Effective Annual Rate (EAR) Calculator

  • Enter the Nominal Interest Rate and Compounding Frequency.
  • Click "Calculate EAR" to calculate the Effective Annual Rate (EAR).
  • Your calculation history will be displayed below.
  • Click "Clear Results" to reset the inputs and results.
  • Click "Copy Results" to copy the EAR to the clipboard.

Calculation Details

The Effective Annual Rate (EAR) is calculated using the following formula:

EAR = (1 + (Nominal Rate / Compounding Frequency)) ^ Compounding Frequency - 1


  • Nominal Rate: The nominal interest rate in percentage.
  • Compounding Frequency: The number of times interest is compounded per year.

The formula calculates the annual interest rate that takes into account the effect of compounding over the year.

Calculation History

    The effective annual rate (EAR), also known as the equivalent annual rate (AER) or the annualized percentage rate (APR), is a crucial concept in finance that represents the true cost of borrowing or the true return on an investment over a one-year period. It considers the compounding effect of interest, which is when interest is earned on previously earned interest. EAR is used to compare different investment or loan options that have different compounding periods, such as daily, monthly, or quarterly compounding.

    Concepts and Formulae

    The EAR formula accounts for the number of compounding periods within a year to determine the true annual interest rate. The formula is:

    EAR = (1 + (i/n))^(n) - 1


    • i is the nominal interest rate (the stated interest rate)
    • n is the number of compounding periods per year
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    For example, if you have a loan with a nominal interest rate of 10% and monthly compounding, the EAR would be:

    EAR = (1 + (0.10/12))^(12) - 1 = 0.1047

    This means that the true annual interest rate of your loan is 10.47%.

    Benefits of Effective Annual Rate

    Understanding EAR offers several benefits:

    1. Comparing Borrowing Costs: EAR allows for accurate comparison of borrowing costs from different lenders or different loan options with varying compounding periods. This enables borrowers to make informed decisions based on the true annual cost of borrowing.
    2. Evaluating Investment Returns: EAR provides a standardized metric for comparing the returns of different investments, especially those with different compounding frequencies. This helps investors make informed decisions about where to allocate their funds.
    3. Accounting for Compounding Effect: EAR takes into account the compounding effect of interest, which is overlooked when comparing interest rates with different compounding frequencies. This ensures a more accurate representation of the true annual cost or return.
    4. Financial Analysis and Decision-Making: EAR plays a crucial role in financial analysis and decision-making, such as evaluating the affordability of loans, assessing investment performance, and determining optimal investment strategies.
    5. Consumer Protection Regulations: EAR is used in consumer protection regulations to ensure that borrowers are aware of the true cost of credit and can make informed borrowing decisions.

    Facts about Effective Annual Rate

    1. EAR is not always equal to the nominal interest rate. The difference between EAR and the nominal interest rate increases as the compounding frequency increases.
    2. EAR is a more accurate representation of the true annual interest rate. It reflects the compounding effect and provides a standardized basis for comparison.
    3. EAR is used in various financial transactions. It is commonly used in loan agreements, investment contracts, and consumer credit disclosures.
    Also Read:  Impulse Momentum Calculator


    1. Financial Instruments and Institutions by Bruce E. Fuqua (2018)
    2. Corporate Finance by Stephen A. Ross, Randolph W. Westerfield, and Bradford D. Jordan (2018)
    3. Fundamentals of Investments by Bodie, Kane, and Marcus (2018)


    The effective annual rate is a fundamental concept in finance that provides a true representation of the annual cost of borrowing or the true return on an investment. It is essential for making informed financial decisions, comparing different investment or loan options, and understanding the impact of compounding. By understanding the principles of EAR and its applications, individuals can enhance their financial literacy and make sound financial choices.

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