Availability
Is the machine running when it is supposed to? This measures run time in relation to planned production time.
- Unplanned downtime due to faults and breakdowns
- Changeover and setup, e.g. format or product changes
Toolbox · OEE calculator
OEE calculator with loss waterfall
How much of your planned production time turns into good parts? Enter the figures for one shift. The calculator instantly shows availability, performance, quality and OEE – and where the time is lost.
- Calculates only in your browser
- No storage, no tracking
- Result as an A4 sheet
Result per shift
LivePlease check your details
The result appears as soon as all entries are valid.
OEE overall equipment effectiveness
–
Availability × performance × quality
Availability
–
Run time ÷ planned time
Performance
–
Ideal time ÷ run time
Quality
–
Good count ÷ total count
Values as a table
| Stage | Minutes | Share |
|---|
Your entries stay in your browser. Nothing is sent and nothing is stored – not even when you click “Discuss”.
What if …
What a few percentage points are worth
Move a slider: the calculator shows how many additional good parts are produced – at the same rated speed and the same planned time.
- Additional good parts per year
- –
- per shift
- –
- Good time per year
- –
- OEE before → after
- –
Simplified calculation: each factor is capped at 100%. Whether a factor can be improved, and with how much effort, only becomes clear from an analysis of the loss reasons.
Context
What lies behind the three factors
OEE combines three types of loss in a single figure. A common breakdown is the “Six Big Losses” – six typical losses, two per factor.
Performance
Is it running as fast as it could? This measures the ideal time for the quantity produced in relation to run time.
- Idling and minor stops that often nobody records
- Reduced speed below the rated speed
Quality
Is the result right first time? This measures the good count in relation to the quantity produced.
- Scrap and rework during ongoing production
- Start-up losses after starting up or after a changeover
Compare OEE – only with the same definition. A value is only comparable with another if both are calculated the same way: do breaks and cleaning count as planned time? Is the rated speed the datasheet value or the best ever measured? Does a reworked part count as good? That is why we deliberately do not quote any “industry benchmarks” here. The most meaningful comparison is that of a line with itself over time.
Live demo · MES
How OEE looks in the MES
Calculated by hand, OEE is a snapshot. In the MES, it is calculated continuously: downtime is recorded automatically and assigned a reason, and quantities come directly from the line. In Werk Nord, you can see this with the MES modules from Sepasoft – per line, per shift and per downtime reason.
