Biweekly Savings Plan Calculator
See how a fixed deposit every two weeks grows — 26 deposits a year, plus compound interest, into a real savings total.
How it works
Deposits per year = 26 · Future value = deposit × [ (1 + r)^n − 1 ] ÷ r, where r = APY ÷ 26 and n = years × 26
Paying yourself every two weeks means 26 deposits a year rather than 12 — two "extra" deposits compared with a monthly plan, because most years have 26 fortnights. Each deposit then earns interest for the rest of the term, so the balance ends up larger than the raw sum of deposits. The earlier deposits compound the longest, which is why total interest grows faster the longer you keep the plan going.
Worked example
Depositing $100 every two weeks for 3 years is 78 deposits totalling $7,800. At a 4% APY (about 0.1538% per fortnight) the balance grows to roughly $8,270 — about $470 of compound interest on top of what you set aside.
Frequently asked questions
Why 26 deposits a year instead of 24?
A year has about 52 weeks, so depositing every two weeks gives 26 payments — not 24. That is where the "two bonus deposits" effect of biweekly plans comes from.
Is this the same as a monthly savings plan?
No. Biweekly saving front-loads slightly more money into the account each year (26 × deposit vs 24 × the same deposit), so it grows a little faster than depositing the same amount twice a month.
Does the interest rate matter much?
Over a few years the deposits dominate, but the higher the APY and the longer the term, the larger the share of the final balance that comes from compound interest rather than your own money.
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Educational estimate, not financial advice.