Biweekly Mortgage Calculator
Compare biweekly vs monthly mortgage payments to see how many years and how much interest you can save.
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How It Works
A biweekly mortgage payment plan splits your monthly payment in half and pays it every two weeks. Because there are 52 weeks in a year, you make 26 half-payments, which equals 13 full monthly payments instead of 12. That one extra payment per year goes entirely to principal, helping you pay off your mortgage years earlier and saving significant interest.
The Formula
Payments per Year = 26 (vs 12 monthly)
Effective Annual Payment = 13 x Monthly Payment
Extra Annual Principal = 1 x Monthly Payment
Variables
- M — Standard monthly mortgage payment
- M/2 — Biweekly payment amount (half the monthly payment)
- 26 — Number of biweekly periods per year
- 13 — Equivalent number of full monthly payments per year with biweekly plan
Worked Example
On a $300,000 loan at 6.5% for 30 years, your monthly payment is $1,896. With biweekly payments of $948 every two weeks, you make 26 payments per year ($24,648) versus 12 monthly payments ($22,752). That extra $1,896 per year toward principal saves roughly $100,000 in interest and pays off the loan about 5 years early.
Practical Tips
- The savings come from making one extra full payment per year, not from the biweekly timing itself.
- Ask your lender if they offer a free biweekly plan before paying a third-party service to set one up.
- You can achieve the same result by dividing your monthly payment by 12 and adding that amount as extra principal each month.
- Some lenders hold biweekly payments until the end of the month, which eliminates the slight interest savings from more frequent payment application.
- Biweekly payments work best with a budget that matches a biweekly paycheck cycle, making it easier to manage cash flow.
Frequently Asked Questions
How does a biweekly plan save me money if each payment is the same total?
The savings come from the calendar math. Twelve months of payments means 12 full payments per year. But 52 weeks divided into biweekly periods gives you 26 half-payments, which equals 13 full payments. That 13th payment goes straight to principal, reducing your balance faster and lowering total interest over the life of the loan.
Can I set up biweekly payments on my own without my lender?
Yes. Simply divide your monthly payment by 12 and add that amount as extra principal to each monthly payment. For example, if your payment is $1,800, add $150 extra principal each month. This gives you the equivalent of 13 payments per year. Just make sure your lender applies the extra amount to principal, not to the next month payment.
Are biweekly payments worth it on a 15-year mortgage?
They still help but the savings are smaller. A 15-year mortgage already has less interest because of the shorter term and typically lower rate. Biweekly payments on a 15-year loan might save 1-2 years and a smaller amount of interest compared to the 4-5 years and large savings on a 30-year mortgage.
Will my lender charge a fee for biweekly payments?
Some lenders offer free biweekly programs, while others charge a setup fee or per-payment fee. Third-party biweekly services often charge $300-$500 to set up plus ongoing fees. Avoid these services entirely. You can replicate the benefit for free by making one extra monthly payment per year or adding 1/12 of your payment as extra principal each month.
Does biweekly payment timing actually reduce interest between payments?
In theory, paying every two weeks means your principal is reduced mid-month, so slightly less interest accrues in the second half of the month. In practice, many lenders hold biweekly payments in a suspense account until the full monthly amount is collected, negating this timing benefit. The real savings come from the 13th annual payment, not from payment timing.