Enter shift and line details
Example data table
Use this sample to verify your setup and exports.
| Scenario | Shift (min) | Planned stops (min) | Unplanned downtime (min) | Ideal cycle (sec) | Total units | Defects | OEE (approx) |
|---|---|---|---|---|---|---|---|
| Sample shift | 480 | 30 | 45 | 45 | 520 | 18 | ~78% |
Formulas used
- Planned production time = Shift length − Planned stops
- Operating time = Planned production time − Unplanned downtime
- Availability = Operating time ÷ Planned production time
- Ideal units = (Operating time × 60) ÷ Ideal cycle time (seconds)
- Performance = Total units ÷ Ideal units
- Quality = Good units ÷ Total units, where Good = Total − Defective
- OEE = Availability × Performance × Quality
- Throughput = Total units ÷ (Operating time / 60)
- Takt time = (Planned production time × 60) ÷ Customer demand
- Schedule adherence = Total units ÷ Planned output
- Labor productivity = Total units ÷ Labor hours
- MTTR = Repair downtime ÷ Failures; MTBF = Operating time ÷ Failures
How to use this calculator
- Enter your shift length and planned stops to set available time.
- Add unplanned downtime to capture interruptions and losses.
- Provide ideal cycle time and counts for total and defective units.
- Optionally add demand, planned output, labor hours, and failures.
- Press Calculate Metrics to view KPIs above the form.
- Use the export buttons to download a CSV or PDF report.
FAQs
1) Why can Performance exceed 100%?
If your ideal cycle time is slower than actual running speed, the ratio rises above 100%. Confirm the ideal value and whether micro-stops should be included as downtime.
2) What is the difference between planned stops and unplanned downtime?
Planned stops are scheduled and expected, like breaks or changeovers. Unplanned downtime captures unexpected losses, such as failures, jams, waiting, or lack of material.
3) Should rework units be counted as defective?
Only count units as defective if they are not shippable. Rework is tracked separately here as a rework rate; you can also treat rework as defects if that matches your reporting policy.
4) Which time should I use for Availability?
Use planned production time as the base because it reflects time you intended to produce. This aligns Availability with controllable losses and keeps OEE comparable across shifts.
5) How do I calculate takt time accurately?
Enter customer demand for the same shift or time window. The calculator divides planned production time by demand to produce a seconds-per-unit pacing target.
6) What does schedule adherence tell me?
It compares actual output to the planned target. Values below 100% indicate you missed plan; values above 100% indicate you exceeded it or the plan was conservative.
7) How are MTBF and MTTR used together?
MTBF shows how often failures occur, while MTTR shows how quickly you recover. Improving either reduces downtime; improving both stabilizes production and raises Availability.
8) What inputs most affect OEE?
Unplanned downtime drives Availability, ideal cycle time drives Performance, and defects drive Quality. Start by validating those three inputs, then standardize how you record them.