High-Yield Savings Calculator: How Much Interest Could You Earn?
Estimate savings growth from a starting balance, APY, monthly deposits, and time.
Calculate your scenario
How the calculation works
APY is an effective annual yield, so the equivalent monthly rate is (1 + APY)^(1/12) − 1. The balance earns one month of interest before each end-of-month deposit. Banks may credit daily or monthly, and APY can change; this fixed-APY model does not use live bank rates.
Worked example
At 0% APY, $1,000 plus $100 at each month-end for 12 months ends at $2,200. At positive APY, interest increases the ending balance.
How to read your results
The primary figure summarizes the entered scenario. The other figures separate deposits or contributions from modeled interest or investment growth, or show the change in purchasing power or payoff cost. Change an input to compare another scenario; the previous result is hidden until you calculate again.
Frequently asked question
Does a 4% APY mean 4% divided by 12 each month?
No. Dividing by 12 treats the quoted rate like a nominal APR. An APY is already effective over a year, so its equivalent monthly rate comes from taking the twelfth root.
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Sources and limits
CFPB Regulation DD APY calculation. Reviewed September 19, 2026. Financial rules and rates can change; verify current terms with the source or your provider.