OEE Calculator
Calculate Overall Equipment Effectiveness in seconds — availability, performance and quality combined into one score. Free, instant and fully in your browser.
OEE
77.1%
OEE = Availability × Performance × Quality
World-class OEE is around 85%; most plants run at 55–65%. Use OEE to find which loss — availability, performance or quality — to attack first.
OEE shows the gap — Yamazo closes it
You calculated this from estimates. Measure the real one from shop-floor video.
A worked example
One shift of 480 planned minutes, 47 minutes lost to stoppages, 14,280 units produced at an ideal cycle time of 1.7 seconds, of which 14,050 passed first time.
OEE = Availability × Performance × Quality
- Run time
- 480 − 47 = 433 min
- Availability
- 433 ÷ 480 = 90.2%
- Ideal output time
- 14,280 × 1.7 s = 24,276 s
- Performance
- 24,276 ÷ 25,980 = 93.4%
- Quality
- 14,050 ÷ 14,280 = 98.4%
- OEE
- 0.902 × 0.934 × 0.984 = 82.9%
The three factors are all high, yet nearly a fifth of the planned time is gone. Availability is the weakest of the three here, so the 47 minutes of stoppages is where the next hour of improvement work belongs.
What is OEE?
Overall Equipment Effectiveness (OEE) measures how much of your planned production time is truly productive. It multiplies three factors: Availability (uptime vs planned time), Performance (actual vs ideal speed) and Quality (good units vs total). An OEE of 100% means only good parts, as fast as possible, with no stops. It is the single number that exposes hidden capacity.
How to calculate OEE
- 1
Availability
Subtract downtime from planned production time to get run time, then divide run time by planned time.
- 2
Performance
Multiply ideal cycle time by units produced, then divide by run time. This shows speed losses and micro-stops.
- 3
Quality
Divide good units by total units. Multiply Availability × Performance × Quality for your OEE.
Frequently asked questions
What is a good OEE score?
World-class OEE is generally about 85% (roughly 90% availability × 95% performance × 99.9% quality). Most manufacturers operate between 55% and 65%, so there is usually significant room to improve.
Why is my measured OEE higher than reality?
Manual OEE tends to run high because micro-stops, short slowdowns and optimistic ideal cycle times are easy to miss. Objective, video-based measurement (as in Yamazo Studio) closes that gap.
Does Yamazo Studio calculate OEE automatically?
Yamazo Studio is a video time-study and work-analysis tool, not a real-time OEE monitor. It feeds OEE improvement by exposing the root causes of availability, performance and quality losses through frame-accurate analysis.