OEE calculator
Calculate Overall Equipment Effectiveness from planned time, downtime, ideal cycle time and part counts.
How it is calculated
Availability = run time ÷ planned time. Performance = ideal cycle × total parts ÷ run time. Quality = good ÷ total. OEE = A × P × Q.
Worked example
480 min planned, 60 min down, 0.5 min cycle, 700 made, 680 good: A 87.5 %, P 83.3 %, Q 97.1 %, OEE 70.8 %.
Steps
- Enter planned time and downtime.
- Enter ideal cycle time from the process spec.
- Enter total and good parts for the shift.
Frequently asked questions
What is a good OEE?
Around 85 % is world-class in discrete manufacturing; many plants run 60 to 70 %.
Is planned time the shift length?
Use planned production time, which excludes scheduled breaks.
Does scrap count as quality loss?
Yes, only good parts count in quality.
References
OEE definition from Nakajima (TPM) and common practice in ISO 22400 KPI definitions.
Estimates for information only. Verify critical values with a qualified engineer or your supplier standards.