Compound Interest Calculator

  • Enter the Principal Amount, Annual Interest Rate, Time (in years), Compounding Frequency, and Monthly Contributions.
  • Click "Calculate" to calculate the compound interest and display the results.
  • View the detailed calculation and formula used in the "Calculation Details" section.
  • Your calculation history will appear in the "Calculation History" section.
  • Use "Clear" to reset the form and "Copy Results" to copy the results and calculations.
Investment Growth Chart

What is Compound Interest?

Compound interest is a financial concept that refers to the interest earned or paid on both the initial principal (the initial amount of money) and any accumulated interest from previous periods. In other words, it’s interest that is calculated on the initial amount of money, as well as on any interest that has already been earned or incurred.

All Formulae Related to Compound Interest

  1. Future Value (A) of an Investment or Loan with Compound Interest:The future value of an investment or loan that compounds interest is calculated using the formula:A = P * (1 + (r/n))^(n*t)Where:
    • A is the future value of the investment or loan, including both the principal and interest.
    • P is the principal amount (the initial amount of money).
    • r is the annual interest rate (expressed as a decimal).
    • n is the number of times that interest is compounded per year.
    • t is the number of years the money is invested or borrowed for.
  2. Principal (P) Calculation:To find the principal amount (the initial amount of money) needed to achieve a specific future value (A) with compound interest, you can rearrange the formula as follows:P = A / [(1 + (r/n))^(n*t)]
  3. Interest Earned (I) Calculation:The interest earned on an investment with compound interest can be calculated using the formula:I = A – PWhere I is the interest earned, A is the future value, and P is the principal amount.
  4. Effective Annual Rate (EAR) Calculation:The effective annual rate is a measure of the true annual interest rate when interest is compounded multiple times within a year. It is calculated as follows:EAR = (1 + (r/n))^n – 1Where EAR is the effective annual rate, r is the nominal annual interest rate, and n is the number of times interest is compounded annually.

Applications of Compound Interest Calculator in Various Fields

Compound interest calculators are valuable tools used in various fields and financial situations where the calculation of compound interest is required. Here are some common applications of compound interest calculators in different fields:

  1. Finance and Investment:
    • Investors use compound interest calculators to estimate the growth of investments, including savings accounts, stocks, bonds, and retirement funds, over time.
  2. Banking and Personal Finance:
    • Individuals and banks use compound interest calculators to determine the future value of savings accounts, certificates of deposit (CDs), and other financial products.
  3. Loans and Mortgages:
    • Borrowers and lenders use compound interest calculators to assess the cost of loans, such as personal loans, auto loans, and mortgages, by calculating the total interest paid over the loan term.
  4. Retirement Planning:
    • Individuals and financial advisors use compound interest calculators to project the future value of retirement savings and ensure that retirement goals are met.
  5. Education Planning:
    • Parents and students use compound interest calculators to estimate the amount needed to save for education expenses, including college and university tuition.

Benefits of Using the Compound Interest Calculator

Here are the key benefits of using a compound interest calculator:

  1. Accurate Results: Compound interest calculators provide precise and accurate calculations, eliminating the risk of manual computation errors.
  2. Time Savings: Calculating compound interest manually can be time-consuming, especially for long investment horizons. Compound interest calculators provide results instantly, saving time and effort.
  3. Financial Planning: Individuals can use compound interest calculators to plan their financial future, including retirement savings, education funds, and long-term investments.
  4. Investment Evaluation: Investors can assess the potential returns of various investment opportunities, helping them make informed decisions about where to allocate their funds.
  5. Loan Analysis: Borrowers can determine the total cost of borrowing, including interest payments, by using compound interest calculators for loans and mortgages.
  6. Goal Setting: Compound interest calculators assist individuals in setting and tracking financial goals, such as saving for a down payment on a house or a dream vacation.


  1. “Beyond Savings Accounts: Unveiling the Power of Compound Interest in Investment Strategies” by Journal of Financial Planning
  2. “From Economic Growth to National Debt: Understanding the Role of Compound Interest in Macroeconomic Analysis” by American Economic Journal: Macroeconomics

Last Updated : 27 February, 2024

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