Calculator form
Use the responsive calculator grid: three columns on large screens, two on medium screens, and one on mobile.
Example data table
This sample table shows how availability, performance, quality, and OEE can vary across lines and products.
| Line | Product | Planned Production Time | Run Time | Availability | Performance | Quality | OEE |
|---|---|---|---|---|---|---|---|
| Line A | Bearing Assembly | 430.00 min | 385.00 min | 89.53% | 88.31% | 97.35% | 76.98% |
| Line B | Valve Core | 380.00 min | 350.00 min | 92.11% | 92.86% | 98.36% | 84.12% |
| Line C | Pump Housing | 470.00 min | 390.00 min | 82.98% | 90.77% | 95.68% | 72.06% |
| Line D | Sensor Cap | 330.00 min | 312.00 min | 94.55% | 91.35% | 99.26% | 85.73% |
Formula used
Because ideal cycle time is entered in seconds per unit, run time is converted to seconds when performance is calculated.
How to use this calculator
- Enter the line or machine name, product, and shift date.
- Input the full shift length in minutes.
- Subtract breaks and any planned downtime such as meetings or scheduled maintenance.
- Enter unplanned downtime, ideal cycle time, total units, and rejected units.
- Press Calculate OEE to view OEE, supporting metrics, charts, and export options above the form.
Frequently asked questions
1) What does OEE measure?
OEE measures how effectively equipment is used during planned production. It combines availability, performance, and quality into one percentage for easier comparison and improvement tracking.
2) What is considered a strong OEE score?
Many manufacturers treat 85% as a strong benchmark, but targets vary by industry, product mix, automation level, maintenance maturity, and data quality.
3) Why can performance exceed 100% in some inputs?
That usually means the ideal cycle time is too slow, downtime is understated, or counts include rework. This calculator caps displayed performance at 100% and shows a warning.
4) What is the difference between planned and unplanned downtime?
Planned downtime includes known stops such as meetings, scheduled cleaning, or changeovers. Unplanned downtime includes breakdowns, jams, missing materials, or unexpected operator delays.
5) Should changeovers be entered as planned downtime?
Yes, if your site treats them as scheduled production losses. Keep the rule consistent across lines so OEE comparisons remain fair and useful.
6) Why is quality based on good units only?
Quality reflects the share of production that meets requirements the first time. Scrap and rejects lower the quality rate because they consume time without creating sellable output.
7) Can I compare OEE across different machines?
Yes, but use consistent definitions for downtime, counts, and ideal cycle time. Otherwise the comparison may reflect measurement differences instead of real performance.
8) How often should OEE be reviewed?
Review it every shift for daily control, then summarize by day, week, and month. Frequent review helps teams spot recurring losses sooner.