Cleanroom & Contamination Control worked example

Cleanroom Capacity at 99% room availability after cleaning and maintenance: a worked example

What does the result look like when room availability after cleaning and maintenance reaches 99%? The full calculation is worked below with real intermediate numbers. a team needs to commit cleanroom schedules while accounting for cleaning, monitoring, and quality release losses for a cleanroom production suite

The inputs for this scenario

  • Qualified lots or batches per cleanroom cycle: 2 lots / cycle (unchanged)
  • Available cleanroom production cycles: 120 cycles (unchanged)
  • Room availability after cleaning and maintenance: 99 % (raised for this scenario; the documented default is 87)
  • First-pass release yield after cleanroom checks: 96 % (unchanged)

Working through the calculation

  • Applying the documented formula (Gross cleanroom capacity = qualified lots or batches per cleanroom cycle × available cleanroom production cycles) to the inputs above produces each figure below.
  • At this operating point the engine returns 228 valid outputs for usable cleanroom capacity, the number this scenario is built around.
  • At this operating point the engine returns 240 valid outputs for gross cleanroom capacity.
  • At this operating point the engine returns 2.4 valid outputs for cleanroom capacity lost to room or instrument downtime.
  • At this operating point the engine returns 9.5 valid outputs for cleanroom capacity lost to invalid samples, rejects, or holds.

How this compares with the baseline

  • Against the tool's baseline example, where room availability after cleaning and maintenance sits at 87% and the headline result is 200 valid outputs, this scenario comes in 13.79% above the baseline at 228 valid outputs.
  • A figure at this level is achievable when room availability after cleaning and maintenance is genuinely sustained, not just peaked for a shift. It applies availability and yield as flat averages — a cleanroom with one disruptive maintenance event or a clustered batch failure can deviate sharply from the smoothed estimate.

Results at a glance

  • Usable cleanroom capacity: 228 valid outputs (headline result)
  • Gross cleanroom capacity: 240 valid outputs
  • Cleanroom Capacity lost to room or instrument downtime: 2.4 valid outputs
  • Cleanroom Capacity lost to invalid samples, rejects, or holds: 9.5 valid outputs

Run it with your numbers

  • Every input above is editable in the live Cleanroom Capacity calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.