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Overall Equipment Effectiveness (OEE) Calculator

Enter availability, performance and quality percentages to get overall equipment effectiveness.

How it is calculated

The tool multiplies three percentages: OEE = (A / 100) × (P / 100) × (Q / 100) × 100, where A is availability (run time as a share of planned production time), P is performance (actual speed as a share of ideal speed) and Q is quality (good units as a share of all units made). Each field must be between 0 and 100; a value outside that range, or an empty field, returns no result. The result is shown as a percentage rounded to two decimals. Because the factors are multiplied, OEE is always lower than the weakest single factor.

Worked example

A packaging line has availability 90%, performance 95% and quality 98%. Step 1: 0.90 × 0.95 = 0.855. Step 2: 0.855 × 0.98 = 0.8379. Step 3: as a percentage that is 83.79%. Even though every individual factor looks healthy, the line turns only about 84% of its planned time into good output at ideal speed.

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Common mistakes

  • Typing a fraction such as 0.9 instead of 90 — the fields expect percentages, so 0.9 means 0.9% and the OEE collapses to almost zero.
  • Averaging the three factors instead of multiplying them: 90, 95 and 98 average 94.3%, but the real OEE is 83.79%.
  • Counting planned breaks or changeovers inconsistently — decide whether they reduce planned production time or count as downtime, and keep that rule the same between periods.
  • Using total units instead of good units when working out quality, which hides scrap and rework.
  • Entering a performance figure above 100 because a machine ran faster than its rated speed; the tool rejects it, so re-base the ideal speed instead.

Sources

About this calculator

OEE (Overall Equipment Effectiveness) is the gold-standard manufacturing metric from Total Productive Maintenance, defined as Availability × Performance × Quality, where each factor is itself a percentage: availability is uptime versus planned production time, performance is actual output speed versus ideal speed, and quality is good units versus total units produced.

Multiplying the three together reveals how much of the originally scheduled production time was spent making good parts at full speed with no stoppages — a world-class OEE is generally considered to be around 85%, while many plants that have never measured it discover they are running closer to 60%. Plant managers and Six Sigma / Lean teams use OEE to pinpoint whether losses come from downtime, speed, or scrap, and to track improvement over time.

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