OEE Calculator
Optimize manufacturing efficiency with our free OEE Calculator. Instantly measure Availability, Performance, and Quality to determine your equipment's true productivity and identify areas for operational improvemen
Updated December 2025
OEE Score
Global Metric
Availability
Run Time
Performance
Speed
Quality
Good Units
The Waterfall of Waste
Availability Loss
45 minSpeed Loss
55 minQuality Loss
9 min PRIORITY ACTION
Optimize Speed
Your Performance score of 85.3% is the primary bottleneck. Focusing here yields the fastest ROI.
- Review Cycle Times standards.
- Identify micro-stops.
- Train operators on standard work.
Improvement Potential
Potential Efficiency Gain
+25.8%
Theoretical gain by eliminating all waste (Six Big Losses).
OEE Analysis & Improvement Guide
A comprehensive interactive suite for manufacturing leaders. Interpret OEE results, visualize losses, and identify the Six Big Losses.
The Six Big Losses Visualizer
Total time is money. See how Downtime (Red), Slow Speed (Purple), and Defects (Amber) eat into your Fully Productive Time (Green).
Ideal Shift: No losses. Your machine ran perfectly all day (100% OEE).
Interpreting Your Score
OEE isn't just a number; it's a benchmark of competitiveness. Where does your facility stand against world-class standards?
< 65% OEE
Unacceptable
Significant economic loss. The process needs urgent attention. High downtime or scrap rates are eating profit.
Action: Formation of Task Force 65-75% OEE
Regular / Average
Typical for un-optimized factories. You are making product, but leaving a lot of capacity on the table.
Action: Root Cause Analysis 75-85% OEE
Acceptable
Good performance. You have stable processes and controlled losses. Improvement requires fine-tuning.
Action: Continuous Improvement 85%+ OEE
World Class
Lean Six Sigma level excellence. Highly competitive with minimal waste. Very difficult to sustain.
Action: Sustain & Innovate OEE Meter Hover over the list to test levels
The Three Factors
OEE is calculated by multiplying three distinct metrics. One bad score pulls the entire average down drastically.
Availability
Is the machine running or stopped?
Big Losses:
Equipment Breakdowns
Setup & Adjustments
Performance
Is it running at full speed?
Big Losses:
Idling & Minor Stops
Reduced Speed
Quality
Are the parts good?
Big Losses:
Startup Rejects
Production Defects
The "Multiplication Effect"
Even if you score 90% in all three categories (which sounds good), your OEE is only 72.9% (0.9 × 0.9 × 0.9). OEE punishes inconsistency.
The Formulas
The Factor
Availability Formula
A=
Run Time Planned Production Time
Planned Production Time is your Shift Length minus planned Breaks. It does not include off-shift time.
The Factor
Performance Formula
P=
(Ideal Cycle Time × Total Parts) Run Time
Also known as "Speed Efficiency". If the result is > 100%, your Ideal Cycle Time is set incorrectly.
Troubleshooting Guide
Use your OEE breakdown to find the root cause. Don't try to fix everything at once; attack the lowest percentage first.
Problem A
Low Availability
The machine stops too often.
SMED (Setup Reduction)
Are changeovers taking hours? Use SMED to convert internal setup steps to external steps.
Preventive Maintenance
Are breakdowns unplanned? Implement a TPM schedule to fix parts before they break.
Problem B
Low Performance
The machine is running slow.
The "Micro-Stop" Audit
Often, 50% of lost time is small jams (< 2 mins) that operators don't record. Film the line to catch them.
Material Consistency
Are operators slowing the machine down to handle bad raw materials? Fix the input quality.
Expert Knowledge
Common OEE Questions
Can OEE be over 100%?
Technically, no. OEE represents efficiency relative to the theoretical maximum. If you score >100%, it almost always means your Ideal Cycle Time is set too slow (sandbagging). Re-evaluate the theoretical maximum speed of the equipment.
What is the difference between OEE and TEEP?
OEE only looks at "Planned Production Time" (it ignores scheduled breaks and lack of orders).
TEEP (Total Effective Equipment Performance) looks at 24/7/365 time. TEEP reveals the "hidden factory" capacity if you ran shifts around the clock.
TEEP (Total Effective Equipment Performance) looks at 24/7/365 time. TEEP reveals the "hidden factory" capacity if you ran shifts around the clock.
How do I track Micro-stops?
Micro-stops (idling for < 2 minutes) are the hardest to track manually because operators are too busy clearing the jam to write it down. The best way is to use automated counters or sensors on the machine PLC to log every stop event automatically.
Verified Expert
Disclaimer: This tool is for informational and educational purposes only. Calculations are based on standard formulas but may not account for unique business variables. We do not accept liability for decisions made based on these results.