OEE Calculator & Loss Tree
Your OEE score, split into availability, speed, and quality losses, with the dollar value of each.
Example scenario—not a forecast or verified benchmark. Enable JavaScript to edit inputs, view charts, save locally and export your analysis.
Example inputs
- Planned production time
- 80
- Unplanned downtime + changeovers
- 12
- Ideal run rate
- 60
- Total units produced
- 3,600
- Defective / scrapped / reworked units
- 108
- Contribution margin per good unit
- 4
- Material + labor wasted per defective unit
- 6
- Operating weeks per year
- 50
- Your OEE target
- 85
Example results
OEE is 72.8% (A 85% × P 88% × Q 97%); losses cost about $294K a year, led by availability.
- OEE
- 72.8%
- Annual cost of OEE losses
- $294,000
- Value of reaching 85% OEE
- $117,600
- Availability
- 85%
- Performance
- 88.2%
- Quality
- 97%
- Good units per week
- 3,492
- Lost output per week
- 1,308
What stands out
Availability 85%
12 of 80 planned hours are lost each week, 720 units of output ($144K/yr).
Performance 88.2%
When running, the line averages 52.9 units/hr vs. an ideal 60. That is 480 units a week ($96K/yr).
Quality 97%
108 defective units a week cost about $54K/yr in lost margin plus wasted material and labor.
Reaching 85% OEE is worth $118K a year
That is 588 more good units per week from the same equipment and hours.
Next actions
- Log every stop over 5 minutes with a reason code for 4 weeks, then attack the top two causes (often changeovers and material shortages). SMED-style setup reduction typically pays back fast.
- Find out why the line runs below rated speed: micro-stops, operator pacing, or worn tooling. Post an hourly target vs. actual board at the line.
- Track OEE by shift weekly on a single sheet; the trend matters more than the absolute number.
Model assumptions & limitations
- OEE = availability × performance × quality (standard definition); planned downtime is excluded from planned time.
- Lost units are valued at contribution margin, which assumes the extra output can be sold.
- Target OEE of 85% is your input; 85% is a commonly cited world-class figure, and typical plants run well below it. Verify against your own industry.
- Changeovers are counted as availability loss.