Cleanroom & Contamination Control worked example

Cleanroom Expansion Payback with cleanroom expansion investment of 3,125,000 $: a worked example

Push cleanroom expansion investment up to 3,125,000 $ and the picture changes. This example computes every intermediate figure at that operating point. a team needs to screen cleanroom expansion projects before detailed design and validation budgeting for a expansion project

The inputs for this scenario

  • Cleanroom expansion investment: 3,125,000 $ (raised for this scenario; the documented default is 1,250,000)
  • Annual capacity, outsourcing, scrap, and downtime savings: 420,000 $ / yr (unchanged)
  • Annual added utilities, cleaning, monitoring, and maintenance cost: 155,000 $ / yr (unchanged)

Working through the calculation

  • Applying the documented formula (Net annual benefit = annual capacity, outsourcing, scrap, and downtime savings - annual added utilities, cleaning, monitoring, and maintenance cost) to the inputs above produces each figure below.
  • At this operating point the engine returns 11.79 yr for cleanroom expansion payback period, the number this scenario is built around.
  • At this operating point the engine returns 265,000 $ / yr for net annual cleanroom expansion benefit.
  • At this operating point the engine returns 3,125,000 $ for cleanroom expansion investment.
  • At this operating point the engine returns -1,800,000 $ for five-year net cleanroom expansion value.

How this compares with the baseline

  • Against the tool's baseline example, where cleanroom expansion investment sits at 1,250,000 $ and the headline result is 4.72 yr, this scenario comes in 150% above the baseline at 11.79 yr.
  • It computes payback period as investment divided by net annual benefit, where net benefit is annual savings minus the added annual cost of running the expanded cleanroom. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Cleanroom Expansion Payback period: 11.79 yr (headline result)
  • Net annual cleanroom expansion benefit: 265,000 $ / yr
  • Cleanroom expansion investment: 3,125,000 $
  • Five-year net cleanroom expansion value: -1,800,000 $

Run it with your numbers

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

Last reviewed 2026-05-12.