Annual percentage yield calculator

Use our annual percentage yield (APY) calculator to determine the potential earnings or growth of an investment over a year. 

Ian Hawkins

Page written by Ian Hawkins. Last reviewed on May 24, 2024. Next review due July 1, 2025.

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What is annual percentage yield?

Annual Percentage Yield (APY) is a financial term that represents the total annual rate of return an investment will earn, taking into account the effects of compounding. It is expressed as a percentage and reflects the actual interest or investment earnings over a year, including the impact of reinvesting those earnings.

Unlike the nominal interest rate, which only considers the flat rate of return without factoring in compounding, APY provides a more accurate measure of the investment’s growth potential. APY takes into account how frequently the interest or earnings are compounded, such as annually, semi-annually, quarterly, monthly, or even daily.

The APY formula considers both the principal amount (initial investment) and the accumulated interest or earnings. It calculates the interest earned on the principal and any previously accumulated interest, thereby reflecting the compounding effect.

It’s worth noting that APY assumes the investment remains untouched for the entire year and that the interest or earnings are reinvested. In reality, actual returns may vary due to factors such as market fluctuations, fees, and any early withdrawals or changes to the investment.

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This calculator is intended for illustration purposes only and exact payment terms should be agreed with a lender before taking out a loan.

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What is the difference between APY and APR?

The difference between APY and APR lies in what each metric represents and how it is calculated.

APR is a measure of the cost of borrowing money or the interest rate charged on loans or credit cards. It reflects the annualised rate of interest without considering the effect of compounding. APR typically includes the interest rate as well as any additional fees or charges associated with the loan.

On the other hand, APY represents the annualised rate of return earned on savings or investment accounts, accounting for the effect of compounding. APY also consider how often the interest is compounded and provides a more accurate measure of the actual rate of return.

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