How is first-pass yield different from final yield?

First-pass yield counts only parts accepted at the first inspection. Reworked parts raise final yield but not first-pass yield, and the difference is the rework loop.

Why can parts passing exceed parts inspected?

They cannot. Passing parts come from the inspected population, so a larger passing count means the two counts cover different lots. The page blocks that entry.

What is a good first-pass yield for composite layup?

It depends on the part and the customer; many shops target 95 percent or better on mature parts. Set the target from your own history first, then tighten it.

Does a rejected part always become scrap?

No. Some rejects are reworkable, so separate rework from scrap when you price the loss. This page counts both together as rejected or reworked.

Composites, Fiberglass & Advanced Materials calculator

Composite Yield Calculator

Find the share of parts that pass the first inspection and how far that yield sits from your target. The reject count shows what the rework loop absorbs.

What this calculator does

First-pass yield for a composite lot, the gap to the target you enter, and the parts rejected or reworked.

Formula used

First-pass yield = parts passing first time ÷ parts inspected × 100
Gap to target = target first-pass yield − first-pass yield, in points
Rejected or reworked parts = parts inspected − parts passing first time

Inputs explained

Parts Passing First Time: Parts accepted at the first inspection, from the quality record.
Parts Inspected: Parts started or inspected in the same period, from the record.
Target First-Pass Yield: Target from the quality plan or contract, in percent.

How to use the result

Best suited to tracking first-pass yield per lot, setting a yield target for a new part, comparing two cells on the same part.
First-pass yield says nothing about defect severity or the cost of the rework loop. Escapes found after the inspection gate are not counted here.

Current U.S. benchmarks

The producer price index for plastic resins and materials stands at 280.569 (BLS, Aug 2026), up 6.6% from a year earlier. Quotes priced off last quarter's material cost miss this move.
Steel mill PPI stands at 381.162 (BLS, Aug 2026), up 23.4% from a year earlier. New factory orders are up 8.5% year over year (Census).

Common questions

How is first-pass yield different from final yield? First-pass yield counts only parts accepted at the first inspection. Reworked parts raise final yield but not first-pass yield, and the difference is the rework loop.
Why can parts passing exceed parts inspected? They cannot. Passing parts come from the inspected population, so a larger passing count means the two counts cover different lots. The page blocks that entry.
What is a good first-pass yield for composite layup? It depends on the part and the customer; many shops target 95 percent or better on mature parts. Set the target from your own history first, then tighten it.
Does a rejected part always become scrap? No. Some rejects are reworkable, so separate rework from scrap when you price the loss. This page counts both together as rejected or reworked.

Last reviewed 2026-10-01.