How do you calculate coating chamber capacity?

Multiply surfaces per dome load by available runs for gross capacity, then multiply by uptime and first-pass yield. Here 80 x 10 = 800 gross, then x 0.88 x 0.95 = 668.8 good surfaces.

Why is good output so much lower than gross capacity?

In the example, 800 gross drops to 668.8 good — 96 surfaces lost to chamber downtime and 35.2 lost to coating rejects. Pumpdown, maintenance, and yield are the silent capacity killers.

What is a realistic chamber uptime?

Box coaters with regular pumpdown and source changes often land in the 80-90% range over a period; the 88% default is typical. Ion-beam and demanding HR recipes with frequent conditioning can run lower.

How do I increase good coated output?

You can add runs, pack the dome denser, raise uptime by cutting pumpdown and source-change time, or lift first-pass yield. Yield gains compound directly — moving from 95% to 98% recovers most of that 35.2-surface reject loss.

Does dome packing affect quality?

Yes — packing more surfaces per run raises gross capacity but can hurt thickness uniformity at dome edges, so the yield term may drop. Validate yield at the planned load before counting the extra surfaces.

Should rework be counted in first-pass yield?

No. First-pass yield is good on the first deposition. Strippable coatings that get reworked still consume a future run, so model them as additional load, not as first-pass good.

Lasers, Optics & Photonics Manufacturing calculator

Coating Chamber Capacity Calculator

Coating chamber capacity tells you how many good coated surfaces a vacuum deposition chamber can actually deliver in a period — not the theoretical dome count, but output after downtime and coating rejects. Process and capacity planners in thin-film optics, AR/HR coating, and laser-mirror production use it to commit ship dates and decide whether to add a second chamber or a second shift. The gap between gross and good capacity is where most schedules slip, because pumpdown, recipe stabilization, and coating defects quietly eat the calendar. Knowing the real number prevents over-promising on a chamber that looks bigger on paper than it runs in practice.

What this calculator does

Calculate the effective output capacity of a vacuum coating chamber by combining dome load capacity, available coating runs per period, chamber uptime, and coating first-pass yield.
Use this when planning coating production schedules, deciding if you need additional chamber time or a second coating system, or confirming you can meet customer delivery dates.
It computes effective good coated-surface output from dome capacity, available runs, chamber uptime, and first-pass coating yield.

Formula used

Gross coating capacity = surfaces per dome load x available runs
Good coating output = gross capacity x chamber uptime x first-pass yield

Inputs explained

Surfaces per dome load:
Available coating runs per period:
Chamber uptime:
Coating first-pass yield:

How to use the result

Use it during capacity planning, when quoting volume coating work, or when deciding between adding chamber time and adding chambers.
It assumes a single representative recipe and load pattern — mixed jobs with different cycle times and dome configurations will not collapse to one clean number.

Current U.S. benchmarks

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Common questions

How do you calculate coating chamber capacity? Multiply surfaces per dome load by available runs for gross capacity, then multiply by uptime and first-pass yield. Here 80 x 10 = 800 gross, then x 0.88 x 0.95 = 668.8 good surfaces.
Why is good output so much lower than gross capacity? In the example, 800 gross drops to 668.8 good — 96 surfaces lost to chamber downtime and 35.2 lost to coating rejects. Pumpdown, maintenance, and yield are the silent capacity killers.
What is a realistic chamber uptime? Box coaters with regular pumpdown and source changes often land in the 80-90% range over a period; the 88% default is typical. Ion-beam and demanding HR recipes with frequent conditioning can run lower.
How do I increase good coated output? You can add runs, pack the dome denser, raise uptime by cutting pumpdown and source-change time, or lift first-pass yield. Yield gains compound directly — moving from 95% to 98% recovers most of that 35.2-surface reject loss.
Does dome packing affect quality? Yes — packing more surfaces per run raises gross capacity but can hurt thickness uniformity at dome edges, so the yield term may drop. Validate yield at the planned load before counting the extra surfaces.

Last reviewed 2026-05-12.