High-Yield Savings Interest Calculator

High-Yield Savings Interest Calculator - see what your savings really earns, day by day

High-Yield Savings Interest Calculator

See what a high-yield savings account actually pays on your balance, day by day. Enter your own numbers. This is an educational illustration, not a forecast or a recommendation for any bank.

$
%
months
$/month
$
day 1-30
Interest per day (on your starting balance)-
Interest in 30 days (on your starting balance)-
Total you deposit-
Total interest earned-
Final balance-
Same balance at the FDIC national average (0.38% APY)-
Extra interest vs the national average-
Enter values and press Calculate interest.

Is your "4.00%" really 4.00%? Check a tiered rate

Some accounts pay the headline rate only up to a balance cap, then a lower rate on the rest. Enter the tiers and see the blended rate you actually earn.

$
$
%
%
Blended APY you actually earn-
Interest in one year at the blended rate-
Interest in one year at the headline rate-
What the tiering costs you per year-
Enter values and press Check the blended rate.

How it works: interest accrues on your daily balance, the method used in the AlphaCents guide to high-yield savings interest. A month is the average month (365/12 days), so 12 months on a fixed balance earns exactly balance x APY. A mid-month extra deposit earns interest only from the day after it lands, in a 30-day first month: for example, $10,000 at 4.00% APY with $5,000 added on day 15 earns $41.10 in that month (15 days at $10,000 plus 15 days at $15,000). Monthly deposits are added at the start of each month. Banks usually credit interest monthly, so a real account may pay a few dollars more than this estimate because credited interest then earns interest too; this calculator does not compound interest on interest. The FDIC national average savings rate shown (0.38% APY) is the FDIC figure as of October 19, 2026. HYSA rates are variable and can change at any time, so treat any APY you enter as an assumption, not a promise. This tool does not recommend any bank or account.

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