OEE Calculator - Overall Equipment Effectiveness
Free professional calculator to measure Overall Equipment Effectiveness with comprehensive manufacturing performance analysis and industry benchmarks
Overall Equipment Effectiveness Calculator
Calculate OEE using availability, performance, and quality metrics to measure manufacturing efficiency.
Input Parameters
Availability
Performance
Quality
Results
Overall OEE
OEE Benchmark
Complete Guide to OEE (Overall Equipment Effectiveness)
What is OEE?
Overall Equipment Effectiveness (OEE) is a manufacturing performance metric that identifies the percentage of manufacturing time that is truly productive. It measures the efficiency of a single machine or process.
OEE combines three key performance factors:
- Availability: Equipment uptime performance
- Performance: Speed and cycle time efficiency
- Quality: Good parts vs. total parts produced
- Six Big Losses: Identifies major productivity killers
- Continuous Improvement: Baseline for optimization
OEE Formula
Main Formula:
OEE = Availability × Performance × QualityComponent Formulas:
World-class OEE is 85% or higher, representing manufacturing excellence.
OEE Calculation Example
Manufacturing Line Example:
A production line operates for one 8-hour shift with the following data:
Availability Data:
- • Planned Production: 480 minutes
- • Planned downtime: 40 minutes
- • Unplanned downtime: 47 minutes
- • Operating time: 393 minutes
Availability = 393 ÷ 480 = 81.9%
Performance Data:
- • Ideal cycle time: 1.0 minute
- • Total count: 19,271 pieces
- • Ideal run rate: 19,271 minutes
- • Operating time: 393 minutes
Performance = 19,271 ÷ 393 = 49.0%
Quality Data:
- • Total count: 19,271 pieces
- • Reject count: 423 pieces
- • Good count: 18,848 pieces
- • Quality rate calculated
Quality = 18,848 ÷ 19,271 = 97.8%
Overall OEE = 81.9% × 49.0% × 97.8% = 39.2%
This indicates significant opportunities for improvement in performance efficiency.
The Six Big Losses in Manufacturing
Availability Losses
1. Equipment Failures
Unplanned stops due to equipment breakdowns
2. Setup & Adjustments
Planned stops for changeovers and setups
Performance Losses
3. Idling & Minor Stops
Short stops under 5 minutes
4. Reduced Speed
Running below ideal cycle time
Quality Losses
5. Process Defects
Defective parts during stable production
6. Startup Rejects
Defective parts during startup/warmup
OEE Industry Benchmarks & Standards
OEE Performance Levels:
Exceptional performance with minimal losses
Above average with room for improvement
Average performance with significant opportunities
Requires immediate attention and improvement
Industry Typical OEE:
How to Improve OEE Performance
Improve Availability:
- • Implement preventive maintenance programs
- • Reduce changeover times (SMED)
- • Improve equipment reliability
- • Better maintenance planning
- • Operator training programs
- • Standardize procedures
- • Use predictive maintenance
Improve Performance:
- • Eliminate minor stops and micro-stops
- • Optimize machine settings
- • Improve material flow
- • Reduce cycle time variations
- • Implement error-proofing
- • Better operator training
- • Standardize work methods
Improve Quality:
- • Implement statistical process control
- • Improve first-pass yield
- • Reduce startup/warmup time
- • Better process control
- • Implement mistake-proofing
- • Improve raw material quality
- • Regular calibration schedules
Frequently Asked Questions
What’s the difference between OEE and TEEP?
OEE measures effectiveness during planned production time, while TEEP (Total Effective Equipment Performance) includes all calendar time. TEEP = OEE × Utilization, where Utilization = Planned Production Time ÷ Calendar Time.
How often should I calculate OEE?
Calculate OEE in real-time if possible, but at minimum daily or per shift. This allows for quick identification of issues and trends. Weekly and monthly averages provide good benchmarking data.
What data do I need to calculate OEE?
You need: Planned production time, actual operating time, ideal cycle time, total pieces produced, and good pieces produced. This data is typically collected from production systems, operators, or manufacturing execution systems (MES).
Can OEE be over 100%?
Theoretically yes, if equipment runs faster than the ideal cycle time. However, this usually indicates the ideal cycle time needs adjustment. Sustainable OEE should be based on realistic, achievable ideal cycle times.
How does OEE relate to other manufacturing metrics?
OEE complements metrics like Overall Labor Effectiveness (OLE), First Pass Yield (FPY), and Total Productive Maintenance (TPM). Together, they provide a comprehensive view of manufacturing performance and identify improvement opportunities.