OEE Calculator (Overall Equipment Effectiveness)

How it works

Availability = run time ÷ planned production time; Performance = (ideal cycle time × total count) ÷ run time; Quality = good count ÷ total count; OEE = A × P × Q = (ideal cycle time × good count) ÷ planned production time

OEE condenses how well a machine or line uses its planned production time into one percentage by multiplying three factors: availability (how much of the planned time it actually ran), performance (how close it ran to its ideal speed while running) and quality (how much of what it made was right first time). The product equals fully productive time divided by planned time, and the three factors map onto the six big losses — breakdowns and setups, minor stops and slow cycles, start-up rejects and production rejects — so the split tells you where to look. Scores around 60% are typical for discrete manufacturing and 85% is considered world class; the difference is capacity you already paid for. Consistency matters more than precision: use the same ideal cycle time and planned-stop rules every shift so trends are real.

Worked example

A 480-minute shift with 60 minutes of breaks (420 planned) loses 47 minutes to stops: availability 88.8%. The machine makes 19,271 pieces in 373 minutes at a 1.0 s ideal cycle: performance 86.1%. 423 rejects: quality 97.8%. OEE = 74.8%; about 6,300 pieces of possible output were lost.

Frequently asked questions