Free tool
Free online OEE calculator
OEE (Overall Equipment Effectiveness) is calculated by multiplying availability, performance and quality. Enter one shift’s planned time, downtime, ideal cycle time and total and defective pieces: this free calculator returns the three factors and the resulting OEE, with no sign-up and no data leaving your browser.
Calculadora de OEE
Disponibilidad
87,5 %
385 / 440 min
Rendimiento
90 %
13.860 / 15.400 uds
Calidad
95,2 %
13.200 / 13.860 uds
OEE
75 %
D × R × C
How OEE is calculated
OEE combines three factors, each expressed as a percentage:
- Availability = operating time / planned time. Operating time is planned time minus unplanned downtime and changeovers.
- Performance = produced pieces / theoretical pieces at ideal cycle time (operating time ÷ ideal cycle time).
- Quality = good pieces / total pieces, discounting rejects and rework.
OEE = Availability × Performance × Quality. The pre-loaded example (bottling line, one 8-hour shift) yields A = 87.5%, P = 90.0%, Q = 95.2% and an OEE of 75%.
If performance comes out above 100%, it almost always indicates a badly defined ideal cycle time or real downtime classified as planned. The full detail on definition, losses and measurement pitfalls is in the complete OEE guide.
From one-off calculation to sustained improvement
Calculating one shift’s OEE is the first step; the real value appears when the metric is captured continuously and drives decisions. At Captia Consulting we cover that journey with the operational diagnosis and continuous improvement programmes, identifying where your line loses capacity and how to recover it.
Frequently asked questions
- How is OEE calculated?
- OEE = Availability × Performance × Quality. Availability compares operating time with planned time; performance compares produced pieces with the theoretical output at ideal cycle time; quality compares good pieces with total pieces. The three factors are expressed as percentages and multiplied together.
- What is a good OEE value?
- The usual benchmark places 85% as "world class" for discrete manufacturing, while many plants operate in the 40-60% range. More important than the absolute number is measuring with consistent criteria and using the A × P × Q breakdown to locate where capacity is lost.
- What data do I need to use the calculator?
- Five figures from a shift or period: planned production time (minutes), unplanned downtime and changeovers (minutes), ideal cycle time (seconds per piece), total pieces produced and defective pieces. With that, the calculator returns availability, performance, quality and the resulting OEE.
- Is the calculator free and does it store my data?
- It is free and runs entirely in your browser: the calculation is client-side arithmetic, with no network calls and no persistence. We do not send or store any production data you enter.