Simple Interest Calculator

Calculate the interest earned on a principle amount over a specific period of time.
Investment Details
Investment Period
Years
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Whats is Simple Interest ?

Simple interest is a type of interest calculation where the interest is calculated only on the principal amount of a loan or investment. It is a straightforward method of calculating interest and does not take into account any compounding, which is the process of adding interest to the principal amount and then calculating interest on both the principal and accumulated interest.

The formula for calculating simple interest is as follows:

Simple Interest = Principal x Rate x Time

Where:

  • Principal: The original amount of money borrowed or invested.
  • Rate: The interest rate expressed as a decimal.
  • Time: The length of time the money is borrowed or invested, usually expressed in years.

For example, if you borrow $1,000 at a simple interest rate of 5% per year for 3 years, the total interest you would pay is:

Simple Interest = (1,000 x 5 x 3)/100
Simple Interest = $150

So, you would have to pay back a total of $1,150 at the end of the 3-year period.

Author Information

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Rajesh V U

Full-Stack Developer & Storage Technologist | Creator of UnitSmash.com
Last updated: June 1, 2026

I am a Storage Technologist with strong experience in enterprise storage systems, Angular development, and web-based tools. I enjoy building practical calculators, converters, and utilities, and I also create original cartoons. I share my tools, articles, and creative work on my personal website, rajeshvu.com.