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What the bi-weekly calculator answers
Bi-weekly mortgages have a reputation for saving tens of thousands of dollars, and the claim is true, but the reason is rarely explained. The schedule does not make interest cheaper. It quietly creates one additional monthly payment every year. This tool isolates that effect, shows what it is worth on your loan, and subtracts any fees a payment company would charge so you can see the saving you would actually keep.
How it works
Enter your balance, rate and remaining term. The calculator finds your monthly payment and half of it, then models two situations. In the first, payments are made and interest accrues every 14 days. In the second, your servicer holds the half-payments and applies one extra full payment each year. Pick the one that matches what your servicer confirms. The fee field lets you deduct third-party charges from the saving.
How it is calculated
The bi-weekly payment is monthly payment ÷ 2. Twenty-six of them make 13 × monthly payment per year. In the accrual model, interest each period is balance × rate ÷ 26. In the held model, the extra is one-twelfth of a monthly payment added to each month, which adds up to one extra payment a year.
Worked example: $300,000 at 6.5%, 30 years
Your monthly payment is $1,896.20, so the bi-weekly payment is $948.10 and you pay $24,651 a year instead of $22,754, about $1,896 more. With interest accruing every 14 days the loan is done 5 years 10 months early and saves about $88,122. With the held model the saving is about $87,256. Doing it yourself costs an extra $158.02 a month and returns essentially the same.
What to watch for
Fees can wipe out the benefit
Some third-party services charge a setup fee and a fee on every transfer, and they may hold your money for days before paying your servicer. Put those fees in the calculator. If a lender or servicer offers the plan at no cost, that is a better deal than any outside service.
Cash-flow is the real test
An extra payment a year is roughly 8.3% more than your principal-and-interest payment, every year. If that stretch is uncomfortable, use the payoff calculator to test smaller amounts, and keep an emergency fund in place first.
Related decisions
If you are choosing a term, a 15-year loan on the main mortgage calculator builds equity faster than a bi-weekly 30-year but locks in a higher payment. If your rate is above what you could get today, price a refinance first.
Estimate only. Confirm with your servicer how bi-weekly payments are applied and whether fees apply.
Frequently asked questions
How does a bi-weekly mortgage save money?
You pay half a monthly payment every two weeks. Because there are 26 two-week periods in a year, that adds up to 26 half-payments, or 13 full monthly payments, instead of 12. The extra payment each year goes to principal, which shortens the loan and cuts interest.
How much will I save on a $300,000 loan at 6.5%?
With a 30-year term, a true bi-weekly plan saves about $88,122 in interest and finishes roughly 5 years 10 months early. If your servicer only applies the extra once a year, the saving is close, about $87,256.
Do I need to pay a company to set up bi-weekly payments?
No, and some third-party programs charge enrollment and per-payment fees that eat into the saving. You can get the same effect by adding one-twelfth of your payment, which is $158.02 on this loan, to each monthly payment and marking it principal-only. Ask your servicer whether they offer bi-weekly for free.
Will my servicer apply payments every two weeks?
Not always. Many servicers hold each half-payment until they have a full one, then apply it monthly. In that case the benefit comes only from the extra payment per year, which is the second mode in the calculator. Ask how payments are applied before you enroll.
Is bi-weekly better than just paying extra each month?
Mathematically they are close. Bi-weekly matches the rhythm of a paycheck, which makes it easier for some people to stick with. A monthly extra is simpler and lets you change the amount whenever your budget changes.
What if I am paid twice a month rather than every two weeks?
Twice a month is semi-monthly, which is 24 payments a year, and it does not create an extra payment. To get the bi-weekly benefit you need 26 payments a year, or a manual extra payment.