OEE Calculator
Work out Overall Equipment Effectiveness for any machine, line or shift. Enter your planned time, downtime and unit counts to see your OEE, the availability, performance and quality breakdown, and exactly where you are losing points. Download a PDF report to share with your maintenance team.
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What OEE measures and why it matters
Overall Equipment Effectiveness turns three separate questions into one number: was the asset available to run, did it run at the right speed, and did it produce good units. Multiplying availability, performance and quality gives a single percentage you can track shift to shift. Because the three factors multiply rather than add, a modest dip in each one compounds. An asset at 90% availability, 90% performance and 90% quality is only running at about 73% OEE, which is why the headline number is often lower than operators expect.
The 85% figure is the benchmark most commonly quoted for discrete manufacturing, while many operations sit nearer 60% before they start a structured improvement programme. The value of OEE is less about hitting an absolute target and more about seeing the trend and knowing which factor is costing you the most. Use the calculator above to get your current baseline, then track it over time as you work on the biggest loss.
How to read the availability, performance and quality split
Availability drops when the asset is stopped when it was meant to be running, so breakdowns, long changeovers and waiting for parts all show up here. Performance drops when the asset runs slower than its ideal cycle time or suffers lots of minor stops. Quality drops when units are rejected or need rework. Splitting your OEE this way tells you where to look first: a low availability score points at maintenance and changeovers, a low performance score points at speed and minor stoppages, and a low quality score points at defects and startup scrap.
The losses table on this page expresses each factor in OEE percentage points so the three losses plus your OEE add back up to 100%. That makes it easy to rank them and attack the largest one. Reliable numbers matter here: if run time and downtime are estimated from memory, the split is only as good as the guess. Capturing that data against each asset with maintenance tracking removes the guesswork and keeps your OEE honest.
How asset tracking software helps you track OEE
A one-off OEE calculation is useful, but the real gains come from watching the trend and acting on it. That is hard to do in a spreadsheet that someone has to fill in by hand every shift. Asset tracking software records run time, downtime events and maintenance history against each asset automatically, so your availability and OEE stay current without re-keying, and you can see whether a change actually moved the number.
MapTrack keeps a live register of every asset with its service history, downtime and maintenance schedule in one place. Combine that captured data with built-in reporting to trend availability and OEE over weeks and months, and pair it with the downtime cost calculator to put a dollar figure on the losses this calculator surfaces. See how other operators run it in our customer stories.
Frequently asked questions
What is OEE (Overall Equipment Effectiveness)?
OEE stands for Overall Equipment Effectiveness. It is a single percentage that shows how much of your planned production time was genuinely productive. It combines three factors: how often the equipment was available to run, how fast it ran when it was running, and how many of the units it produced were good. An OEE of 100% would mean the asset made only good parts, as fast as theoretically possible, with no stops.
What is the OEE formula?
OEE = Availability x Performance x Quality. Availability = run time divided by planned production time, where run time is planned time minus unplanned downtime. Performance = (ideal cycle time x total units produced) divided by run time. Quality = good units divided by total units produced. For example, a shift of 480 planned minutes with 60 minutes of downtime, a 60 second ideal cycle time, 400 units produced and 16 rejects gives 87.5% x 95.2% x 96.0% = 80.0% OEE.
What is a good OEE score?
85% is the figure most often cited as the benchmark for discrete manufacturing, and reaching it consistently is a strong result. Many operations sit closer to 60% before they start a structured improvement programme, and anything below 40% usually points to a few large, fixable losses. Rather than chasing an absolute number, most teams track their own OEE trend over time and aim to close the gap on the single biggest loss first.
What is the difference between availability, performance and quality?
Availability measures lost time: it drops when the asset is stopped by breakdowns, changeovers or waiting for parts. Performance measures lost speed: it drops when the asset runs slower than its ideal cycle time or suffers minor stops. Quality measures lost output: it drops when units are rejected or need rework. Multiplying the three together gives OEE, which is why a small dip in each factor can still produce a large drop in the overall score.
How do I improve my OEE?
Start by identifying which of the three factors is costing you the most points, then work on the biggest single loss inside it. To lift availability, reduce unplanned breakdowns with preventive maintenance and speed up changeovers. To lift performance, address minor stops and the causes of slow running. To lift quality, tackle the defects and rework driving your reject count. Reliable run time and downtime data is essential, which is where an asset and maintenance system helps.
Can I download the OEE result as a PDF?
Yes. Enter your shift numbers, then click the "Download PDF report" button to generate a branded PDF with your OEE, the availability, performance and quality breakdown, your losses, and the inputs you used. Share it with your maintenance team, include it in a business case, or file it with your production records.
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