OEE Calculator

Calculates Overall Equipment Effectiveness (OEE) from shift time, stops, ideal cycle time, total count and rejects, and splits it into availability, performance and quality. Use it to see where a machine loses productive time.

How to use

1. Enter "Shift length", "Planned stops" and "Unplanned stops (downtime)" in minutes.
2. Under "Speed basis", choose "Ideal cycle time" (seconds) or "Standard rate per hour" and enter the value.
3. Enter "Total count" and "Reject count"; OEE, the three factors and the "Loss time waterfall" appear at once.
4. To include calendar time, turn on "Also calculate TEEP (calendar time basis)" and enter "Calendar time".

How it works

• OEE = availability × performance × quality. Availability = run time ÷ planned production time, performance = (ideal cycle time × total count) ÷ run time, and quality = good count ÷ total count.
• The "Loss time waterfall" subtracts planned stops, availability loss, performance loss and quality loss from the shift, leaving fully productive time.
• TEEP = OEE × utilization, where utilization = planned production time ÷ calendar time.

Questions and answers

What is the formula for OEE?

Availability × performance × quality, which equals (ideal cycle time × good count) ÷ planned production time. The default example gives 88.81% × 86.11% × 97.80% = 74.79%.

What is the difference between availability and performance?

Availability is the share of planned time the machine actually ran. Performance compares the output during that run time with what the ideal speed would give. Breakdowns lower availability; slow cycles lower performance.

Why is performance above 100%?

The ideal cycle time you entered is slower than the real top speed. Enter the fastest possible cycle time from the design or nameplate instead.

Is 85% OEE the standard?

It is a commonly quoted reference, not a standard. It varies by industry and equipment, so compare results with the trend of the same machine.