OEE Calculator (Overall Equipment Effectiveness)
Calculate overall equipment effectiveness from availability, performance, and quality — the standard manufacturing productivity measure.
Formula & Reference
| Variable | Symbol | Formula | Units |
|---|---|---|---|
| OEE Calculator (Overall Equipment Effectiveness) | — | OEE = availability × performance × quality | percent |
Step-by-Step Examples
480 min planned, 47 min downtime, 19,271 units, 0.02 min ideal cycle, 423 defects.
- Run time = 480 − 47 = 433 min
- Availability = 433 / 480 = 90.2%
- Performance = (0.02 × 19,271) / 433 = 89.0%
- Quality = (19,271 − 423) / 19,271 = 97.8%
- OEE = 0.902 × 0.890 × 0.978 = 78.5%
480 min planned, 160 min downtime, 12,000 units, 0.025 min cycle, 100 defects.
- Availability = 320 / 480 = 66.7%
- Performance = (0.025 × 12,000) / 320 = 93.8%
- Quality = 99.2%
- OEE = 62.0% — availability is the constraint
480 min planned, 30 min downtime, 20,000 units, 0.02 min cycle, 3,000 defects.
- Availability = 93.8%, Performance = 88.9%
- Quality = 17,000 / 20,000 = 85.0%
- OEE = 70.9% — quality is dragging the result
Real-World Applications
Common Mistakes to Avoid
OEE depends on how planned production time is defined. Two sites using different definitions produce incomparable numbers.
Removing changeovers and maintenance from planned time raises OEE without improving anything. Consistency matters more than the headline figure.
World class is around 85%. Pushing beyond that typically means running equipment without adequate maintenance, which fails later.