OEE and downtime cost calculator
Enter one shift on one line. You get availability, performance, quality, OEE and your biggest loss, instantly and free. Add your work email to see what downtime, slow running and scrap cost you every month, and we email you the summary.
Your OEE
69.8%
- Availability
- 87.5%
- Performance
- 83.3%
- Quality
- 95.7%
Your OEE is calculated in your browser. Your inputs are sent only when you ask for the cost breakdown, so we can email you the summary. The result is an estimate from your inputs, not a promise of savings.
How the numbers are worked out
- Availability = (planned time minus downtime) ÷ planned time.
- Performance = ideal cycle time × parts made ÷ run time (capped at 100%).
- Quality = good parts ÷ parts made.
- OEE = availability × performance × quality.
- OEE also equals good parts × ideal cycle time ÷ planned time. So if you change downtime but keep parts made the same, the loss moves between availability and performance and OEE does not change. Change parts made to see OEE move.
- Lost margin = good parts not made (from downtime, slow running and scrap) × contribution margin per part × shifts per month.
This is an estimate from the numbers you type. Real OEE projects usually find more downtime than manual logs show, because short stops are rarely written down. That is why measuring automatically on one machine first is the cheapest way to know the real figure.
Questions
How is OEE calculated?
OEE is availability multiplied by performance multiplied by quality. Availability is run time divided by planned production time. Performance is ideal cycle time multiplied by total parts, divided by run time. Quality is good parts divided by total parts.
How is the cost of downtime calculated here?
Downtime minutes are converted into the good parts the line would have made at the ideal cycle time and current quality rate, then multiplied by your contribution margin per part. Slow running and scrap are costed the same way.
What is a good OEE?
It depends on the process and how planned time is defined. 85 percent is often quoted as world class for discrete manufacturing, but the more useful target is steady improvement on your own bottleneck with a consistent definition.
Why do you ask for my email?
The OEE result is free without it. The cost breakdown and the emailed summary need your email, so we can send it and an engineer can follow up if you want. Your inputs and results are stored with your email for that purpose only, under our Privacy Policy. No newsletter.