Biweekly Mortgage Calculator
Pay every two weeks instead of monthly — make 26 half-payments a year (13 full payments) and save thousands in interest.
Loan Details
Extra Monthly Payment
Added on top of biweekly payments (split across 2 payments per month).
| Monthly | Biweekly | |
|---|---|---|
| Payment | — | — |
| Frequency | 12×/yr | 26×/yr |
| Total Interest | — | — |
| Total Paid | — | — |
| Payoff Date | — | — |
Show amortization schedule
How Biweekly Mortgage Payments Work #
A biweekly mortgage payment schedule replaces your single monthly payment with a half-payment every two weeks. The math is straightforward: since there are 52 weeks in a year, you make 26 half-payments — which equals 13 full monthly payments instead of the usual 12. That thirteenth payment goes entirely toward reducing your principal balance, which is the key to the savings.
Because mortgage interest is calculated on the outstanding principal each period, every dollar of extra principal you pay reduces the interest that accrues going forward. Over a 30-year mortgage, this compounding effect is powerful. For example, on a $320,000 loan at 6.5%, switching to biweekly payments saves over $90,000 in total interest and pays off the loan roughly 5 years early — without increasing your annual housing cost by a single dollar beyond what you'd pay monthly.
The savings come from two sources: the extra annual payment that reduces principal faster, and the slightly more frequent payment cadence that reduces the average daily balance. Of these, the extra payment is by far the larger factor, accounting for roughly 95% of the total savings.
Biweekly vs. Extra Monthly Payments #
If your servicer doesn't offer a biweekly program, you can achieve nearly the same result on your own. Simply divide your monthly payment by 12 and add that amount as extra principal each month. On a $2,023 monthly payment, that's about $169 extra per month directed toward principal. This "DIY biweekly" approach captures about 95% of the savings of true biweekly payments because the extra principal is applied slightly later in the year on average.
The main advantage of a formal biweekly program is automation — once set up, you don't have to remember to add extra each month. The main disadvantage is that some third-party biweekly services charge hefty setup fees ($200–$400) plus per-payment processing fees ($2–$7 per payment), which eat directly into your interest savings. If your servicer offers biweekly payments for free, it's a no-brainer. If they don't, the DIY approach is usually the better choice.
Precautions Before Switching #
Before enrolling in a biweekly payment program, confirm several things with your loan servicer. First, verify that payments are applied to your principal immediately upon receipt — some third-party services hold your biweekly payments and submit them as a single monthly payment, eliminating any benefit. Second, check whether your loan has a prepayment penalty. While rare on conventional loans originated after 2014, some older mortgages or specialty products may charge a fee for early repayment.
Also make sure biweekly payments align with your pay schedule. If you're paid biweekly, the payments naturally fit your cash flow. If you're paid monthly or semi-monthly, biweekly mortgage payments may create cash flow challenges in months where three payments fall due. Two months per year will have three biweekly payments instead of two, so budget accordingly.
Frequently Asked Questions #
How do biweekly mortgage payments work?
Instead of making one monthly payment, you pay half your monthly amount every two weeks. Since there are 52 weeks in a year, you make 26 half-payments — the equivalent of 13 full monthly payments instead of 12. That extra payment goes directly toward principal, reducing your balance faster and saving significant interest over the life of the loan.
How much can I save with biweekly payments?
On a $320,000 loan at 6.5% over 30 years, switching to biweekly payments can save over $90,000 in interest and pay off your mortgage roughly 5 years early. The exact savings depend on your loan amount, interest rate, and term. Use the calculator above with your own numbers to see your specific savings.
Do I need my lender's permission for biweekly payments?
Yes — contact your loan servicer before switching to biweekly payments. Some servicers offer formal biweekly payment programs, while others may not accept payments more frequently than monthly. If your servicer doesn't support biweekly payments directly, you can achieve nearly the same result by dividing your monthly payment by 12 and adding that amount as extra principal each month.
Are there fees for biweekly mortgage payments?
Some third-party services charge setup fees ($200–$400) and per-payment processing fees to manage biweekly payments. These fees eat into your savings and are usually unnecessary. Most servicers offer biweekly programs for free, or you can simply make one extra monthly payment per year to achieve nearly the same result at no cost.
Is biweekly the same as paying extra each month?
They produce similar results but aren't identical. Biweekly payments reduce your principal every two weeks, so interest accrues on a slightly lower balance throughout the year. Making 12 monthly payments with 1/12 extra principal each month achieves about 95% of the same savings. The biweekly approach has a slight edge because the extra principal is applied earlier in the year on average.