OEE Calculator
Overall Equipment Effectiveness for a shift: availability, performance, quality, OEE, and where the time went.
Three ratios,
one honest number.
And the trap that makes OEE look better than it is.
Availability × Performance × Quality
Planned production time is the shift minus scheduled breaks. Availability = run time ÷ planned time, where run time is planned time minus every unplanned and planned stop. Performance = (ideal cycle time × total pieces) ÷ run time — how close the machine ran to its best-demonstrated speed. Quality = good pieces ÷ total pieces, counting rework as not good. OEE is the product; a fully productive minute is one at ideal speed making good parts.
Where the time went
The same figures give a time budget: downtime loss (the stops), speed loss (run time minus the time the pieces should have taken), quality loss (the ideal time spent on rejects), and fully productive time. The four always add up to planned time, which makes the biggest loss obvious. 85 % is the usual “world class” benchmark for discrete manufacturing; typical plants sit around 60 %, so the gap in pieces is shown rather than only the percentage.
The ideal cycle time trap, and TEEP
If the ideal cycle time is set to what the machine usually does rather than the fastest it can run, performance floats above 100 % and speed losses vanish. The utility warns when that happens. TEEP (total effective equipment performance) is OEE scaled by planned time ÷ calendar time, for the question “how much of all available time is productive”. Nothing you enter is stored; the same four anonymous usage counts as the rest of the site apply.