Biweekly Mortgage Payment Calculator

Enter your loan details to see how much time and interest a biweekly payment schedule saves compared to standard monthly payments.

Biweekly Mortgage Payment Calculator

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Loan amount ($)

Interest rate (% annual)

Loan term (years)

Standard monthly payment	$1,264.14
Biweekly payment (half of monthly)	$632.07
New payoff time	24.2 years
Time saved	5.8 years
Interest saved	$58,747.85

Assumes your lender applies biweekly payments to principal immediately (not held until a full monthly amount accrues). Confirm your specific servicer's policy before switching.

How it works

Biweekly payment = Standard monthly payment / 2, paid every two weeks 26 biweekly payments/year = the equivalent of 13 monthly payments, not 12 That extra "13th payment" goes entirely to principal, accelerating payoff

Example

A $200,000 loan at 6.5% for 30 years: standard monthly payment $1,264.14. Switching to $632.07 every two weeks pays the loan off in about 24.2 years instead of 30 - saving roughly $58,748 in interest.

Step-by-step guide

Enter your loan amount, rate, and term exactly as they appear on your mortgage statement.
Compare the standard monthly payment to the biweekly payment (simply half of the monthly amount).
Review the payoff time and interest savings - then confirm with your loan servicer that they'll apply biweekly payments to principal immediately, not hold them.

Why the "extra payment" trick works without changing your monthly budget

The math here isn't magic - it comes from a quirk of the calendar. There are 52 weeks in a year, so paying every two weeks produces 26 payments annually, not the 24 you'd get by simply splitting 12 monthly payments in half. Those extra 2 "half-payments" add up to one full extra monthly payment per year, applied directly to principal. Because mortgage interest compounds on a shrinking balance, an extra principal payment early in the loan has an outsized effect on total interest paid over the decades that follow - which is why a schedule that only feels like "half payments twice a month" ends up saving years and tens of thousands of dollars.

Common mistakes

Assuming any "biweekly payment plan" your lender offers automatically applies extra payments to principal - some third-party biweekly payment services simply hold your extra half-payment and apply it as one lump monthly payment, which doesn't accelerate payoff at all, and some charge a setup fee for a service you could replicate yourself for free.

Confusing "biweekly" (every 2 weeks, 26 payments/year) with "semi-monthly" (twice a month, 24 payments/year) - semi-monthly payments don't create the extra-payment effect, since 24 half-payments equal exactly 12 full payments, not 13.

Frequently asked questions

Can I just make one extra payment per year instead of switching to biweekly?

Yes - making one extra full monthly payment toward principal each year achieves essentially the same result as biweekly payments, without needing to change your regular payment schedule at all.

Do I need my lender's permission to switch to biweekly payments?

You should confirm with your servicer how they'll apply the payments - some automatically credit each biweekly payment to principal right away, while others hold partial payments until a full monthly amount accumulates, which defeats the purpose.

Is a biweekly schedule better than just paying extra whenever I can?

Both reach a similar destination - the biweekly schedule simply automates the discipline of consistently paying extra, which works well for people who'd otherwise struggle to remember or prioritize occasional lump-sum extra payments.

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