What Is a Biweekly Payment Plan?
A biweekly payment plan takes your usual monthly payment, cuts it in half, and applies that half payment every two weeks. Because a year has 52 weeks, you end up making 26 half-payments per year instead of 12 full payments — the equivalent of 13 months of payments in 12 months. That one extra payment each year goes entirely toward principal, which is where the savings come from.
How to Use the Biweekly Calculator
- Enter the loan amount. This is the total principal you plan to borrow.
- Enter the annual interest rate. Use the yearly rate as a percentage, e.g. 6.5 for 6.5%.
- Enter the loan term in years. The tool converts it to months automatically.
- Click “Compare Payments”. You get the biweekly payment, the interest you save and the time you shave off the loan.
How the Comparison Works
The tool first calculates the standard monthly payment with the classic amortization formula. For the biweekly plan it charges balance × (annual rate ÷ 26) of interest every two weeks and applies half the monthly payment against it. Because 26 biweekly payments equal 13 monthly payments a year, the extra half-payment accelerates the payoff and reduces the total interest charged.
Why Biweekly Payments Work
Interest is calculated on the outstanding balance, so the faster you shrink that balance, the less interest accrues. A biweekly schedule effectively forces you to make one extra payment per year without changing your monthly budget much. Over a 30-year mortgage, that simple shift can save tens of thousands of dollars and cut several years off the loan.
Frequently Asked Questions
What is a biweekly payment plan?
A biweekly payment plan splits your usual monthly payment in half and you pay every two weeks instead of once a month. Because a year has 52 weeks, you make 26 half-payments, the equivalent of 13 full monthly payments a year instead of 12.
How does biweekly payment save interest?
Paying every two weeks means one extra half-payment is applied to the loan each year, and that extra money goes straight to principal. Because interest accrues on the outstanding balance, reducing principal faster shrinks the balance more quickly and cuts the total interest over the life of the loan.
Is this calculator 100% free?
Yes. The biweekly payment calculator is completely free for unlimited use, with no sign-up, no hidden fees and no premium limits.
Does the tool store my data?
No. All calculations run locally in your browser. Your loan amount, rate and term are never uploaded or stored on any server.
Can I use biweekly for any loan type?
Yes. The math applies to any fixed-rate loan, such as mortgages, auto loans, personal loans and student loans. Just enter the loan amount, rate and term; if your lender supports biweekly billing or you budget the extra payments yourself, the savings shown here apply.