While our OEE calculator helps you estimate your OEE, and our OEE software track and improve it, this article explains how to calculate OEE and its components in detail. We will look at the formulas and explain the calculations using examples.

The Three Components of OEE Calculation

While you can find many different articles in our OEE fundamentals section about the importance of OEE and how to apply it, our aim here is to look at calculating OEE in more detail.

We’ll present you with the formulas you need to understand together with calculation examples that are based on the default values in our OEE calculator. By the time you finish this article, you will know exactly how to calculate OEE.

If you have any questions about the formulas or explanations, don’t hesitate to get in contact with our team.

In this article, you will find:

Availability Formula Explained

Availability is essentially the time that your machines are actually working, as a percentage of scheduled working time.

Availability explained visually

To calculate equipment/machine Availability, the actual working time is divided by all scheduled time for the same period to get the proportion and multiplied by 100 to express the value in percentages:

Availability formula

You already know your scheduled working time, but how do you find out your actual working time?

Availability formula

To do that, you register all stops (downtime) and subtract them from all scheduled working time.

Availability formula

Performance Formula Explained

To calculate performance, you need to find out how many products you produce, and how it compares to the number of products that you could produce at maximum speed during your actual (not all scheduled, but actual) working time.

Performance explained visually

The formula of the Performance component of OEE is:

Performance formula

You already know how many products you produce (keep in mind, these are all products, including scrap), but how do you find out how many you could produce?

Performance formula

To do that, you simply multiply your actual working time and your maximum production speed.

Performance formula

How do you find out your maximum production speed?

Sometimes the manufacturer of the machine specifies it (alternative terms – “nameplate”, or “ideal cycle time”). If not, you can identify the fastest recorded time by looking at historical performance and then calculate how many products you would make if your machines were constantly running at that speed.

If you don’t have this data, we highly recommend implementing an OEE system that does these calculations for you and gives you the data you need to manage OEE effectively.

Quality Formula Explained

Simply put, quality shows the portion of good products among all products.

Quality explained visually

The formula for Quality is:

Quality formula

“All products” is simply good products + scrapped + reworkable products.

Quality formula

Combine All 3 Components for the OEE Calculation Formula

If you multiply all OEE components with each other, you will get the OEE value.

Alternative OEE formula

Even though there is a simpler way to calculate OEE, this formula is also helpful. You could use it to find out a missing OEE component if you know the other values. For example, if you know your OEE, Performance, and Quality, then you can find out Availability like this:

Availability calculation from alternative OEE formula

Here is the interactive visualization of this formula:

Availability %
Performance %
Quality %
OEE = % x % x % = %

This graph is interactive! (drag the dashed --- lines)

Excel Template for OEE Calculation

If you want to calculate your OEE using Excel, then open our Excel template for OEE calculation and input your numbers. If you have questions regarding the Excel template, then don’t hesitate to contact our team.

Implement OEE with Evocon

And get most out of your production data.

Get started

Related articles

Subscribe to our newsletter

"*" indicates required fields

Consent*