OEE Calculator: Calculate Overall Equipment Effectiveness
The Overall Equipment Effectiveness (OEE) is the core metric for measuring value creation in manufacturing. It combines losses from Availability, Performance, and Quality into a single, easily comparable value. Use this free OEE calculator to quickly and accurately determine where you stand globally.
What is the OEE Goal?
An OEE value of 85% is considered World-Class for discrete manufacturing processes. The target values for the three factors are: Availability (A) 90%, Performance (P) 95%, and Quality (Q) 99.9%.
Start Calculation – Enter Data
⏰ Step 1: Time Data (Availability)
💡 Standard OEE Definition
Availability (A): Operating Time / Planned Production Time
Performance (P): (Actual Parts × Ideal Cycle Time) / Operating Time
Quality (Q): Good Parts / Actual Parts
Performance (P): (Actual Parts × Ideal Cycle Time) / Operating Time
Quality (Q): Good Parts / Actual Parts
Complete shift duration (e.g., 480 Min = 8h)
Breaks, shift changeovers, planned maintenance
✓ Automatically calculated
Machine failure, setup, material shortages, etc.
✓ Automatically calculated
⚡ Step 2: Production & Quality Data (Performance & Quality)
Theoretically fastest time per piece
Total parts produced (good + scrap + rework)
Finally defective/rejected parts
Parts that required rework
✓ Automatically calculated
✓ Based on operating time
📊 Step 3: OEE Calculation & Analysis
Enter your production data to start the OEE calculation
Interpretation of OEE Metrics and Loss Analysis
1. Availability (A) – The Downtime Losses ⏱️
This factor measures how much of your planned production time was actually used for production. A low value indicates high availability losses. The main causes are unplanned downtime (machine failures, unplanned maintenance) and excessive setup times. Action items: Optimize maintenance strategy (Predictive Maintenance), use SMED for setup time reduction.
2. Performance (P) – The Speed Losses ⚡
Performance shows how fast the equipment actually runs compared to its ideal cycle time. Losses here arise from micro-stops (brief interruptions) or reduced speed (slow cycling). Action items: Eliminate sources of malfunction, optimize processes, train operators to adhere to the ideal cycle time.
3. Quality (Q) – The Defect Losses ✅
The Quality factor assesses the proportion of defect-free parts in total production. It includes all losses due to scrap and rework. Action items: Root-cause analysis for defects, introduction of Poka-Yoke systems, improving the First-Pass-Yield rate.
Start working with SYMESTIC today to boost your productivity, efficiency, and quality!
