How it's calculated

Availability = (Planned time − Downtime) ÷ Planned time Performance = (Ideal cycle time × Total count) ÷ Run time Quality = Good count ÷ Total count OEE = Availability × Performance × Quality

Planned production time excludes planned breaks and no-demand time; those are not losses. A commonly quoted world-class benchmark is 85%, while many plants run at 40–60%. Your own trend on the same line matters more than any benchmark.

Common mistakes

Using today's typical speed as the ideal cycle time. The ideal is the fastest the machine is designed to run. A generous figure hides speed losses.
Counting planned maintenance as downtime on some days and not others. Pick a rule and apply it consistently.