Make one extra principal payment per year in December, which achieves the same result; (3) Divide your monthly payment by 12 and add that amount to principal each month — same effect, simplest implementation. Avoid third-party biweekly services that charge fees, as you can achieve the same result for free.