OEE Calculator
🏭 Industrial · Overall Equipment Effectiveness: Availability × Performance × Quality
OEE (Overall Equipment Effectiveness) is the central metric of lean manufacturing and Total Productive Maintenance (TPM) philosophy. Systematized by Seiichi Nakajima in 1988, this metric summarizes in a single number how much of a production line’s theoretical maximum capacity actually converts into valuable production.
The three components reflect the three fundamental types of loss in production:
- Availability: loss from unplanned stops (breakdowns, waiting for material, setup).
- Performance: loss from slow running and minor stops (running below the ideal cycle time).
- Quality: loss from defective/scrap production.
World-class reference: the world-class target proposed in Nakajima’s original work is 85% OEE (typically obtained from the product of 90% availability × 95% performance × 99% quality). In typical (unoptimized) manufacturing plants, OEE is usually around 60% — the gap is largely due to unplanned stops.
This tool's calculation logic has been checked against a hand-computed numerical verification test. Test source: src/lib/calc/oee.test.ts.
- [11] Nakajima, Seiichi. Introduction to {TPM}: Total Productive Maintenance. Productivity Press, 1988. ↗
OEE Calculator — EngineersLab calc card
Formula: OEE = Availability × Performance × Quality
Sources: [11] Introduction to {TPM}: Total Productive Maintenance
Tool version: 1.0.0 · Date:
Source URL: https://engineerslab.com.tr/en/araclar/oee
Results are for educational and preliminary-sizing purposes; final engineering design decisions must reference the relevant standards and a licensed engineer's approval.