Biweekly Mortgage Payment Calculator

See exactly how much interest and time you save by switching from monthly to biweekly mortgage payments.

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Instant results as you typeSide-by-side comparisonFull amortization schedules

Loan Details

$
%

$80,000

%

Monthly Payment

$2,023

12 payments/year

Biweekly Payment

$1,011

26 payments/year

Biweekly savings vs. monthly

Interest Saved

$93,073

Time Saved

5y 10m

Monthly vs. Biweekly Comparison

MonthlyBiweekly
Payment Amount$2,023$1,011
Payments per Year1226
Total Interest$408,142$315,069
Total Cost$728,142$635,069
Payoff DateSeptember 2056November 2050
You Save$93,073(5y 10m faster)

Loan Amount

$320,000

Interest (Monthly)

$408,142

Interest (Biweekly)

$315,069

Amortization Schedule

#DatePaymentPrincipalInterestBalance
1Oct 2026$2,191$458$1,733$319,542
2Nov 2026$2,191$460$1,731$319,082
3Dec 2026$2,191$463$1,728$318,619
4Jan 2027$2,191$465$1,726$318,154
5Feb 2027$2,191$468$1,723$317,686
6Mar 2027$2,191$470$1,721$317,216
7Apr 2027$2,191$473$1,718$316,743
8May 2027$2,191$475$1,716$316,267
9Jun 2027$2,191$478$1,713$315,789
10Jul 2027$2,191$481$1,711$315,308
11Aug 2027$2,191$483$1,708$314,825
12Sep 2027$2,191$486$1,705$314,339

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How Biweekly Payments Work

The core idea is simple: instead of making 12 monthly payments per year, you make 26 half-payments every two weeks. Since 26 × (monthly payment ÷ 2) = 13 monthly payments, you are effectively making one extra full payment per year — without it feeling that way.

Why it saves so much: that extra annual payment goes directly toward principal. A smaller principal balance means less interest accrues every single month afterward. Over a 30-year mortgage, that compounding effect can eliminate 4–5 years of payments and tens of thousands in interest.

How to set it up: some lenders offer a formal biweekly payment plan, though some charge a setup fee. The simpler approach: divide your monthly P&I payment by 12 and add that amount to each monthly payment as extra principal. The math is identical and most lenders accept it at no cost.

Important: always confirm with your lender that extra payments are applied directly to principal — not held and credited toward next month's payment. If the lender holds biweekly payments until they equal a full monthly payment, you lose most of the interest-saving benefit.

For the reasoning behind each approach rather than the numbers, read mortgage payoff strategies.

Biweekly Mortgage Calculator — See Your Savings | FinWiser