OEE Calculator
Overall Equipment Effectiveness (OEE) condenses three categories of production loss into one score. Availability captures downtime, performance captures speed losses, and quality captures defects. Multiplying them gives the share of planned production time that was truly productive, making good parts at full speed. This calculator takes planned time, run time, the ideal cycle time, total count, and good count, then returns each factor and the combined OEE. Enter values from your own line; the ideal cycle time should be the fastest rate the equipment can sustain.
OEE formula
Availability = run time / planned production time
Performance = (ideal cycle time * total count) / run time
Quality = good count / total count
OEE = Availability * Performance * Quality
Each factor is a fraction between 0 and 1, shown here as a percentage. The product is the OEE. Performance is capped at 100% because actual output cannot exceed the ideal rate when the ideal cycle time is set correctly.
Reading your OEE
- OEE multiplies three independent loss categories, so a low score in any one factor pulls the whole result down.
- 85% OEE is often cited as world-class for discrete manufacturing; 60% is more typical without active tracking.
- Set the ideal cycle time to the fastest sustainable rate, not an average, or performance will be overstated.
- A high availability with low performance points to minor stops and slow cycles rather than long breakdowns.
- Track each factor separately over time to see which loss to attack first.
OEE: frequently asked questions
What is OEE?
Overall Equipment Effectiveness (OEE) is a single percentage that measures how well a machine or line runs compared to its full potential. It is the product of three factors: availability, performance, and quality. An OEE of 100% means producing only good parts, as fast as possible, with no stop time.
How is OEE calculated?
OEE = Availability x Performance x Quality. Availability is run time divided by planned production time. Performance is the actual output rate divided by the ideal rate (ideal cycle time times total count, divided by run time). Quality is good count divided by total count.
What is a good OEE score?
An OEE of 100% is perfect production. A score of 85% is widely treated as world-class for discrete manufacturers, 60% is fairly typical, and 40% is common for plants without OEE tracking. Compare against your own baseline rather than a universal target, since ideal rates differ by process.
What is the difference between OEE and TEEP?
OEE measures effectiveness during planned production time. TEEP (Total Effective Equipment Performance) measures against all calendar time, including unscheduled hours, by adding a utilization factor. OEE answers how well you run when scheduled; TEEP answers how much of all available time you use.
Why use ideal cycle time for performance?
Performance compares actual speed to the fastest sustainable speed the machine was designed to run. Ideal cycle time is the theoretical minimum time per unit. Using it isolates speed losses (minor stops and slow running) from availability losses, so the three OEE factors do not overlap.
Official sources
- National Institute of Standards and Technology: nist.gov.
- American Society for Quality, six sigma and lean resources: asq.org.
Reviewed by the CalculatorHub team, edited by James Graham, 17 June 2026. See our methodology.