Compare biweekly vs monthly mortgage payments. Biweekly payments result in 26 half-payments (13 full payments) per year instead of 12, helping you pay off your mortgage years faster.
The biweekly mortgage payoff trick is simple. Instead of making one full mortgage payment each month, you pay half the payment every two weeks. Since there are 52 weeks in a year, you end up making 26 half-payments, which equals 13 full payments — one extra payment per year compared to the standard 12. That extra payment goes entirely to principal, which compounds the savings dramatically over the life of the loan.
On a typical 30-year mortgage, switching to biweekly payments shaves 4–6 years off the payoff timeline and saves tens of thousands of dollars in interest. The mechanism is the same as making any other extra principal payment: a smaller remaining balance accrues less interest in every subsequent month, so each "extra" dollar paid early saves several dollars of interest later.
This calculator compares the standard monthly schedule to the biweekly schedule on the same loan. The savings number is real, but the implementation matters. Some lenders charge enrollment fees for true biweekly programs (often $300–$400). You can achieve the same result for free by simply paying 1/12 of your monthly payment as extra principal each month, or by making one extra full payment per year. The math is what produces the savings — not the payment frequency itself.
$300,000 loan at 6.5% over 30 years Monthly schedule: Monthly payment: $1,896 Total interest paid: $382,500 Loan retired: 360 months (30 years) Biweekly equivalent: Half-payment: $948 every 2 weeks Total interest paid: ≈ $304,900 Loan retired: ≈ 304 months (25 years, 4 months) Savings: $77,600 in interest, 4 years 8 months earlier payoff.
Original loan: $400,000 at 6.0%, currently 5 years in Current balance: ≈ $375,000 Remaining term: 25 years (300 months) Switching to biweekly now (or adding 1/12 of payment as extra principal): Standard remaining interest: ≈ $307,000 Biweekly remaining interest: ≈ $244,000 Savings: $63,000, and the loan is paid off about 4 years earlier. Even starting late, the math still works heavily in your favor.
$250,000 loan at 7.0% over 30 years, monthly payment $1,663 Lender charges $300 to enroll in biweekly autopay. Alternative: add $138.58 (1/12 of $1,663) as extra principal each month manually. Result: identical payoff timeline and identical interest savings — without the $300 fee. Setup: when you autopay your monthly mortgage, also schedule a $138.58 "principal-only" payment for the same date. Most lenders have this option in their online portal.
Use this calculator when you already own a home with a mortgage and want to evaluate whether accelerated payoff makes sense, or before you sign a mortgage if you want to see what an extra payment per year actually buys. The biweekly approach is the most popular flavor of "pay off the mortgage early" precisely because it requires minimal behavior change — money comes out of the same paycheck cycle that pays everything else.
The biweekly approach is best for people who: are paid biweekly and find it psychologically easier to align mortgage payments with paychecks, want to retire the mortgage before retirement, or have a stable cash-flow surplus and no higher-priority use for the extra ~$130–$200/month.
Skip biweekly (or any accelerated mortgage payoff) when: your mortgage rate is lower than expected investment returns (a 3.0% mortgage from 2020 vs. 7% expected equity returns favors investing instead), you don't have an emergency fund built, you carry credit card or other high-interest debt, or you have not yet maxed your retirement accounts and employer match. The opportunity cost matters.
Pair this with the mortgage-payment calculator (to confirm your monthly base payment) and the mortgage-refinance calculator (because refinancing to a lower rate and then making biweekly payments often dominates either move alone).
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Interest Saved
$88,122
Time Saved
6 yrs 10 mo
Monthly Payment
$1,896
Biweekly Payment
$948
| Year | Monthly Balance | Biweekly Balance |
|---|---|---|
| 1 | $296,646.82 | $294,685.12 |
| 2 | $293,069.08 | $289,013.76 |
| 3 | $289,251.73 | $282,962.01 |
| 4 | $285,178.72 | $276,504.36 |
| 5 | $280,832.93 | $269,613.57 |
| 6 | $276,196.10 | $262,260.60 |
| 7 | $271,248.73 | $254,414.45 |
| 8 | $265,970.03 | $246,042.04 |
| 9 | $260,337.81 | $237,108.07 |
| 10 | $254,328.38 | $227,574.87 |
| 11 | $247,916.49 | $217,402.26 |
| 12 | $241,075.18 | $206,547.35 |