Biweekly Mortgage Calculator

Last updated: June 2026

See how paying half your mortgage every two weeks pays it off years early. Enter your loan amount, rate, and term to see your biweekly payment and time saved for free — then unlock your exact debt-free date and full schedule.

A biweekly mortgage payment plan means paying half your monthly mortgage payment every two weeks instead of one full payment a month. Because there are 52 weeks in a year, you make 26 half-payments — the equivalent of 13 full payments — so one extra payment a year goes straight to principal. On a 30-year, $300,000 loan at 6.5%, that single extra annual payment typically removes about 5 to 6 years from the term and saves roughly $80,000 to $90,000 in interest. The calculator below shows your exact biweekly payment, new payoff date, and interest saved. It models principal and interest only — taxes, insurance, and PMI are excluded.

Your mortgage

We derive your standard principal & interest payment from this.

Switching to biweekly payments

Biweekly payment

$948

Half of your $1,896 monthly payment

Time saved

5 yr 10 mo

vs 30 yr on monthly

Paying $948 every two weeks makes 26 half-payments — 13 full payments — a year, which could save you 5 yr 10 mo and $87,256 in interest. Unlock the details below.

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How biweekly mortgage payments work

On a standard monthly schedule you make 12 payments a year. A biweekly plan splits each monthly payment in half and charges that half every two weeks. Since a year has 52 weeks, you end up making 26 half-payments — which add up to 13 full payments rather than 12. That 13th payment each year is applied entirely to principal, and because interest is charged on the remaining balance, removing principal early erases all of the future interest that balance would have generated.

This calculator derives your standard mortgage payoff payment from your loan amount, rate, and term, then runs the biweekly schedule alongside it. The difference between the two is the time and interest you save by paying every two weeks.

The math: 13 payments a year, not 12

The table below compares a monthly schedule with a biweekly schedule on the same loan. The only difference is the one extra full payment a year, yet the impact on the payoff date and total interest is dramatic. Figures are for a 30-year, $300,000 loan at a 6.5% fixed rate.

Payment planPayments per yearYears to pay offTotal interest
Monthly ($1,896/mo)12 payments30 years~$382,600
Biweekly ($948 every 2 weeks)26 half-payments (= 13)~24 years 2 months~$295,400
You save1 extra payment/yr~5 years 10 months~$87,000

Example figures based on standard amortization at a 6.5% fixed rate; your results depend on your own balance, rate, and term.

Biweekly vs. one extra payment a year

A biweekly plan and an extra monthly payment reach the same place by different paths. Both send roughly one additional full payment to principal each year. If your servicer does not offer biweekly billing — or charges a fee for it — you can replicate the result for free by dividing your monthly payment by 12 and adding that amount to each payment. To model any custom extra amount or a one-time lump sum, use the mortgage calculator with extra payments.

Before you switch to biweekly

  • Confirm payments hit principal immediately. Some servicers hold each half until the full monthly amount arrives, which cancels the benefit. Ask before enrolling.
  • Avoid third-party fees. Paid biweekly conversion services charge for something you can do yourself for free as an extra monthly principal payment.
  • Check for a prepayment penalty. A small number of loans charge for paying ahead — review your loan documents first.
  • Keep your priorities in order. Fund an emergency reserve and capture any employer retirement match before accelerating a low-rate mortgage.

Frequently asked questions

How does a biweekly mortgage calculator work?
It derives your standard monthly principal-and-interest payment from your loan amount, interest rate, and term, then compares two schedules: your normal monthly plan and a biweekly plan that pays half that amount every two weeks. Because there are 52 weeks in a year, paying every two weeks produces 26 half-payments — the equivalent of 13 full monthly payments — instead of 12. That one extra payment a year goes straight to principal, so the calculator reports the months and total interest you save.
How much do biweekly payments save on a mortgage?
On a typical 30-year, $300,000 loan at 6.5%, switching to biweekly payments pays the loan off roughly 5 to 6 years early and saves around $80,000 to $90,000 in interest. The exact figures depend on your balance, rate, and term — enter your numbers above to see your personalized savings. The benefit comes entirely from the extra full payment you make each year, not from any change to your interest rate.
Are biweekly payments the same as paying extra each month?
Effectively, yes. A biweekly plan sends one extra full payment to principal each year. You can achieve the identical result by dividing your monthly payment by 12 and adding that amount to each month's payment — no biweekly arrangement required. Many people prefer the biweekly cadence because it lines up with biweekly paychecks and feels less like a budget hit, but the underlying math is the same as a modest extra monthly payment.
Will my lender accept biweekly payments?
Not all servicers accept true biweekly payments, and some that do may hold each half-payment until the full monthly amount arrives, which eliminates the benefit. Others charge an enrollment or per-payment fee for a biweekly program. Before signing up, confirm that your servicer applies extra amounts to principal immediately and at no cost. If they don't offer biweekly billing, you can simply make the equivalent extra monthly payment yourself for free.
Do biweekly payments lower my monthly payment?
No. Biweekly payments shorten your loan term and reduce total interest, but they do not lower your required payment — you are paying slightly more overall each year, just split into smaller, more frequent amounts. If a lower monthly payment is your goal, a mortgage recast (which re-amortizes a lump sum over the same term) is the tool to use instead.
Is this biweekly mortgage calculator free?
Yes. Your biweekly payment amount and estimated time saved appear instantly and free. Entering your email also unlocks your exact debt-free date, total interest saved, and the full accelerated amortization schedule at no cost. The site is supported by advertising so the tools stay free for everyone.

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