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Compound Interest

Compound interest is a powerful concept that helps your money grow over time. Unlike simple interest, which is calculated only on the initial principal, compound interest allows you to earn interest on both your original investment and the interest that accumulates. The more frequently interest is compounded, the faster your investment will grow.
 

Our calculator will help you understand how your investment can grow over time based on the principal, interest rate, compounding frequency, and any additional contributions you make. Try it out to see how compound interest works and how it can benefit your savings or investment plans!

Field Explanations

 

Input

  • Principal Amount ($): The initial amount you’re investing or saving, which forms the base for earning interest.

  • Number of Years: The length of time your investment will grow, typically measured in years.

  • Annual Interest Rate (%): The yearly percentage rate that your investment will earn, used to calculate compound interest.

  • Compound Frequency: How often interest is added to your investment. Options typically include monthly (12 times a year) or annually (once a year).

  • Contribution ($): The regular amount you plan to add to your investment, like monthly or yearly contributions.

  • Contribution Frequency: How often your contributions will be made, such as monthly or annually.

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Output

  • Future Value ($): The estimated value of your investment at the end of the specified time, including both the principal and interest.

  • Total Principal ($): The sum of your initial investment and all your regular contributions.

  • Total Interest ($): The total amount of interest earned on your investment, excluding your initial principal and regular contributions.

How the Calculator Works

The calculator uses the compound interest formula to compute the future value of the investment:

The Formula:

Where:

Compound interest formula showing principal, interest rate, time, and frequency of compounding, used to calculate investment

FV = Future Value

P = Principal (Initial investment)

r = Annual interest rate

n = Number of compounding periods per year

t = Number of years

PMT = Periodic contribution

m = Contribution frequency (monthly, annually, etc.)

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Last updated: [3/21/2025]

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