How do you calculate OEE?

OEE = Availability x Performance x Quality. With 480 min planned, 55 min down, a 20-sec ideal cycle, 1,180 total and 1,125 good units, availability is 88.54%, performance is 92.55%, quality is 95.34%, and OEE is 78.12%.

What is a good OEE score?

World-class discrete manufacturing is around 85%, a typical plant runs 60-70%, and below 50% signals major loss. The 78.12% in this example is above average and approaching good, with the largest remaining loss in availability at 88.54%.

What is the difference between OEE and availability?

Availability is only one of the three OEE factors — it measures the share of planned time the machine actually ran (88.54% here, after 55 minutes of downtime). OEE multiplies availability by performance and quality, so it is always lower than any single factor.

Why is my performance over 100% impossible but mine looks high?

Performance compares actual output to the theoretical maximum at ideal cycle time. If it exceeds 100%, your ideal cycle time is set too slow; recalibrate it to the true fastest sustainable cycle. Here 92.55% means the line ran slightly under its ideal speed during run time.

Does OEE include planned downtime like breaks or changeovers?

Standard OEE excludes planned, non-production time from planned production time, then counts everything that stops a scheduled run — including changeovers and minor stops — as downtime. Whether breaks are in or out depends on how you set planned time, so be consistent across shifts.

Which OEE factor should I improve first?

Attack the lowest factor with the biggest loss. In this run availability (88.54%) is the weakest, so the 55 minutes of downtime is the highest-leverage target — reducing it lifts OEE more than chasing the already-strong 95.34% quality.

Production calculator

OEE Calculator

Overall Equipment Effectiveness (OEE) is the single most-used metric for measuring how completely a production line or machine converts scheduled time into good, sellable units. It multiplies three losses — availability (downtime), performance (speed), and quality (defects) — into one percentage, so plant managers and continuous-improvement engineers can compare cells, shifts, and assets on a level field. A line running 88% available, 92% performance, and 95% quality is not running at any of those numbers; it is running at their product, 78% OEE. This calculator takes your shift's planned time, downtime, ideal cycle time, and total and good counts and returns OEE along with each of its three factors so you can see exactly where the time went.

What this calculator does

Calculate availability, performance, quality, and overall equipment effectiveness.
Use when a machine or line needs a reliable effectiveness score.
It computes Overall Equipment Effectiveness as the product of availability, performance, and quality from one period's planned time, downtime, ideal cycle, and unit counts.

Formula used

Availability = run time ÷ planned time
Performance = ideal cycle × total count ÷ run time
Quality = good count ÷ total count
OEE = availability × performance × quality

Inputs explained

Planned production time: undefined
Downtime: undefined
Ideal cycle time: undefined
Total count: undefined
Good count: undefined

How to use the result

Use it at the end of a shift, run, or day to score how much of your scheduled time produced good parts and to isolate which loss bucket is hurting most.
OEE measures effectiveness against your planned production time only; it does not penalize unscheduled time, so a line that is rarely scheduled can show high OEE while contributing little throughput.

Current U.S. benchmarks

The U.S. has 21,668 machinery manufacturing establishments employing about 1,086,146 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate OEE? OEE = Availability x Performance x Quality. With 480 min planned, 55 min down, a 20-sec ideal cycle, 1,180 total and 1,125 good units, availability is 88.54%, performance is 92.55%, quality is 95.34%, and OEE is 78.12%.
What is a good OEE score? World-class discrete manufacturing is around 85%, a typical plant runs 60-70%, and below 50% signals major loss. The 78.12% in this example is above average and approaching good, with the largest remaining loss in availability at 88.54%.
What is the difference between OEE and availability? Availability is only one of the three OEE factors — it measures the share of planned time the machine actually ran (88.54% here, after 55 minutes of downtime). OEE multiplies availability by performance and quality, so it is always lower than any single factor.
Why is my performance over 100% impossible but mine looks high? Performance compares actual output to the theoretical maximum at ideal cycle time. If it exceeds 100%, your ideal cycle time is set too slow; recalibrate it to the true fastest sustainable cycle. Here 92.55% means the line ran slightly under its ideal speed during run time.
Does OEE include planned downtime like breaks or changeovers? Standard OEE excludes planned, non-production time from planned production time, then counts everything that stops a scheduled run — including changeovers and minor stops — as downtime. Whether breaks are in or out depends on how you set planned time, so be consistent across shifts.

Last reviewed 2026-05-12.