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.

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## 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:

- First, determine the total interest earned ($).
- The total interest earned ($) is given as: 3,000.

- Next, determine the total investment amount ($).
- The total investment amount ($) is provided as: 10,000.

- 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** = ?**