Annual Percentage Yield (APY) Calculator

Use this apy calculator to turn a simple interest rate into annual percentage yield and estimate savings and CD returns.
APY Parameters
Enter savings or CD details for the apy calculator
4.59%
Effective APY
$459.00
Interest earned over term
$10,459.00
Final balance
APY calculation summary
Starting balance:$0.00
Nominal interest rate (APR):-%
Compounding schedule:Monthly
Time horizon:- years
Effective APY:4.59%
Interest earned over term:$459.00
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About the APY Calculator

This apy calculator is an apy savings calculator that shows how compound interest turns a simple interest rate into annual percentage yield. By entering your balance, nominal rate and compounding schedule, the apy calculator estimates your effective APY, interest earned and final savings or CD balance so you do not have to guess how to calculate apy by hand.

1

Interest rate vs APY

The apy calculator compares the stated interest rate with the effective APY once compounding is applied. This makes the apy savings calculator useful when you want to see how much more you earn with monthly or daily compounding instead of simple interest.

2

Compounding frequency

As an apy calculator savings tool, this page lets you test annual, quarterly, monthly, weekly and daily compounding. The formula the apy calculator uses matches typical bank disclosures for annual percentage yield.

3

Savings and CD examples

You can use this apy calculator as a quick cd calculator apy helper by entering a CD rate and matching compounding schedule, or as an apy calculator savings tool for regular high‑yield savings accounts.

What affects your APY results?

  • Nominal rate: higher interest rates make the apy calculator show larger returns for the same compounding schedule.
  • Compounding: more frequent compounding pushes the apy savings calculator result higher even when the stated rate stays the same.
  • Time horizon: longer terms give compounding more time to work, so the apy calculator shows larger interest totals even though APY itself is quoted on a one‑year basis.
  • Account type: the same apy calculator can be used for high‑yield savings accounts, money market accounts or CDs, as long as you enter the correct rate and compounding.
APY Calculator FAQ

What does this apy calculator do?

This apy calculator converts a nominal interest rate into annual percentage yield based on your chosen compounding frequency. It then applies that APY to your balance and time horizon so you can see total interest and final savings, similar to other apy savings calculator and cd calculator apy tools.

How to calculate apy from interest rate?

To calculate APY from an interest rate, you take the rate in decimal form, divide by the number of compounding periods per year, add 1, raise to the power of the number of periods, and subtract 1. The formula this apy calculator uses is APY = (1 + r / n)^n − 1, where r is the nominal rate and n is the compounding frequency.

Can I use this apy calculator for CDs as well as savings?

Yes. While it is built as an apy calculator savings tool, you can treat it like a cd calculator apy helper by entering the CD rate, compounding schedule and term. The apy calculator will then show effective APY and total interest over the CD term.

What is the difference between APY and simple interest?

Simple interest ignores compounding and only multiplies balance by the nominal rate and time. The apy calculator, by contrast, includes the effect of compounding, so APY is usually higher than the simple interest rate for the same account.

Is this apy calculator the same as my bank's apy savings calculator?

This independent apy calculator is similar to many bank apy savings calculator pages, but it is not tied to any specific product. You can plug in rates from different banks, compare APY results and pick the savings or CD account that best fits your goals.

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