Use this free APY calculator to estimate annual percentage yield, term interest, and ending balance from a deposit amount, stated annual interest rate, compounding frequency, and term length.
$1,000 at 4% compounded 12x/year
This is APY math for planning only. Real deposit disclosures can use exact account terms, daily-balance rules, fees, minimum balances, balance tiers, bonuses, taxes, and other bank or credit union details not modeled here.
Recent APY estimates will appear here.
APY estimates stay in this browser tab. They do not read bank disclosures, fees, balance tiers, bonuses, withdrawals, taxes, or account-specific rules.
Inputs and recent answers stay in this browser tab and are not sent to a server.
Convert a stated deposit interest rate into an estimated APY.
Compare monthly, quarterly, annual, and daily compounding assumptions.
Estimate interest for a one-year or shorter deposit term.
Check whether two bank offers are using rate and APY language differently.
About 4.074% APY and $40.74 interest
About 4.341% APY and $217.07 interest
About 3.867% APY and about $190.98 interest
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Plain-language answers about when to use the estimate, what your numbers mean, what is left out, and how privacy works.
Use it when you want to test the exact inputs on this page: Convert a stated deposit interest rate into an estimated APY. Compare monthly, quarterly, annual, and daily compounding assumptions. The result is a check against your assumptions, not proof that a lender, tax app, broker, platform, or provider will use the same number.
Starting deposit means the amount you want to use for the interest estimate. Stated annual interest rate means the nominal yearly rate shown before compounding. Enter 4 for 4%, not 0.04. Compounding frequency means how many times per year interest is added in the estimate, such as 12 for monthly or 365 for daily. Term length means how many days you want to estimate interest for. Use 365 for a simple one-year comparison.
APY means annual percentage yield. CFPB Regulation DD treats APY as the yearly rate that reflects the total amount of interest paid on an account based on the interest rate and compounding frequency. That makes APY useful when comparing deposit accounts that compound differently.
Not always. The stated annual interest rate is the rate before compounding. APY includes compounding, so monthly or daily compounding can make the APY higher than the stated rate when the rate is positive.
Daily compounding adds interest more often. Each small interest credit can itself earn interest for the rest of the year, so the annual yield rises slightly compared with annual compounding at the same stated rate.
Yes, for a quick comparison of rate and compounding assumptions. For a real CD or savings account, use the bank or credit union disclosure because the official APY, maturity date, fees, penalties, balance tiers, and account rules control the actual return.
In plain language: The calculator estimates APY as ((1 + stated annual rate / compounding periods) raised to the number of compounding periods, minus 1) x 100. It then applies the same annual growth pattern across the term days to estimate interest and ending balance. If the APY looks too high or low, check that the rate is entered as a percent, the compounding frequency matches the offer, and the term is in days.
Estimated APY is the one-year yield from the rate and compounding frequency. Term interest and ending balance show what that same growth pattern would produce for the days entered.
This is educational APY math, not an official bank disclosure, account quote, savings recommendation, or CD offer. It does not include fees, minimum-balance rules, balance tiers, bonuses, withdrawals, changing rates, leap-year rules, taxes, promotional terms, or account-specific daily-balance methods. Use the account disclosure, bank calculator, or credit union terms for the official APY and actual payout.
Check whether the account disclosure already gives APY. If it does, do not reverse-engineer it from a different stated rate unless you know the compounding rule matches.
No. CFPB disclosure rules treat APY carefully, and real accounts can have fees, bonuses, minimum balances, and other terms. This page only estimates the compounding math from the numbers you enter.
APY is usually easier for deposit-account comparisons because it includes compounding. Still compare fees, access limits, withdrawal rules, minimum balances, insurance coverage, and how long the rate is guaranteed.
No. The calculator runs in your browser tab. Recent answers stay only on the page while you use it, and they are not sent to a server.