Overall Equipment Effectiveness (OEE) Calculator

Quantify machine Availability, Performance, and Quality. Expose the Six Big Losses and calculate lost production hours on your shop floor.

Shop Floor Efficiency Analyser

Overall Equipment Effectiveness (OEE) Calculator

Calculate your machine Availability, Performance, and Quality scores. Uncover the Six Big Losses and quantify hidden capacity trapped on your shop floor.

Pillar 1: Availability (Operating vs Planned Time)92.0% Avail.
8 hours
4h8h (Standard)10h12h
Scheduled lunch, shift change, scheduled maintenance
45 mins
Breakdowns, tool changes, waiting for raw stock or programmes
35 mins lost
0 mins (No stops)30 mins60 mins (1 hour)240 mins (Severe)
Pillar 2: Performance (Speed & Micro-Stops)93.8% Perf.
Fastest theoretical process time under optimal conditions
sec
Total part count processed through the machine during the shift
units
Pillar 3: Quality (Good vs Defective Units)97.0% Qual.
Parts failing dimensional inspection or startup scrap
scrap
0 defects (100% First Pass)Good Parts: 291 unitsScrap: 9 units
Overall Equipment EffectivenessTypical Manufacturing
Calculated Overall OEE
83.6%OEE Score

Typical industry range. Strong foundation with clear capacity gains available by smoothing bottlenecks.

Availability
92.0%
A = OT / PPT
Performance
93.8%
P = Net / OT
Quality
97.0%
Q = Good / Total
Lost Capacity per Shift-1.2 hrs lost
Unplanned Downtime Loss0.58h (35m)
Speed Loss & Micro-Stops0.42h
Scrap & Defect Waste0.19h (9 parts)
Pink: DowntimeYellow: SpeedPurple: ScrapGreen: Value
Recover lost production hours with live scheduling

Synctile helps machine shops eliminate idle waiting time, prevent queue bottlenecks, and lift shop floor availability by up to 25%.

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Instant setup. No complicated ERP installation required.

World-Class OEE Benchmarks (Industry Standard Guide)
World-Class (> 85%)

Benchmark for top-tier automotive and precision manufacturing: ~90% Availability, ~95% Performance, ~99.9% Quality.

Typical (70% to 85%)

Standard operational performance for high-mix CNC and job shops. Significant hidden capacity available to unlock.

Bottleneck Alert (< 70%)

Heavy losses due to unplanned equipment breakdowns, slow cycle times, or high scrap. Requires immediate line leveling.
Total Productive Maintenance (TPM)

What is Overall Equipment Effectiveness (OEE)?

Overall Equipment Effectiveness (OEE) is the gold standard metric for measuring manufacturing productivity. Developed as part of Total Productive Maintenance (TPM), OEE measures the percentage of planned production time that is truly productive.

An OEE score of 100% represents perfect manufacturing: producing only good parts (100% Quality), at full nameplate speed (100% Performance), without any unplanned equipment stops (100% Availability). By breaking performance down into three clear pillars, OEE reveals exactly where hidden capacity is being lost.

The Three Pillars of OEE Explained

A

1. Availability

Measures percentage of planned time the machine was actually running versus stopped.

Availability = Operating Time ÷ Planned Production Time
P

2. Performance

Measures speed losses, micro-stoppages, and machine running below rated speed.

Performance = (Total Count × Ideal Cycle) ÷ Operating Time
Q

3. Quality

Measures first-pass yield and percentage of manufactured parts that pass inspection.

Quality = Good Count ÷ Total Count

The Six Big Losses in Manufacturing

Every lost minute on your shop floor can be traced directly to one of the Six Big Losses:

Availability Loss 1. Equipment Breakdowns

Unplanned mechanical or electrical failures, spindle crashes, hydraulic leaks, and sensor faults.

Target: Autonomous PM
Availability Loss 2. Setup and Changeover Adjustments

Tooling changes, fixture alignments, CNC programme loading, and waiting for material staging.

Target: SMED / Visual Setup
Performance Loss 3. Idling and Minor Stoppages

Brief stops under 2 to 5 minutes: part jams, sensor cleaning, material feed misalignments.

Target: Poka-Yoke / Guide Rails
Performance Loss 4. Reduced Cycle Speed

Operating equipment below designed nameplate speed due to worn cutting tools or operator hesitation.

Target: Standardized Work
Quality Loss 5. Startup Rejects & Warmup Scrap

Defective test pieces produced during machine warm-up, tool setting, and initial calibration.

Target: Pre-flight Checklists
Quality Loss 6. Production Rejects and In-Process Scrap

Parts that fail dimensional inspection or quality audits during steady-state production.

Target: First-Piece In-Process SPC

Concrete Numerical Example of OEE Calculation

Consider a precision CNC milling machine running an 8-hour shift (480 minutes):

  • Planned Non-Working Time: 45 minutes of scheduled breaks → Planned Production Time = 435 minutes.
  • Unplanned Downtime: 35 minutes of tool breakage → Operating Time = 400 minutes (24,000 seconds).
  • Availability: 400 ÷ 435 = 91.95%.
  • Production Output: 300 total brackets produced with an ideal design cycle time of 75 seconds.
  • Performance: (300 × 75s) ÷ 24,000s = 22,500 ÷ 24,000 = 93.75%.
  • Quality: 9 defective brackets scrapped → 291 good parts ÷ 300 total = 97.00%.
  • Overall OEE: 0.9195 × 0.9375 × 0.9700 = 83.62% (Typical to Good Tier).
Synctile Shop Floor Control

Lift machine availability by eliminating shop floor coordination drag.

A significant portion of machine downtime is caused by operators waiting for travellers, searching for fixtures, or clarifying priorities. Synctile provides live visual job queues directly at machine cells.

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Frequently Asked Questions About OEE & Machine Performance

What is Overall Equipment Effectiveness (OEE)?

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Overall Equipment Effectiveness (OEE) is the standard manufacturing benchmark for measuring how effectively manufacturing equipment is utilised. An OEE score of 100% means you are manufacturing only good parts (100% Quality), as fast as possible (100% Performance), with zero unplanned downtime (100% Availability).

What is the formula for calculating OEE?

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OEE is calculated by multiplying three factors: Availability multiplied by Performance multiplied by Quality. Specifically: Availability = Operating Time / Planned Production Time; Performance = (Total Count * Ideal Cycle Time) / Operating Time; Quality = Good Units / Total Count.

What are the Six Big Losses in OEE?

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The Six Big Losses are: 1. Equipment Unplanned Breakdowns (Availability), 2. Setup and Tooling Adjustments (Availability), 3. Small Stops and Idling (Performance), 4. Reduced Machine Speed (Performance), 5. Startup Scrap and Rejects (Quality), and 6. Production Defects (Quality).

What is considered a good OEE score in manufacturing?

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85% or higher is considered World-Class (typical for discrete high-volume manufacturing). 70% to 85% is typical and considered good for high-mix CNC job shops and fabrication. An OEE below 70% indicates significant bottleneck risks, excessive unplanned downtime, or speed losses that require active shop floor intervention.

How does visual scheduling improve OEE?

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Visual scheduling software like Synctile eliminates operator waiting time for drawings, raw material, or job sequences. By maintaining clear job queues at every work centre, machine setup transitions are streamlined, directly lifting Availability and Performance.