OEE Calculator - what your equipment actually produces vs what it could.
OEE (Overall Equipment Effectiveness) = Availability x Performance x Quality. A world-class plant runs about 85%. Most factories that do not track it run 40 to 60%. Enter your shift numbers below to get your OEE and the single biggest loss, in dollars.
OEE is the gold-standard metric for manufacturing productivity. It rolls availability, speed, and quality into one number. Most plants without OEE tracking score 40-60%. Top decile is 85%+. This tool shows you exactly where the gap is.
Production data (per shift or per day)
SimpleGrid captures OEE from production flow - no manual logging.
Every cycle, every stop, every defect posts to the event ledger. OEE updates live. Bottleneck reveals itself. You stop chasing the wrong machines.
Book a demoOEE = Availability x Performance x Quality
OEE was developed by Seiichi Nakajima as part of Total Productive Maintenance (TPM) at Nippondenso in the 1960s. It captures the six big losses that reduce equipment effectiveness: breakdowns, changeover, idling/minor stops, reduced speed, process defects, startup rejects.
- Availability: actual running time / planned production time. Target 90%+.
- Performance: actual output / (running time x ideal cycle time). Target 95%+.
- Quality: good units / actual output. Target 99.9%+.
The 85% top-decile threshold
OEE of 85% (often shown as 90% x 95% x 99.9%) is the top decile - only about 10% of manufacturing plants hit it. Most plants without active OEE tracking sit in the 40-60% range. The gap between current and the top decile is usually 20-40 percentage points - which translates to 25-65% more output from the same equipment.
FAQ
My Performance % is over 100. What does that mean?
Your "ideal cycle time" is too conservative. Either you're under-stating what the machine can do, or your operators have learned to beat the nameplate speed. Recalibrate ideal cycle time - use the fastest sustained pace you've ever achieved.
Should I track OEE per machine or per line?
Start at the bottleneck. OEE on a non-bottleneck machine is interesting but doesn't change throughput. Track the constraint first - it's the only metric that moves the system.