Effective Annual Rate Calculator (EAR)

Enter the annual interest rate and the compounding time period on a loan to calculate the effective annual interest rate of the loan.

What is EAR?

EAR is a financial term that stands for the effective annual rate. EAR is used to describe an interest on a loan or mortgage in terms of compounding annual interest rates. In other words it converts the nominal interest rate to a compounding interest rate.

EAR Formula

The following formula is used to calculate the effective annual interest rate of a loan.

  • r is the nominal annual interest rate (%)
  • i is the effective annual rate (%)
  • m is the number of compounding periods per year

How to calculate EAR?

The following example is a step by step guide to calculating the EAR of a loan.

  1. The first step in calculating the EAR of a loan is to determine the nominal interest rate on the loan. This is typically provided when agreeing to terms of a loan. For this example we will say the interest rate is 3.5% yearly.
  2. The next step to determine the compounding periods before year. Must often the compounding period is monthly. In other words, there would be 12 compounding periods per year. Sometimes these could be compounding weekly or even daily. Those types of terms need to be looked out for when agreeing to a loan. For this example we will say the compounding period is the typically monthly period.
  3. The final step is to plug these values into the formula above and solve. You may also simply plug the values into the calculator above and we find the effect annual rate to be 3.556%. As you can see not much change with only monthly compounding periods.
ear calculator

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