How to Calculate Performance for OEE Overall Equipment Effectiveness.

What is performance score and how to calculate OEE


In this article, you will learn what is performance score and how to calculate performance for OEE Overall Equipment Effectiveness on lean manufacturing activities.

Performance score, or Performance Loss Definition

The performance score is a metric that takes into account the following 3 factors during the manufacturing process:

  1. idling,
  2. minor stops and
  3. reduced speed.

A Performance score of 100% means when the process or machine is running as fast as possible at the maximum speed without stopping or pauses. How to Calculate Performance for OEE

The low-performance score should be related to unexpected shutdowns or machinery breakdowns associated with a specific part or preventive maintenance tasks, such as poor lubrication or components too old or that need to be replaced.

The performance score (also called a Performance loss) is one of the three OEE Losses, which includes Availability scores and Quality scores.

The OEE formula is considering the multiplication of the availability score, performance score, and quality score and is represented by a percentage.

OEE = Performance Score  x  Availability Score Quality Score

How to Calculate the Performance Score in 5 Steps?


Here is the example data recorded for the first shift:

  • Shift Length = 8 hours (470 minutes)
  • Breaks = 60 minutes
  • Downtime = 40 minutes
  • Ideal Cycle Time = 1.0 seconds per product
  • Total Count = 10,000 products

Step 1. Calculate the Planned Production Time.

The performance calculation begins with Planned Production Time. How to Calculate Performance for OEE

To calculate the planned production time, let’s subtract the break time from any shift time.

Formula: Shift Length − Breaks

Example: 470 minutes − 60 minutes = 410 minutes

Step 2. Calculate the Run Time.

Then let’s calculate the run time. How to Calculate Performance for OEE

Run time Formula: Planned Production Time – Downtime or Stop Time.

Example: 410 minutes − 40 minutes = 370 minutes.

Run time = 370 minutes.

Step 3. Calculate the Performance using Run Time.

Formula: (Ideal Cycle Time × Total Count) / Run Time.

Example: (1.0 seconds × 10,000 Products) / (370 minutes × 60 seconds) = 0.45045 (45%) Performance Score.

Step 4. Calculate the Ideal Run Time.

Performance can also be calculated based on Ideal Run Rate. How to Calculate Performance for OEE

Ideal Run Rate – Theoretical maximum production rate considering the inverse of Ideal Cycle Time.

Used to calculate OEE Performance. A variation of the calculation uses Ideal Cycle Time instead.

If the Ideal Cycle Time is 1.0 seconds, then the equivalent Ideal Run Rate in this example is:

Ideal Run Rate = 1 product per second or 60 products per minute.

Step 5. Calculate the Performance using Ideal Run Time.

Performance Formula: (Total Count / Run Time) / Ideal Run Rate. How to Calculate Performance for OEE

Example: (10,000 products / 370 minutes) / 60 products per minute = 0.45045 (45%) Performance Score.

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REFERENCES: How to Calculate Performance for OEE.




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Ramon Cayuela, MS, BS, Chemical Engineering

CIQA President and CEO.
I've been working in validation engineering since 1992 with many multinational pharmaceutical companies. I love sharing my passion and knowledge with others. If you have any questions about anything (or just have general questions). I will be more than happy to assist you. You can count on the BEST customer service on CIQA. I go to great lengths to make sure my clients are 100% satisfied with their purchases and check emails/messages consistently throughout the day. You can rest assured that everything being sold here is as-described or your money back. I look forward to working with you!