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Overall Equipment Effectiveness Calculator

Work out overall equipment effectiveness instantly with clear inputs, formula shown and shareable results.

About Overall Equipment Effectiveness Calculator

OEE is fully productive time as a share of planned production time. Good units multiplied by ideal cycle time gives the minutes that genuinely added value; dividing by planned time captures all three loss categories at once, and dividing by run time isolates the speed-and-quality losses from downtime.

Formulas

OEE (simple method)

OEE % = (Good units x Ideal cycle time) / Planned production time x 100

Availability

Availability % = (Planned time - Downtime) / Planned time x 100

Performance x Quality

P x Q % = Fully productive time / Run time x 100

Worked example

With the default values below, Overall Equipment Effectiveness Calculator returns Overall equipment effectiveness of 79.17%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Planned production time
480 min
Unplanned downtime
47 min
Good units produced
1,140
Ideal cycle time per unit
20 s

Results

Overall equipment effectiveness
79.17%
Availability
90.21%
Performance x Quality
87.76%
Fully productive time
380.0

Step by step

  1. 1Values used
  2. 2OEE (simple method)
  3. 3Availability
  4. 4Performance x Quality
  5. 5Overall equipment effectiveness= 79.17
  6. 6Availability= 90.21
  7. 7Performance x Quality= 87.76
  8. 8Fully productive time= 380.0

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • This is an estimate for general information and not professional financial, tax or legal advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

What is a good OEE?

85% is the widely cited world-class benchmark for discrete manufacturing; 60% is typical and 40% is common in plants that have never measured it.

Should planned maintenance reduce availability?

No. Exclude it from planned production time, otherwise you penalise the plant for doing the right thing.

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