OEE calculator
Enter shift time, stops, ideal cycle time and production counts. See your line's OEE, where the time went and the biggest loss, in minutes.
The calculation runs in your browser; the values you enter are not sent anywhere.
- OEE
- 80%
- Availability
- 89.6%
- Performance
- 91%
- Quality
- 98.2%
Loss waterfall
From planned production time to productive time: downtime, speed and quality losses (minutes)
Planned production time450 min100% of planned time
Downtime loss▲ Biggest loss47 min10.4% of planned time
Speed loss36.3 min8.1% of planned time
Quality loss6.7 min1.5% of planned time
Productive time360 min80% of planned time
Comparison with the common benchmark
| Factor | Yours | Benchmark |
|---|---|---|
| Availability | 89.6% | 90% |
| Performance | 91% | 95% |
| Quality | 98.2% | 99.9% |
| OEE | 80% | 85% |
85% OEE is often called "world class" (attributed to Nakajima; availability 90%, performance 95%, quality 99.9%). It is a widely used benchmark, not a firm standard; the real target is your own line's history.
OEE = availability × performance × quality · performance = ideal cycle × total pieces / run time
OEE depends on how the inputs are defined: the split between planned and unplanned stops and the ideal cycle time vary between companies. This tool gives a first estimate; use the same definition when comparing lines.
Let's look at which of your OEE losses could be spotted early from machine data.
Request a conversation01
How to use it
A
Enter the shift time and the planned and unplanned stops in minutes.
B
Add the ideal cycle time (or ideal rate), the total production and the defective or good count.
C
Read the OEE, the loss waterfall and the biggest loss; enter a calendar time to see TEEP as well.
02
How is OEE calculated?
OEE is the product of three ratios. Availability shows how much of the planned production time the machine actually ran. Performance shows how close it got to the ideal speed while running. Quality shows how much of the output was right the first time.
Planned stops (breaks, planned maintenance) are left out of the base, so they are not an OEE loss. Unplanned stops are availability loss. Because this split varies between companies, use the same definition whenever you compare results.
The loss waterfall turns the same calculation into minutes: planned time shrinks through downtime, speed and quality losses, leaving productive time, the time spent making only good parts at ideal speed. The longest bar tells you where to start improving.
03
The six big losses
Total Productive Maintenance (TPM) groups OEE losses into six. Those that reduce availability: (1) equipment failures and (2) setup, adjustment and changeover time. Those that reduce performance: (3) minor stops and idling and (4) reduced speed. Those that reduce quality: (5) process defects and scrap and (6) start-up yield loss.
Sorting losses into these groups points the countermeasure at the right place. Condition monitoring and predictive maintenance suit breakdown losses; quick-changeover work suits setup losses; detailed stop-reason logging suits minor stops; process control suits quality losses.
04
Is 85% really the target?
The widely cited "world class" 85% is an example product attributed to Nakajima, assuming availability of 90%, performance of 95% and quality of 99.9%. It is not a firm standard and may not fit your sector, product mix or OEE definition. For a line with frequent product changes, 65% can be a good result.
The most honest comparison is the same line's own history. OEE tracked over months with one definition shows whether an improvement worked. TEEP, calculated on calendar time, also exposes capacity the line never uses.
FAQ
- What is OEE and how is it calculated?
- Overall Equipment Effectiveness is the product of availability, performance and quality. Availability = run time / planned production time, performance = ideal cycle × total pieces / run time, quality = good pieces / total pieces.
- What does performance above 100% mean?
- Usually the ideal cycle time was entered longer than it really is, or the time and count data are inconsistent. A machine cannot run faster than its ideal speed; fix the inputs before trusting the result.
- Do planned stops lower OEE?
- Not in this tool: planned stops (breaks, planned maintenance) are removed from the planned production time. If you want to count them as loss, enter zero planned stops or look at TEEP on calendar time.
- What is the difference between OEE and TEEP?
- OEE is based on planned production time. TEEP is based on calendar time: OEE × (planned production time / calendar time). It also shows time outside the shifts as loss.
- What should I enter as the ideal cycle time?
- The machine's design speed or best sustainable speed, not the average actual speed. If you enter the actual average, speed loss disappears and OEE comes out higher than it is.
Explain OEE losses with data
Let's look at the trace that stops and speed losses leave in your machine data and see which loss early warning could prevent.