Cost Calculator AI
Manufacturing & IndustrialOEE Standard

Overall Equipment Effectiveness (OEE) Calculator

Calculate Overall Equipment Effectiveness (OEE) by evaluating Availability, Performance efficiency, and Quality yield against the 85% world-class benchmark.

Overall Equipment Effectiveness (OEE) Factors

Total OEE Score
—%
A × P × Q
Benchmark Rating
—
World-Class is ≥ 85%
Availability Loss
—%
breakdowns & setup
Speed / Defect Loss
—%
slow cycles & scrap

OEE Formula

OEE (%) = Availability (%) × Performance (%) × Quality (%)
  • Availability (%) = Operating Time ÷ Planned Production Time (losses from breakdowns, setups).
  • Performance (%) = (Total Count × Ideal Cycle Time) ÷ Operating Time (losses from slow cycles, minor stops).
  • Quality (%) = Good Count ÷ Total Count (losses from scrap and rework).

Step-by-Step Worked Example

Scenario: Shift evaluation of an automated CNC turning cell

Calculation Steps:

  1. Operating Time = 480 - 48 = 432 minutes
  2. Availability = 432 / 480 = 90.0%
  3. Performance = (24,000 parts × 1s) / (432 min × 60s) = 24,000 / 25,920 = 92.59%
  4. Quality = 22,800 / 24,000 = 95.0%
  5. OEE = 0.90 × 0.9259 × 0.95 = 79.17%
Result: OEE is 79.17% (Typical manufacturing performance), with Availability at 90.0%, Performance at 92.6%, and Quality at 95.0%.

How to Use This Calculator

  1. 1Enter planned shift production time and unplanned downtime minutes.
  2. 2Specify ideal nameplate cycle time in seconds per part.
  3. 3Input total count of parts produced and number of good parts passing quality inspection.

Assumptions & Limitations

  • Planned maintenance and legal breaks are excluded from planned production time.
  • OEE ≥ 85% is recognized globally as World-Class manufacturing performance.

Frequently Asked Questions

What is a typical OEE score in manufacturing?

Typical manufacturing plants average around 60% OEE. An OEE score of 85% is considered world-class for discrete manufacturing, while scores below 50% indicate substantial hidden factory losses.

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