Effective Annual Interest Rate Calculator

Effective Annual Interest Rate Calculator

This effective annual interest rate calculator helps you calculate the EAR given the nominal interest rate and number of compounding periods.

Below is a screenshot of the effective annual interest rate calculator:

Effective Annual Interest Rate Calculator Screenshot

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The Effective Annual Interest Rate (EAR) is the rate of interest actually earned on an investment or paid on a loan as a result of compounding the interest over a given period of time. It is usually higher than the nominal rate and is used to compare different financial products that calculate annual interest with different compounding periods – weekly, monthly, yearly, etc.  Increasing the number of compounding periods makes the effective annual interest rate increase as time goes by.

An investment that is compounded annually will have an effective annual rate that is equal to its nominal rate. However, if the same investment was, instead, compounded quarterly, the effective annual rate would then be higher.

The formula for the EAR is:

Effective Annual Interest Rate = (1 + (nominal interest rate / number of compounding periods)) ^ (number of compounding periods) – 1

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