About This Calculator
Banks advertise CDs and fixed deposits using APY, which already bakes in the effect of compounding — so projecting a maturity value is a matter of applying that APY across your exact term length, including fractional years for terms like 18 months. This tool does that directly, then shows a comparison of what the same APY would yield across other common term lengths, and an estimate of what an early withdrawal penalty would cost if you needed the money before maturity. Everything is calculated locally in your browser.
APY vs. APR
APR (Annual Percentage Rate)The stated nominal annual rate, before accounting for compounding within the year — if compounding happens more than once a year, your actual return ends up higher than the APR alone suggests.
APY (Annual Percentage Yield)The effective annual return, already including the effect of compounding — this is the number that tells you what you'd actually earn over a full year, and it's what banks are required to advertise for savings products in many countries.
Why fractional terms aren't "linear"Because APY already reflects compounding, a 3-month term doesn't earn exactly a quarter of the annual interest — it earns very slightly less, since compounding effects need a full year to fully play out.
Early withdrawalMost CDs charge a penalty for withdrawing before maturity, typically expressed as a number of months' worth of interest — policies vary significantly by bank and by term length, so always check your specific CD's disclosure.
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