Enter the total interest earned ($) and the total investment amount ($) into the Return on Interest Calculator. The calculator will evaluate and display the Return on Interest. 

Return on Interest Formula

The following formula is used to calculate the Return on Interest. 

ROIn = IE / IA * 100

  • Where ROIn is the Return on Interest (%)
  • IE is the total interest earned ($) 
  • IA is the total investment amount ($) 

How to Calculate Return on Interest?

The following example problems outline how to calculate Return on Interest.

Example Problem #1:

  1. First, determine the total interest earned ($). 
    • The total interest earned ($) is given as: 3,000.
  2. Next, determine the total investment amount ($). 
    • The total investment amount ($) is provided as: 10,000.
  3. Finally, calculate the Return on Interest using the equation above: 

ROIn = IE / IA * 100

The values given above are inserted into the equation below and the solution is calculated:

ROIn = 3,000 / 10,000 * 100 = 30.00 (%)


Example Problem #2: 

For this problem, the variables needed are provided below:

total interest earned ($) = 6,000

total investment amount ($) = 30,000

This example problem is a test of your knowledge on the subject. Use the calculator above to check your answer. 

ROIn = IE / IA * 100 = ?