Short answer
OEE calculator
Change any number; the result updates as you type. The defaults are one shift on a CNC turning centre.
Your OEE
71.3%
Typical for a shop that measures. The gap to 85% is the hidden factory.
- Availability
- 86.2%
- 388 of 450 min running
- Performance
- 84.5%
- 410 of 485 possible pcs
- Quality
- 97.8%
- 401 of 410 good
Downtime alone cost about 77 pieces this shift at the ideal cycle.
Which formulas does the calculator use?
| Factor | Formula | Default shift |
|---|---|---|
| Availability | Run time ÷ planned production time | 388 ÷ 450 = 86.2% |
| Performance | Ideal cycle time × total pieces ÷ run time | 48 s × 410 ÷ (388 × 60 s) = 84.5% |
| Quality | Good pieces ÷ total pieces | 401 ÷ 410 = 97.8% |
| OEE | Availability × Performance × Quality | 71.3% (multiplied before rounding) |
The full method, with a worked example and the four mistakes that flatter OEE, is in how to calculate OEE for a CNC job shop.
What does your OEE result mean?
According to OEE.com, 85% is considered world-class for discrete manufacturing — a benchmark that goes back to Seiichi Nakajima's TPM work in Japan — while most manufacturers are closer to 60%, and more plants score below 45% than above 85%.
Job shops run more setups and part changes than high-volume lines, so a job-shop machine is best compared with itself, week on week. The useful question is not “is my number good?” but “which of the three factors is lowest, and what is the biggest reason inside it?” — usually setups and waiting inside availability.
OEE, TEEP, OPE and utilisation — which number is which?
| Measure | Compares output with | Use it for |
|---|---|---|
| OEE | The machine's ideal during planned production time | Losses you can fix on a machine: stops, slow cycles, rejects |
| TEEP | The machine's ideal over all calendar time (OEE × utilisation) | Whether to add shifts before buying another machine |
| OPE | The whole process, including manual steps and often planned stops | Process-level improvement; definitions vary by company |
| Utilisation | How much of the calendar the machine ran at all | Capacity planning — it ignores speed and quality |
For a longer comparison of OEE and OPE, see Tulip's explainer.
Stop calculating OEE by hand.
OpeEye computes OEE per machine and per job from what happens on the floor — live, from the first shift. Free 15-day trial.
OEE calculator — questions
How do I calculate OEE online?
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Enter five numbers from one shift: planned production time, downtime, ideal cycle time, total pieces and rejected pieces. The calculator returns availability, performance, quality and OEE. For a shift with 450 planned minutes, 62 minutes of stops, a 48-second cycle, 410 pieces and 9 rejects, OEE is 71.3%.
What is the OEE formula?
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OEE = Availability × Performance × Quality. Availability = run time ÷ planned production time. Performance = (ideal cycle time × total pieces) ÷ run time. Quality = good pieces ÷ total pieces.
What is a good OEE score?
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85% is considered world-class for discrete manufacturing, while most manufacturers are closer to 60% (OEE.com). Job shops with many setups usually sit lower than high-volume lines, so compare each machine with itself over time.
Can OEE be more than 100%?
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No. An OEE above 100% means one of the inputs is wrong — usually an ideal cycle time slower than the machine really runs, or pieces counted twice.
What is the difference between OEE and OPE?
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OEE measures one machine against its own ideal during planned production time. OPE — overall process (or production) effectiveness — widens the view to the whole process, including manual steps, people and often planned stops, so it usually reads lower. Definitions of OPE vary between companies, so write down which losses yours includes before comparing numbers.
Should setup time count as downtime?
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Yes. In standard OEE, setup and changeover are availability losses because the machine is not producing. Many job shops also track setup separately, because it is the loss they can reduce most.
Does this calculator save or send my numbers?
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No. It runs entirely in your browser; nothing you type is stored or sent anywhere.
Related
- How to calculate OEEThe formula, a worked example on a turning centre, and a calculator.
- OEE softwareAvailability × performance × quality, computed from real floor events.
- Daily production report formatFree Excel and printable templates, a worked example and every formula.
- Industry 4.0Industry 4.0 for MSMEs, in plain words — start with the machines you have.