Biweekly Mortgage Payment Calculator
On a $300,000, 30-year mortgage at 6.5%, biweekly payments of $948 save about $88,000 in interest and cut the payoff from 30 years to about 24.
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How it works
The calculator starts with your standard monthly payment: loan amount × monthly rate ÷ (1 − (1 + monthly rate)^−months). A biweekly plan pays half of that amount every two weeks — 26 half-payments a year, which is the equivalent of 13 full monthly payments instead of 12. The extra payment amount goes straight to principal each period, and because interest is charged on the remaining balance, the balance shrinks faster and less interest accrues. The calculator runs the amortization period by period until the balance reaches zero, then compares the total interest against the standard 12-payment schedule to show what you save and how much earlier you are done.
Worked example
Take a $300,000 mortgage at 6.5% for 30 years. Your regular payment is about $1,896 a month, and over the full term you would pay roughly $383,000 in interest. Switch to biweekly payments of about $948 every two weeks — 26 half-payments a year instead of 12 full payments. The loan now ends in about 24 years instead of 30, and total interest drops to about $294,000 — saving roughly $88,000 while you pay the same amount each month.
Assumptions
- Fixed-rate loan: Assumes a fixed APR for the full term with no rate resets or payment changes
- Payment timing: Biweekly payments are applied to the balance every two weeks (26 per year); some lender programs hold the second half-payment until the monthly due date, which reduces the benefit
- No fees: No enrollment fees, prepayment penalties, or escrow are modeled — a lender setup fee subtracts from the gross savings
- Lender application: Your lender must apply the extra half-payment to principal for the savings to materialize
What the result means
The interest-saved number is what the biweekly schedule earns you compared with paying monthly, and the time-saved number shows how much earlier you will own the home outright. If your lender offers biweekly conversion at no cost — or you simply make one extra payment a year yourself — the savings are effectively risk-free. If there is a setup fee, subtract it from the interest saved to get the true gain; a few hundred dollars is usually still worth it on a 30-year loan.
Frequently asked questions
Is a biweekly mortgage payment worth it?
Usually yes for a long-term fixed-rate loan. On a $300,000 mortgage at 6.5% for 30 years, biweekly payments save about $88,000 in interest and pay the loan off roughly 6 years earlier — with no change to the amount you pay each month.
How much does paying biweekly save on a mortgage?
The savings grow with your balance and rate. On a $300,000 loan at 6.5%, the biweekly schedule saves about $88,000 in interest over the life of the loan. A $500,000 loan at 7% saves more than twice that amount.
How does a biweekly mortgage payment plan work?
You pay half your monthly payment every two weeks instead of the full amount once a month. Because there are 26 two-week periods in a year, you make 13 full payments per year instead of 12 — the extra payment goes to principal and shortens the loan.
Is paying biweekly the same as making one extra payment a year?
Yes — the math is identical. Twenty-six half-payments equal 13 full payments, which is one extra payment per year. If your lender does not charge for biweekly conversion, either approach gives the same savings.
Are there fees for biweekly mortgage payment plans?
Some third-party programs charge a setup fee and a per-payment fee, which eat into your savings. Many lenders offer biweekly conversion free, and you can also set up a separate monthly transfer to get the same result without any fee.
Does a biweekly payment plan affect my credit score?
No direct effect — on-time payments help your history either way, and extra principal payments are not reported as something special. Paying off early simply stops the credit account sooner, which can slightly lower average account age.
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This calculator is an estimate for informational purposes only and is not financial advice. Actual savings depend on your lender's biweekly program, whether payments are applied to principal immediately, enrollment fees, and rate changes. Confirm the terms with your lender and consult a financial professional before making a decision.