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OEE calculator

Turn production data into Availability, Performance, Quality and OEE—and see where planned production time was lost.

OEE from production data

Time scheduled for production in the selected unit.

Time within the planned period when production was stopped.

Fastest sustainable cycle for one unit, using the selected time unit.

All units produced, including rejected units.

Units accepted as good output.

Overall equipment effectiveness
68.5%
Availability
87.5%
Performance
88.0%
Quality
88.96%
Run time
420 min
Fully productive time
328.8 min

Where planned production time went

  • Stop loss
    60 min
  • Speed loss
    50.4 min
  • Quality loss
    40.8 min

Stop time is the largest loss.

These factors describe the entered production data. They do not identify root causes or establish a universal benchmark.

Included

  • Availability, Performance, Quality and OEE from production observations
  • Stop-time, speed and quality losses reconciled to planned production time
  • Run time, theoretical production time and fully productive time
  • Seconds, minutes or hours without changing the physical scenario

Not included

  • Planned shutdowns outside the entered planned production time
  • Root-cause diagnosis, maintenance recommendations or capacity certification
  • A universal good or bad OEE benchmark
  • Live machine, MES or production-system data

What this means

Overall Equipment Effectiveness combines three separate questions. Availability asks how much planned production time the equipment ran. Performance compares actual output with the output implied by the ideal cycle time. Quality asks what share of the total count was good.

Multiplying those factors gives OEE. The same result can also be read as fully productive time divided by planned production time. The loss view keeps stop, speed and quality losses separate so a low score is not mistaken for one single problem.

The ideal cycle time must describe the same product and operating basis as the counts. If the inputs imply Performance above 100%, this calculator stops and asks you to verify them rather than hiding the inconsistency.

Formula & worked example

run time = planned production time − stop time
availability = run time ÷ planned production time
performance = ideal cycle time × total count ÷ run time
quality = good count ÷ total count
OEE = availability × performance × quality

fully productive time = ideal cycle time × good count

480 planned minutes, 60 stop minutes, 0.8 minute ideal cycle, 462 total and 411 good units

Availability: (480 − 60) ÷ 480
87.5%
Performance: 0.8 × 462 ÷ 420
88.0%
Quality: 411 ÷ 462
89.0%

OEE is 68.5%, equivalent to 328.8 fully productive minutes out of 480 planned minutes.

How this calculation works

The calculation follows the formulas, definitions and assumptions explained on this page. The references below support the method and any stated boundaries.

Official sources

Common questions

What belongs in planned production time?
Use the time the equipment was scheduled to produce. Exclude breaks or planned shutdowns only if your operating definition excludes them consistently.
Why can Performance be invalid above 100%?
In this model, an ideal cycle time should be the fastest sustainable cycle for the same product and operating basis. A result above 100% usually means the ideal cycle, counts, units or run time do not describe the same scenario.
Is a higher OEE always better?
OEE is useful for comparing a consistently defined process with itself over time. It is not a universal verdict: product mix, constraints, planned time definitions and business goals differ.
Does the largest loss identify the root cause?
No. It identifies which mathematical loss factor is largest in these inputs. Finding a physical root cause requires process and equipment investigation.

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