Simple Interest Calculator

Simple Interest Calculator

Simple Interest Calculator

Simple Interest: 0

Final Value: 0

Simple Interest Calculator User Guide


This web-based tool that allows you to calculate the simple interest and the final value of an investment or loan. It’s a straightforward tool that requires you to input the principal amount, annual interest rate, and the time period, and it will provide you with the calculated simple interest and the final value of your investment or loan.

Using the Calculator

  1. Enter the Principal Amount:In the “Principal amount” field, input the initial amount of money you are investing or loaning. This is the amount on which the interest will be calculated.
  2. Enter the Annual Interest Rate:
    • In the “Annual interest rate (%)” field, input the annual interest rate as a percentage. For example, if the interest rate is 5%, you should enter 5.
  3. Enter the Time Period (in years):
    • In the “Time period (years)” field, input the number of years you will keep the money invested or the loan duration.
  4. Calculate Simple Interest:
    • After you’ve entered all the required information, click the “Calculate” button. The calculator will compute and display the simple interest and final value.
  5. View Results:
    • The calculator will display the following results:
      • Simple Interest: This is the amount of interest earned or paid.
      • Final Value: This is the total amount you will have at the end of the investment or loan term, including the principal and interest.


Let’s consider an example:

  • Principal Amount: $10,000
  • Annual Interest Rate: 5%
  • Time Period: 3 years
  1. Enter $10,000 in the “Principal amount” field.
  2. Enter 5 in the “Annual interest rate (%)” field.
  3. Enter 3 in the “Time period (years)” field.
  4. Click the “Calculate” button.

The calculator will show the results:

  • Simple Interest: $1,500
  • Final Value: $11,500

Resetting the Calculator

You can reset the calculator by simply refreshing the web page or clicking the “Reset” button on your browser.

Important Notes

  • Make sure to enter numerical values in the fields, and ensure that the input is valid (e.g., positive numbers for principal and time, and a valid percentage for the interest rate).
  • The calculator assumes simple interest, so it may not be suitable for more complex interest calculations.


The Simple Interest Calculator is a handy tool for quickly determining the simple interest and final value of your investments or loans. It’s easy to use and provides quick results for your financial calculations.