What is a good OEE score?

85% is the figure usually quoted as world-class, built from 90% availability, 95% performance and 99.9% quality. Most measured plants run near 60%. The useful comparison is your own line last month, measured the same way.

Why can performance come out above 100%?

Because the ideal cycle time is set too slow. If the line regularly beats it, the reference is wrong (use the best demonstrated rate) otherwise losses hide inside a flattering performance figure.

Should changeovers count as downtime?

Planned changeovers at standard time can be excluded from planned production time if your site defines it that way; the minutes over standard are unplanned stop time. Write the rule down and keep it fixed, because every trend depends on it.

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OEE calculator: availability × performance × quality

Five numbers from one shift give you OEE, the three factors behind it, and the minutes each one costs: the split you need before deciding what to fix.

Inputs

Planned production time (min)

Shift length minus planned breaks and planned maintenance

Unplanned stop time (min)

Breakdowns, changeovers over standard, waiting for material

Ideal cycle time (seconds per part)

Best demonstrated or nameplate rate

Total parts produced

Good parts (first pass)

The math. Availability = run time ÷ planned time. Performance = (ideal cycle time × total parts) ÷ run time. Quality = good parts ÷ total parts. OEE = A × P × Q = (ideal cycle time × good parts) ÷ planned time.

Readout

OEE·

Availability·

Performance·

Quality·

Minutes lost to stops·

Minutes lost to slow running and micro-stops·

Minutes lost to defects·

Total minutes lost·

World-class OEE is usually quoted at 85% (90% × 95% × 99.9%); measured plants typically run near 60%, and lines measured for the first time often find 40-50%.

What one point is worth where you are

The same formula tells you how many planned hours one extra point frees. Pick your country for the value at national labour and electricity costs: OEE point value by country

Questions

What is a good OEE score?: 85% is the figure usually quoted as world-class, built from 90% availability, 95% performance and 99.9% quality. Most measured plants run near 60%. The useful comparison is your own line last month, measured the same way.
Why can performance come out above 100%?: Because the ideal cycle time is set too slow. If the line regularly beats it, the reference is wrong (use the best demonstrated rate) otherwise losses hide inside a flattering performance figure.
Should changeovers count as downtime?: Planned changeovers at standard time can be excluded from planned production time if your site defines it that way; the minutes over standard are unplanned stop time. Write the rule down and keep it fixed, because every trend depends on it.

Published by TEEPTRAK SAS, which makes production-monitoring and OEE software. The costs are public statistics; the reference line is an assumption, stated so you can change it.

The TEEPTRAK approach

Stop estimating the losses. Measure them on every machine.

The calculators on this site run on your estimates. TEEPTRAK replaces the estimates with measured data: every stop with its duration and reason, every cycle and every scrapped part, machine by machine and shift by shift.

Availability, performance and quality losses recorded automatically, not typed in at the end of the shift
Stop reasons entered by operators at the machine, in their own language
OEE per machine, line and shift, live on the shop floor and in management reports

Used in 450+ factories. At Hutchinson, OEE rose from 47% to 72%. Installed with a module wired into the electrical cabinet and a sensor at the edge of the line. No PLC changes. TEEPTRAK is not an MES: it measures, so you know what to fix first.

See how TEEPTRAK works →What one OEE point is worth in your country →