OEE Calculator
The OEE Calculator computes Overall Equipment Effectiveness as Availability x Performance x Quality, the single number for how much saleable output a line actually produced versus its maximum. Example: for a bottling line available 90% of planned time, running at 95% of rated speed, producing 98% good bottles, OEE = 83.8 %, Availability = 90 %, Performance = 95 %, Quality = 98 %, World-class benchmark = 85 % (per Nakajima TPM | ISO 22400-2).
How it works
OEE = Availability x Performance x Quality. Availability = run time / planned production time; Performance = (ideal cycle time x total count) / run time; Quality = good count / total count. For the example: 0.90 x 0.95 x 0.98 = 0.838, i.e. 83.8%.
Worked example (Reliability & Metrics)
Inputs: a bottling line available 90% of planned time, running at 95% of rated speed, producing 98% good bottles.
| Result | Value |
|---|---|
| OEE | 83.8 % |
| Availability | 90 % |
| Performance | 95 % |
| Quality | 98 % |
| World-class benchmark | 85 % |
Computed live by WorkHive's calculation engine; standard: Nakajima TPM | ISO 22400-2.
How to use this calculator
- Enter the figures for the duty you are sizing: the worked example below uses a bottling line available 90% of planned time, running at 95% of rated speed, producing 98% good bottles.
- The calculator returns OEE, Availability, Performance, Quality, World-class benchmark, computed per Nakajima TPM | ISO 22400-2.
- Check the worked example to confirm the method matches how you would do it by hand, then run your own numbers in the interactive tool.
FAQ
How do you calculate OEE?
Multiply the three factors: OEE = Availability x Performance x Quality. For a line available 90% of planned time, running at 95% of rated speed, and producing 98% good units, OEE = 0.90 x 0.95 x 0.98 = 83.8%.
What is a good OEE score?
85% is considered world-class. Most plants start between 40% and 60%, so there is usually a large and inexpensive gap to close: attack availability losses (unplanned downtime, changeovers) first, then speed, then quality.
Why is my OEE lower than my availability?
Because availability is only one of three factors. A line that is available 90% of the time but runs slow and scraps 5% of output lands near 80% OEE. Measuring availability alone is the most common OEE mistake.
Do I need sensors to measure OEE?
No. You can calculate OEE from shift records: planned time, downtime, counts produced, and rejects. A disciplined logbook is enough to start; sensors improve resolution later.
Run it on your own numbers
Open the interactive OEE Calculator in WorkHive: free, no sign-up needed for the calculators.