#1 Manufacturing Blog - SYMESTIC

Free OEE calculator โ€“ fast and accurate

Written by Symestic | Jun 6, 2025 7:54:06 PM

What is OEE and why is calculation important?

The Overall Equipment Effectiveness (OEE) is the most important metric for measuring total equipment effectiveness in production. It combines the three critical factors Availability, Performance, and Quality into a single, meaningful percentage.

With our OEE calculator, you can quickly and precisely assess your equipment efficiency, identify improvement opportunities, and calculate the ROI of optimization measures.

85%
World-class OEE target
65-75%
Average
< 50%
Critical

โšก OEE Calculator Quick Facts

โœ“
Hard & soft basis calculation
๐Ÿ’ฐ
ROI analysis & savings potential
๐Ÿ“Š
Benchmark classification
๐Ÿš€
Improvement recommendations
 

๐Ÿญ OEE Calculator Professional

Calculate your Overall Equipment Effectiveness with hard & soft basis + ROI analysis

โฐ Step 1: Capture Time Data

 

Production Times According to SYMESTIC Standard

๐Ÿ’ก Critical Success Factors
Hard Basis: All downtime (planned + unplanned) reduces OEE
Soft Basis: Only unplanned downtime reduces OEE
Complete shift time (e.g., 360 Min = 6h)
Breaks, shift changes, planned maintenance
โœ“ Automatically calculated
Machine failure, changeovers, breakdowns
Material shortage, staff unavailable, etc.
โœ“ Automatically calculated

โšก Step 2: Production & Quality Data

Theoretically fastest time per piece
โœ“ Automatically calculated
Total produced parts
Faulty/defective parts
Parts that required rework
โœ“ Automatically calculated

๐Ÿ’ฐ Step 3: ROI & Loss Analysis (Optional)

For ROI calculation
Working days excluding weekends
3-shift operation = 24h

๐Ÿ“Š Step 4: OEE Calculation & Analysis

Enter your production data to start the OEE calculation

๐Ÿ“ OEE Formula: How to Calculate Overall Equipment Effectiveness

OEE = Availability ร— Performance ร— Quality
A = 90%
ร—
P = 85%
ร—
Q = 95%
=
72.7%

๐Ÿ•’ Calculate Availability

Availability = (Available Time รท Planned Production Time) ร— 100

Measures the portion of time when the equipment is actually producing (without unplanned downtime).

โšก Calculate Performance

Performance = (Produced Parts รท Theoretically Possible Parts) ร— 100

Compares actual with maximum possible production speed.

โœ… Calculate Quality

Quality = (Good Parts รท Produced Parts) ร— 100

Proportion of error-free produced parts (First-Pass-Yield without rework).

โ“ Frequently Asked Questions about OEE Calculation

What is the difference between hard and soft basis?

Hard Basis: All downtime (planned + unplanned) reduces OEE - stricter evaluation.
Soft Basis: Only unplanned downtime reduces OEE - planned downtime is considered unavoidable.

What is a good OEE value?

โ‰ฅ 85%: World-class performance
75-85%: Very good performance
65-75%: Average range
< 65%: Needs improvement

How often should OEE be calculated?

For continuous improvement, daily or shift-based calculation is recommended. Modern MES systems like SYMESTIC calculate OEE automatically in real-time.

๐Ÿš€ Optimize Your OEE with SYMESTIC CLOUD MES

Automate your OEE calculation with the leading cloud-native MES solution. Real-time dashboards, automatic data collection, and AI-based optimization recommendations.