Manufacturing & quality

Overall Equipment Effectiveness Calculator

Derive availability, performance, quality and OEE from one consistent production period. Enter minutes for the period and seconds for the ideal cycle.

19 / CALCULATE OEE FACTORS

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INPUT GROUP 01

Production time

Planned production timeExclude time when production was not intended.Stops within planned timeMust not exceed planned production time.Ideal cycle time per unitBest achievable cycle for this process; positive seconds.

INPUT GROUP 02

Observed production

Total units producedWhole units produced in the same period.First-pass good unitsExclude units needing rework; cannot exceed total count.

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Read the method and example

YOUR CALCULATION

OEE relates first-pass good production at the ideal cycle to planned production time.

Run time (minutes)

420

Availability

87.50%

Performance

83.33%

Quality

95.00%

Overall equipment effectiveness

69.27%

Production time reconciliation

Production time reconciliation
Time basis	Minutes
Planned production	480
Stops inside the planned period	60
Run time	420
Ideal time for all produced units	350
Ideal time for first-pass good units	332.5

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How the overall equipment effectiveness calculator works

Use one defined process and observation period. Planned production time excludes intervals when there was no intention to produce; stop time is measured inside that planned period. Run time = planned minutes − stop minutes. Stop time cannot exceed planned time. Total and first-pass good production are whole counts, and good count cannot exceed total count.

Availability = run time ÷ planned time. Performance = ideal cycle seconds × total count ÷ 60 ÷ run minutes. Quality = first-pass good count ÷ total count. OEE = availability × performance × quality, equivalently ideal cycle seconds × good count ÷ 60 ÷ planned minutes. The displayed factors are percentages.

The ideal cycle is the process’s best achievable per-unit cycle, not its observed average. Seconds and minutes are converted before division. If ideal time for all units exceeds actual run time, the model rejects the entries rather than clamping performance to 100%. Positive production counts also require positive run time.

With zero planned time and zero production, all percentage factors are undefined and shown as dashes. With planned time but no production, OEE is zero; quality is undefined, and performance is zero only when run time is positive. A fully stopped period has undefined performance. No universal good/bad benchmark or comparison between unlike processes is implied.

Worked example

For 480 planned minutes, 60 stop minutes, a 30-second ideal cycle, 700 total units and 665 first-pass good units, run time is 420 minutes. Availability is 87.5%; performance is 350 ÷ 420 = 83.333333%; quality is 665 ÷ 700 = 95%. Fully productive good-unit time is 332.5 minutes, so OEE is 332.5 ÷ 480 = 69.270833%. Percentages are rounded only for display.

Sources and assumptions

The source material explains the underlying calculation or pricing structure. Entered prices, costs, schedules and scenario choices are your assumptions; this tool does not obtain supplier quotes or predict actual results.

Vorne / OEE.com: Calculating OEE

Calculation methods, testing and sources · Practical calculation guides