High-Yield Savings Calculator

The rate input on this page is an annual percentage yield. The calculator converts that effective APY to the equivalent nominal rate for the selected compounding frequency, so the projected annual growth matches the entered APY.

The lower and higher inputs are editable APY comparisons. The 4.28% middle input is a dated 1-year Treasury short-rate benchmark, not a bank rate offer. A separate FDIC national savings rate card provides a low national reference point.

A savings account does not have the same market risk as a stock investment, but its rate can change. Bank rates may be tiered, promotional, restricted, or unavailable in your state.

Enter withdrawals as negative recurring contributions for a simple stress test. The balance stops at $0; bank fees, withdrawal limits, bonus rules, and taxes are not modeled.

Use a $32,000 emergency-fund balance, $600 added monthly, a 4.35% APY, and a four-and-a-half-year horizon. The calculator converts the effective APY to the nominal rate for the selected monthly compounding, so annual yield is the input you compare across banks. The projection is about $74,407 nominal.

At 3% inflation, those future dollars have about $65,140 of current purchasing power. That comparison is useful for cash planning: growth outpaces the entered inflation rate, but the spread is narrower than the headline APY. For money needed at a fixed date, the real number is often more decision-relevant than the nominal balance.

The APY sensitivity is deliberately much tighter than a stock range. At 4.00% APY the result is about $73,554; at 4.50% it is about $74,776. That difference reflects rate movement on a cash account. It does not include a promotion bonus, monthly service fee, tiered interest, required debit transactions, balance ceilings, or a future Federal Reserve rate path.

A frequent error is treating an introductory APY as permanent for the full horizon. Another is ignoring that balances above a tier ceiling may earn less. Use the calculator to test the rate falling partway through, then verify the actual account terms. For a simple depletion test, enter a negative monthly amount and inspect the yearly schedule.

To make the monthly mechanics explicit, the first month starts at $32,000, adds $600 at month-end, and credits about $115 at the equivalent monthly rate. The next month compounds on the larger total. Repeat that sequence for 54 months and the account reaches about $74,407. This is not a promise of equal interest every month: a bank may change APY, accrue interest daily but post it monthly, or pay different rates by balance tier. The annual APY input remains useful because it reduces those mechanics to a comparable effective rate.