How do you calculate composite yield?

Divide the parts that pass first time by the parts inspected or produced, then multiply by 100. With 112 parts passing out of 125 produced, the yield is 89.6%.

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

Well-run composite cells target 90-97% first-pass yield depending on part complexity. At 89.6% against a 95% target, this cell is 5.4 points short and has room to improve before it is at benchmark.

What does the gap to target mean?

It is the difference between actual yield and your goal in percentage points. Here 89.6% versus a 95% target is a 5.4-point gap, meaning about 5 to 7 more parts per 125 would need to pass to hit plan.

How many good parts will I get from a lot?

Multiply lot size by the yield. At 89.6% yield, a 125-part lot yields about 112 good parts, matching the parts-passing input. Plan starts above demand to absorb the scrap.

First-pass yield vs final yield, what is the difference?

First-pass yield counts only parts that pass the first time, with no rework. Final yield includes parts salvaged by rework. First-pass yield is the truer process-health signal because rework hides instability and adds cost.

Why is my composite yield dropping?

In composites the usual culprits are porosity from poor debulk or vacuum loss, wrinkles and bridging on contours, prepreg out-time exceedance, and cure-cycle deviations. Track yield by defect code to see which is driving the loss.

Composites, Fiberglass & Advanced Materials calculator

Composite Yield Calculator

Composite Yield is the first-pass yield of a composites cell: the percentage of parts that pass inspection without rework or scrap. Composite shops watch it closely because cure cycles, autoclave time, and prepreg are expensive, so every rejected part carries heavy material and labor cost. Production supervisors and quality engineers use this number to track process stability across layup, cure, and trim, and to flag when porosity, wrinkles, or bond-line defects start trending. This calculator returns the yield and the exact point gap to your target so you know how far off plan you are.

What this calculator does

Calculate first-pass yield for composite parts, panels, coupons, or assemblies.
tracking first-pass yield for composite manufacturing
It divides composite parts passing first time by parts inspected or produced, expresses it as a percent, and computes the gap in points to your target yield.

Formula used

Composite Yield = composite parts passing first time ÷ composite parts inspected or produced × 100
Gap to target = Composite Yield - target composite first-pass yield

Inputs explained

Composite parts passing first time:
Composite parts inspected or produced:
Target composite first-pass yield:

How to use the result

Use it at end of shift, daily, or per lot to monitor first-pass quality and to quantify how far the cell sits from its yield goal.
It measures only first-pass pass rate; it does not weight defect severity, separate scrap from reworkable rejects, or capture downstream escapes found after the inspection point.

Current U.S. benchmarks

The producer price index for plastic resins and materials stands at 319.371 (BLS, May 2026), up 19.5% from a year earlier. Quotes priced off last quarter's material cost miss this move.
Steel mill PPI stands at 348.53 (BLS, May 2026), up 6.7% from a year earlier. New factory orders are up 2.3% year over year (Census).

Common questions

How do you calculate composite yield? Divide the parts that pass first time by the parts inspected or produced, then multiply by 100. With 112 parts passing out of 125 produced, the yield is 89.6%.
What is a good first-pass yield for composite parts? Well-run composite cells target 90-97% first-pass yield depending on part complexity. At 89.6% against a 95% target, this cell is 5.4 points short and has room to improve before it is at benchmark.
What does the gap to target mean? It is the difference between actual yield and your goal in percentage points. Here 89.6% versus a 95% target is a 5.4-point gap, meaning about 5 to 7 more parts per 125 would need to pass to hit plan.
How many good parts will I get from a lot? Multiply lot size by the yield. At 89.6% yield, a 125-part lot yields about 112 good parts, matching the parts-passing input. Plan starts above demand to absorb the scrap.
First-pass yield vs final yield, what is the difference? First-pass yield counts only parts that pass the first time, with no rework. Final yield includes parts salvaged by rework. First-pass yield is the truer process-health signal because rework hides instability and adds cost.

Last reviewed 2026-05-12.