On track
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78.4%
OEEavailability × performance × quality
—
Availability × Performance × Quality
Calculator Library / OEE
OEE Calculator and Loss Analyzer
Turn time, count, and loss data into a decision: the headline OEE with a clear world-class / on-track / needs-work call, the Availability×Performance×Quality gauges, a time-cascade of where the shift went, the Six Big Losses ranked, and a shareable one-page report.
SixSigmaKaizen.com · OEE Report
Time cascade
Where the planned time goes
Production run
Minutes for downtime and speed losses; rejected units for the two reject rows (converted to ideal-time minutes for the Pareto).
Pareto
Six Big Losses ranking
| Rank | Loss | Value | Share | Cumulative |
|---|
Trend
Saved run history
| Saved | OEE | A | P | Q | Top Loss |
|---|---|---|---|---|---|
| No saved runs yet. Use Save run to trend. | |||||
Instructions
How to use this app
- Enter planned production time, ideal cycle time, total count, and good count. Everything updates live.
- List the Six Big Losses on separate lines — minutes for downtime and speed losses, rejected units for the two quality-loss rows.
- Read the headline OEE and its world-class / on-track / needs-work call, the A×P×Q gauges, and the time cascade of where the shift went.
- Use the simulator to reduce one loss category and see the projected OEE gain immediately.
- Use Save run to trend for local history, Copy link to share the exact run, or Report to print or save a one-page PDF.
The simulator is directional. It assumes the chosen loss reduction converts directly into productive time or recovered quality output without changing the other factors.
If your reduced-speed losses are not tracked in minutes today, estimate them as the gap between ideal output and actual output converted into time at ideal cycle.
What This OEE Calculator Helps You Measure
OEE brings time loss, speed loss, and quality loss into one practical equipment-performance view. This calculator helps teams move from disconnected downtime notes into Availability, Performance, Quality, total OEE, and a ranked Six Big Losses picture.
That makes it useful for production reviews, TPM activity, shift handoffs, and investment prioritization when leaders need to know which loss category is actually dragging output.
Core OEE Formulas
| Metric | Formula | Meaning |
|---|---|---|
| Availability | Run Time / Planned Production Time | How much scheduled time was actually available to run. |
| Performance | (Ideal Cycle Time x Total Count) / Run Time | How close actual speed stayed to ideal speed. |
| Quality | Good Count / Total Count | How much output was saleable the first time. |
| OEE | Availability x Performance x Quality | Combined picture of time, speed, and quality effectiveness. |
Worked Example
Suppose a line has 480 planned minutes, 430 run minutes, an ideal cycle time of 45 seconds, 520 total units, and 502 good units. Availability is 89.58%, Performance is 89.76%, and Quality is 96.54%, which produces an OEE near 78.4%.
That result says the line is not failing in only one dimension. The calculator then helps break the losses into categories so improvement effort targets the biggest drag instead of reacting to whichever problem was most visible on one shift.
How to Interpret the OEE Output
- Low Availability: breakdowns, changeovers, and waiting losses dominate.
- Low Performance: the line runs, but not at the ideal pace.
- Low Quality: the process is consuming time to make parts that are not good output.
- Strong OEE with weak trend stability: current performance may still be fragile.
- Pareto concentration: if one loss consumes most of the total, attack that category first.
OEE Frequently Asked Questions
What is a good OEE score?
The answer depends on process type, automation level, mix, and maturity. The real value is comparison over time and by asset family, not a generic benchmark alone.
Why does OEE need all three factors?
Because time, speed, and quality losses can hide each other. A line can run often but slowly, or run fast but generate too much scrap.
What are the Six Big Losses?
They are the common TPM loss categories: breakdowns, setup and adjustments, minor stops, reduced speed, startup rejects, and production rejects.
Should rework count as good output?
Usually no for first-pass quality logic. If the part required extra work to become saleable, the process still consumed hidden loss.
What is the most common OEE mistake?
Using OEE as a report card without using the loss breakdown to drive action. OEE alone is only a summary number.
Related Templates and Guides
Download the Lean Standard Work Template
Use standard work to hold gains after an OEE improvement effort changes method, timing, or line balance.
Read the Ergonomics in Kaizen Guide
Use it when speed pressure is colliding with worker strain, repetition risk, or unstable manual work.