Compound Interest Calculator

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


Compound interest is earned on both the principal amount and the accumulated interest. It is calculated by multiplying the interest rate by the account balance at the end of each compounding period. This means that the interest earned each period is added to the principal, so the account balance grows at an increasing rate.

The formula for calculating compound interest is:

A = P(1 + r/n)^nt


  • A is the future value of the investment
  • P is the principal amount invested
  • r is the annual interest rate
  • n is the number of times interest is compounded per year
  • t is the number of years the money is invested

For example, if you invest $1,000 at an annual interest rate of 5% compounded annually for 10 years, the future value of your investment will be $1,610.51. This is because the interest earned each year will be added to the principal so that the account balance will grow at an increasing rate.


There are several benefits to using a compound interest calculator:

  • Accuracy: Compound interest calculators are very accurate. They can calculate compound interest with a high degree of precision.
  • Convenience: Compound interest calculators are very convenient to use. They are available online and can be used anywhere with an internet connection.
  • Speed: Compound interest calculators can perform calculations very quickly. This can be helpful for students, investors, and other professionals who need to calculate compound interest regularly.

Interesting facts

Here are some interesting facts about compound interest:

  • Albert Einstein reportedly called compound interest “the eighth wonder of the world.”
  • Compound interest has been used for centuries to finance businesses, governments, and individuals.
  • The power of compound interest can be seen in the stock market, where long-term investors have historically earned an average annual return of around 10%.


Here are some scholarly references on compound interest:

  • Financial Mathematics by Mark J. Rubinstein and Michael S. Kaplan (2010)
  • Investments by Bodie, Kane, and Marcus (2011)
  • The Mathematics of Money Management by Ralph Vince (2011)


Compound interest calculators are used in a variety of applications, including:

  • Finance: Compound interest calculators are used to calculate the future value of investments, the amount of interest earned on loans, and the monthly payments for mortgages and other loans.
  • Business: Compound interest calculators are used to calculate the cost of capital, the value of future cash flows, and the profitability of investments.
  • Education: Compound interest calculators are used in education to teach students about the concept of compound interest and to help them plan for their future.
  • Other applications: Compound interest calculators are also used in various other applications, such as real estate, retirement planning, and personal finance.


Compound interest calculators are a valuable tool that can be used in various applications. They are accurate, convenient, and fast. If you need to calculate compound interest, use a compound interest calculator.

Here are some additional examples of how compound interest calculators can be used:

  • A student can use a compound interest calculator to estimate the future value of their college savings.
  • An investor can use a compound interest calculator to compare the returns of different investments.
  • A business owner can use a compound interest calculator to estimate the cost of financing a new project.
  • A homeowner can use a compound interest calculator to calculate the monthly payments for a mortgage.
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