Lean Manufacturing OEE Calculator
Overall Equipment Effectiveness (OEE) is the gold standard metric for measuring manufacturing productivity. OEE = Availability x Performance x Quality. A world-class OEE of 85% requires all three components to be high: typical benchmarks are 90% availability, 95% performance, and 99.9% quality. Enter actual or estimated values for your operation to calculate OEE.
OEE formulas (SEMI E10)
Availability (%) = ((Planned time - Downtime) / Planned time) x 100
Performance (%) = (Total units x Ideal cycle time / (Planned time - Downtime)) x 100
Quality (%) = (Good units / Total units) x 100
OEE (%) = Availability x Performance x Quality / 10,000
Formulas are per SEMI E10 Specification for Definition and Measurement of Equipment Reliability, Availability, Maintainability, and Productivity.
OEE benchmarks
- World class: OEE above 85% (Availability 90%, Performance 95%, Quality 99.9%)
- Good: OEE 65-85% (typical for most facilities with active improvement programs)
- Average: OEE 40-65% (many facilities start here; significant opportunity for improvement)
- Below 40%: Large immediate losses; immediate focus on availability is usually the highest priority.
OEE: frequently asked questions
What is the OEE formula?
OEE = Availability x Performance x Quality, where each factor is expressed as a decimal (e.g., 0.90 for 90%). Availability = (Planned production time - Downtime) / Planned production time. Performance = Actual output / (Ideal cycle time x Planned production time). Quality = Good units / Total units produced.
What is world-class OEE?
According to SEMI E10 and the widely cited lean manufacturing benchmark, world-class OEE is 85.0%: Availability of 90%, Performance of 95%, and Quality of 99.9%. Achieving 85% OEE is considered excellent for discrete manufacturing; many facilities operate at 40-60% OEE.
What is the difference between OEE and TEEP?
OEE measures effectiveness during planned production time. TEEP (Total Effective Equipment Performance) measures effectiveness against all calendar time, including unscheduled and non-working time. TEEP = OEE x (Planned production time / Total calendar time). TEEP is always lower than or equal to OEE.
What are the six big losses in OEE?
The six big losses (per Japan Institute of Plant Maintenance / TPM framework) are: (1) Breakdowns (availability), (2) Setup and adjustment (availability), (3) Minor stoppages (performance), (4) Reduced speed (performance), (5) Startup defects (quality), (6) Production defects (quality). Each maps to one of the three OEE factors.
How do I collect data for OEE calculation?
Track: planned production time per shift (from the production schedule), unplanned downtime (from maintenance logs or operator records), ideal cycle time (from engineering standards), actual parts produced, and parts rejected. Many plants use automated data collection via SCADA, MES, or IoT sensors to capture these values in real time.
Official sources
- SEMI International Standards: SEMI E10 Equipment Reliability, Availability, Maintainability, and Productivity.
- NIST Manufacturing Extension Partnership: NIST MEP Continuous Improvement.
Reviewed by the CalculatorHub team, edited by James Graham, 14 June 2026. See our methodology.