OEE Calculator
Measure how effectively a machine or line runs. Enter planned time, downtime, ideal cycle time, and unit counts to get OEE and its three components: availability, performance, and quality.
How you compare
📈 Track OEE with production software
Check it outThe three losses
OEE multiplies three rates: Availability (did the machine run when it was scheduled?), Performance (did it run at its ideal speed?), and Quality (were the parts good?). Because they multiply, a line at 90% on each scores only about 73% OEE — which is why world-class is often cited near 85%. Breaking the score into its parts shows where to focus: downtime, speed, or defects.
How it’s calculated
OEE = Availability × Performance × Quality, where availability = run ÷ planned time, performance = ideal output ÷ run time, quality = good ÷ total units.
Results update as you type and are estimates, not professional advice — verify important decisions with a qualified professional.
Worked example
480 planned minutes with 60 down, a 30s ideal cycle and 760 good of 800 units is ~79% OEE (87.5% / 95.2% / 95%).
Common mistakes
- Comparing OEE without looking at the three components.
- Setting an ideal cycle time that is too slow.
Where it is used
- Measuring a line or machine's effectiveness.
- Finding whether downtime, speed, or quality is the issue.
Frequently asked questions
What's a good OEE?
85% is often cited as world-class for discrete manufacturing; 60% is typical. The components matter more than the headline number.
Why can performance exceed 100%?
Usually a sign the 'ideal' cycle time is set too slow. Update it to the true best-case to keep the metric meaningful.
What is planned production time?
Scheduled run time minus planned stops like breaks. Unplanned downtime is then subtracted to get actual run time.
Get the free Calculator Pack
One email with our most-used spreadsheets and new calculators. No spam.
Thanks! Check your inbox to confirm. (Demo form — connect to your email tool.)