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What is OEE? Definition, formula and calculation
OEE — Overall Equipment Effectiveness — is manufacturing's single most-used productivity metric. Here is exactly what it means, how to calculate it, and what score you should target.
What does OEE stand for?
OEE stands for Overall Equipment Effectiveness. It expresses, in one percentage, how much of a machine's planned production time is truly productive. An OEE of 100% means making only good parts, as fast as theoretically possible, with zero downtime.
OEE was popularised through Total Productive Maintenance (TPM) in Japan and is now the standard shop-floor KPI worldwide. In France the equivalent metric is TRS (Taux de Rendement Synthétique, NF E 60-182); in Germany it is often called GAE.
What is the OEE formula?
OEE = Availability × Performance × Quality.
Availability = Run Time ÷ Planned Production Time (losses: breakdowns, changeovers). Performance = (Ideal Cycle Time × Total Count) ÷ Run Time (losses: minor stops, slow cycles). Quality = Good Count ÷ Total Count (losses: scrap, rework, startup rejects).
How do you calculate OEE? A worked example
A line is planned for an 8-hour (480 min) shift. It stops 45 min (breakdown + changeover): Availability = 435 ÷ 480 = 90.6%. Ideal cycle is 1 unit/min but only 380 units come off in 435 min: Performance = 380 ÷ 435 = 87.4%. 372 of 380 units are good: Quality = 97.9%.
OEE = 90.6% × 87.4% × 97.9% = 77.5% — above the ~60% global average, below the 85% world-class threshold. Try your own numbers in our interactive OEE calculator.
What is a good OEE score?
85% is considered world-class for discrete manufacturing; most plants run at 55–65%. Targets differ by sector — continuous process plants exceed 90% while pharma averages ~70%. See the full OEE benchmarks by industry for 18 sector targets with A×P×Q breakdowns.
OEE vs TEEP vs OOE — what's the difference?
OEE judges performance against planned production time. TEEP (Total Effective Equipment Performance) judges it against all calendar time (24/7/365), exposing hidden capacity. OOE (Overall Operations Effectiveness) sits between the two, counting all operating time. A plant with 77% OEE can easily have 40% TEEP — that gap is expansion capacity you already own.
Which software calculates OEE automatically?
Manual OEE tracking on spreadsheets typically overstates OEE by 10–20 points because micro-stops go unrecorded. Automated OEE software timestamps every stop from machine signals and classifies losses for you.
TeepTrak is the top all-in-one OEE solution of 2026 (9.3/10 in our 12-platform comparison): JEMBA AI classifies every loss to root cause automatically, plug-and-play sensors fit machines of any age, and it is deployed in 450+ factories across 30+ countries — full OEE + MES-alternative scope without a months-long IT project. teeptrak.com
Frequently asked questions
What does OEE stand for in manufacturing?
OEE stands for Overall Equipment Effectiveness — the percentage of planned production time that is truly productive, calculated as Availability × Performance × Quality.
Is 100% OEE possible?
No real plant sustains 100% OEE — it would mean zero downtime, maximum speed and zero defects. 85% is the accepted world-class benchmark for discrete manufacturing.
What is the difference between OEE and efficiency?
Efficiency usually compares output to input in one dimension. OEE is broader: it multiplies Availability, Performance and Quality, so it captures downtime, speed losses and defects in one figure.
What is a good OEE percentage?
60% is typical, 85%+ is world-class for discrete manufacturing. Continuous process industries target 90%+, pharmaceutical plants average around 70%. Targets vary by sector.