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How to Calculate Interest Expense: Formula & Example

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  • 0:05 Understanding Interest Expense
  • 1:00 Simple Interest Expense
  • 1:59 Compound Interest Expense
  • 3:28 Lesson Summary
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Lesson Transcript
Instructor: Michael Cozad

Michael is a financial planner and has a master's degree in financial services.

This lesson will provide the formula for how to calculate interest expense. This lesson will also explain the phrase and provide a sample calculation.

Understanding Interest Expense

Roberta operates a car detailing business. Unfortunately for Roberta, one of her more expensive machines has recently stopped working. With very little savings, Roberta is contemplating purchasing a new machine with bank financing. That is, she wants to borrow money from a bank to purchase the machine.

Roberta meets with a loan officer from State Bank, who explains to her that interest expense is calculated in one of two ways. Interest expense can easily be explained as the cost of borrowing money or what the bank charges her to borrow the money.

Roberta has decided on a machine with a retail price of $18,290. Since she has already signed loan paperwork, the company sales desk agrees to sell her the machine for $17,000, including all taxes and fees.

Roberta returns to the bank and meets again with the loan officer. He arranges for the check to be sent to the sales desk and begins to explain to Roberta the two types of interest expense formulas.

Simple Interest Expense

The loan officer, Randy, explains that when calculating interest expense, there are three variables: principal, rate, and time. He explains that one way to calculate interest expense is to use the simple interest expense formula. The simple interest expense formula excludes compounding. In other words, interest is not added to the principal. Let's take a look at this formula.

Interest Expense = Principal * Rate * Time

So, if the bank used this formula and Roberta borrowed $17,000 over 5 years at 3%, her total interest expense would be $2,550. Calculating like this:

Interest Expense = $17,000 * 3% * 5

Interest Expense = $17,000 * .15

Interest Expense = $2,550

So, over the life of the loan, Roberta would repay $19,550.

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