Compound Interest Calculator

Compound Frequency

Initial Investment

Interest Rate


Length of Time


Compound Interest


Compound Amount


What is Compound Interest Calculator?

A Compound Interest Calculator is an online tool that helps you estimate the future value of your investment based on the initial investment amount, interest rate, period of investment, and compounding frequency. Compound interest is the interest earned on both the initial investment and any interest earned on that investment, which can help your investment grow exponentially over time. By using a Compound Interest Calculator, you can see how much your investment can grow over time with the power of compounding.

How to use Compound Interest Calculator?

To use a Compound Interest Calculator, follow these simple steps:

  1. Choose Compound Frequency: The first step is to choose the frequency at which your interest is compounded - annually, semi-annually, quarterly or monthly. This determines how often the interest is added to the principal amount.
  2. Enter Initial Investment: In the next step, enter the initial investment or the principal amount. This is the amount that you are investing or the amount that you have borrowed.
  3. Enter Interest Rate: Enter the interest rate per annum as a percentage. This is the rate at which your investment will grow or the interest rate that you are being charged for the loan.
  4. Enter Duration or Length of Time: In the next step, enter the duration or length of time for which you are investing or the loan tenure. This is the time period over which the investment or loan is spread.
  5. Get Result: After entering all the required details, the Compound Interest Calculator will provide you with the future value of your investment, including the compound interest, based on the information you have entered.

Compound Interest Formula and Calculation with Example

The formula for calculating compound interest is:
CI = P(1 + R/100)^T - 1
CA = P + CI

CI = Compound Interest
CA = Compound Amount
P = Principal Amount
R = Rate of Interest per year as a percent
T = Time Period involved in years

Here's an example of how to calculate compound interest:
Suppose you invest $10,000 for 5 years at an interest rate of 8% per annum, compounded annually. Using the formula above, we can calculate the compound interest earned and the total amount you will have at the end of the 5-year period.
P = $10,000
R = 8%
T = 5 years

CI = P(1 + R/100)^T - P
CI = $10,000(1 + 8/100)^5 - $10,000
CI = $4,661.28

The compound interest earned over the 5-year period is $4,661.28. To calculate the total amount you will have at the end of the 5-year period, we need to add the compound interest to the principal amount.
CA = P + CI
CA = $10,000 + $4,661.28
CA = $14,661.28

So the total amount you will have at the end of the 5-year period is $14,661.28.

Power of Compounding with Period, Total Invested Amount, Value of Investment

Period Total Invested Amount Value of Investment
1 year $10,000 $10,500
5 years $50,000 $64,584
10 years $100,000 $162,889
20 years $200,000 $732,891
30 years $300,000 $1,743,304

Note: The above table assumes a fixed annual interest rate of 5% and does not take into account fluctuations in the market or any taxes or fees. The actual returns may vary depending on the investment vehicle and other factors. This table is for illustrative purposes only and should not be taken as financial advice.

Differences between Simple Interest and Compound Interest

Differences Simple Interest Compound Interest
Calculation Method Calculated only on the principal amount Calculated on the principal amount as well as the accumulated interest
Frequency of Interest Payment Typically paid at the end of the term Typically paid at regular intervals such as monthly, quarterly or annually
Effect on Earnings Earnings are fixed and predictable Earnings can vary based on the frequency of compounding and the interest rate
Application Used for short-term loans or investments Used for long-term loans or investments
Formula Simple Interest = (Principal x Rate x Time) / 100 Compound Interest = Principal x (1 + (Rate/n))^(n x Time)
Example If you borrow $10,000 at 5% per annum for 2 years, the interest would be $1,000 ($10,000 x 5% x 2) If you invest $10,000 at 5% per annum compounded annually for 2 years, the interest would be $1,050.63 ($10,000 x (1 + (5%/1))^(1 x 2))

Benefits of using Compound Interest Calculator

  • User-friendly interface: The Compound Interest Calculator at has a simple and user-friendly interface, making it easy for anyone to use, even those with limited financial knowledge.
  • Customizable variables: The calculator allows users to customize variables such as the principal amount, interest rate, compounding frequency, and investment period, making it easy to calculate the compound interest for different scenarios.
  • Accurate results: The calculator uses a precise formula to calculate the compound interest, ensuring that the results are accurate and reliable.
  • Time-saving: The calculator provides instant results, saving time and effort in manual calculations.
  • Investment planning: The calculator helps in investment planning by providing an estimate of the future value of an investment based on the variables selected.
  • Investment decision-making: The calculator provides a clear picture of the expected returns on an investment, making it easier to make informed investment decisions.
  • Educational value: Using the calculator can help enhance knowledge about financial concepts like interest rates, investment periods, and compounding frequencies.
  • Free to use: The Compound Interest Calculator at is completely free to use, with no hidden fees or charges.

Limitations of using Compound Interest Calculator

  • Assumption of fixed interest rate: The calculator assumes a fixed interest rate throughout the investment period, which may not always be the case in real-world scenarios.
  • No consideration for inflation: The calculator does not take into account the impact of inflation on the investment returns, which can affect the real value of the returns.
  • Limitations in compounding frequency: The calculator may have limitations in the compounding frequency options, which may not be suitable for certain investments.
  • No consideration for taxes: The calculator does not factor in the impact of taxes on the investment returns, which can affect the actual returns received.
  • Limitations in input options: The calculator may have limited input options, which may not allow for customization of certain variables that may affect the investment returns.
  • Estimation-based results: The calculator provides estimation-based results, which may not always be accurate, especially when the investment period is long or the interest rate changes frequently.
  • No guarantee of future returns: The calculator cannot guarantee the future returns on the investment, as they are subject to market fluctuations and other external factors.
  • Does not consider fees and charges: The calculator does not take into account any fees and charges associated with the investment, which can affect the actual returns received.

Frequently Asked Questions

What is compound interest?

Compound interest is the interest that is earned on the principal amount as well as the accumulated interest of a loan or investment.

What is the effect of compounding frequency on the interest earned?

The interest earned increases with an increase in the compounding frequency. For example, if the interest is compounded quarterly instead of annually, the interest earned will be higher.

Is compound interest better than simple interest?

In most cases, compound interest is better than simple interest because it allows for the growth of the investment over time. However, it depends on the specific circumstances and goals of the investor or borrower.

What is the Rule of 72 in compound interest?

The Rule of 72 is a simple way to estimate how long it will take for an investment to double in value based on the interest rate. You can calculate the number of years it will take to double your investment by dividing 72 by the interest rate.

What is the power of compounding?

The power of compounding refers to the ability of an investment to generate earnings that are reinvested to generate even more earnings. Over time, this can lead to significant growth in the investment.

How often is compound interest usually calculated?

Compound interest can be calculated at different frequencies, such as annually, semi-annually, quarterly, or monthly, depending on the investment or loan terms.

Can compound interest be negative?

Yes, compound interest can be negative if the interest rate is negative or if the investment loses value over time.

What are some examples of compound interest in real life?

Some examples of compound interest in real life include savings accounts, investments in stocks and mutual funds, and mortgages. In each case, the interest earned or paid is compounded over time, resulting in higher earnings or higher payments.

How many times can I use the Calculator?

You can use the Compound Interest Calculator as many times as you like.

Is compound interest available in banks?

Yes, compound interest is available in banks for various financial instruments such as fixed deposits and savings accounts. The frequency of compounding and the interest rates may vary between banks and financial instruments.

What is time value of money?

The time value of money refers to the concept that the value of money changes over time due to factors such as inflation and the earning potential of investments.

How does Compound Interest grow over time?

Compound interest grows exponentially over time, as the interest earned on the accumulated interest is added to the principal amount, resulting in higher returns.