Eyewear, Lenses & Vision Products worked example

Coating Chamber Utilization at 99% target chamber utilization: a worked example

Push target chamber utilization up to 99% and the picture changes. This example computes every intermediate figure at that operating point. a coating supervisor needs to check whether planned coated lens trays fit available chamber capacity

The inputs for this scenario

  • Loaded coating positions: 420 lens positions (unchanged)
  • Usable chamber capacity: 500 lens positions (unchanged)
  • Target chamber utilization: 99 % (raised for this scenario; the documented default is 90)

Working through the calculation

  • Applying the documented formula (Coating chamber utilization = loaded coating positions ÷ usable chamber capacity × 100) to the inputs above produces each figure below.
  • At this operating point the engine returns 84 % for coating chamber utilization, the number this scenario is built around.
  • At this operating point the engine returns 15 points for utilization shortfall to target.
  • At this operating point the engine returns 420 lens positions for loaded coating positions.
  • At this operating point the engine returns 500 lens positions for usable chamber capacity.

How this compares with the baseline

  • Against the tool's baseline example, where target chamber utilization sits at 90% and the headline result is 84 %, this scenario lands almost exactly on the baseline at 84 %.
  • It computes the percentage of usable coating positions filled in a chamber run and the point gap between that fill rate and your target utilization. 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

  • Coating chamber utilization: 84 % (headline result)
  • Utilization shortfall to target: 15 points
  • Loaded coating positions: 420 lens positions
  • Usable chamber capacity: 500 lens positions

Run it with your numbers

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

Last reviewed 2026-05-12.