Free tool
OEE calculator
Enter one shift’s numbers for one machine and get availability, performance, quality, and OEE — with the math shown, not hidden.
A result in the 40–60% range is typical for plants measuring honestly for the first time. The gap to your target is the hidden capacity you already own.
How the calculation works
Availability = run time ÷ planned production time. Run time is planned time minus all stops. Whether breaks and planned maintenance count against availability is a policy decision — pick one definition and apply it everywhere.
Performance = (ideal cycle time × total parts) ÷ run time. It captures speed losses: slow cycles, micro-stops, reduced feeds. If it comes out above 100%, your ideal cycle time is set wrong — a common and quietly corrosive problem, because it hides real speed losses.
Quality = good parts ÷ total parts, counting only right-first-time as good.
OEE is the product of the three. The point is not the headline number — it is which of the three components is eating your capacity, because each has a completely different fix.
This calculator is for a single machine over a single period. ThingConnect computes it continuously, for every machine, from controller data — with your plant’s own availability rules.