How do you calculate web yield defect rate?

Divide the defective count by the total inspected and express as a percentage. Here 8 defects out of 250 prints is 8 / 250 = 3.2%. Good-part yield is the complement, 96.8%.

What does the gap to target mean here?

It is the target benchmark minus the calculated rate in percentage points. With a 95% target and a 3.2% defect rate, the tool reports a 91.8-point gap, showing your defect rate sits well inside a 95-point target ceiling.

What is a good defect rate for roll-to-roll printed electronics?

It depends on device complexity, but mature functional-print lines often target low single-digit defect percentages. A 3.2% defect rate is respectable for many FHE devices, though demanding applications push for well under 1%.

Defect rate vs yield - what's the difference?

Defect rate is the fraction bad; yield is the fraction good. They sum to 100%. A 3.2% defect rate equals a 96.8% good-part yield. Report whichever your customer specifies and be consistent.

How many prints should I inspect for a reliable rate?

The larger the sample, the more stable the rate. Eight defects in 250 prints gives a usable trend point, but a single roll of thousands of devices yields far tighter confidence and catches rare failure modes.

How do I lower the web defect rate?

Attack the dominant defect type first, whether registration drift, pinholes or shorts, since a Pareto usually concentrates loss. Halving the 8 defects to 4 on the same 250 prints would cut the rate from 3.2% to 1.6%.

Printed Electronics & Flexible Hybrid Electronics calculator

Web Yield Calculator

Web Yield measures the defect rate across a roll-to-roll printed electronics web and shows the gap between that rate and your target. On continuous flexible-electronics lines, a single web can carry thousands of printed devices, and even a low percentage of shorts, opens or registration faults translates into meaningful scrap. Quality engineers and line supervisors use it to trend web health, trigger interventions and report against a yield benchmark. It turns a raw defect count into a rate and a clear distance-to-target.

What this calculator does

Web Yield measures the defect rate across a roll-to-roll printed electronics web and shows the gap between that rate and your target.
Use it when web yield in printed electronics and flexible hybrid electronics needs a clean rate and gap-to-target you can put on a tier board.
It computes the defect rate as defective prints divided by total prints inspected, and the gap in points between your target benchmark and that rate.

Formula used

Web Yield rate = affected amount ÷ total amount
Gap to target = target rate - calculated rate

Inputs explained

Defective prints on the web:
Total prints inspected on the web:
Target yield or defect benchmark:

How to use the result

Use it during or after a roll to gauge web health, decide whether to stop and correct, and report yield against a benchmark.
A single rate treats all defects as equal and ignores clustering; a web with faults bunched at one edge can share the same rate as a uniformly scattered one but needs a very different fix.

Current U.S. benchmarks

The producer price index for copper and brass mill shapes stands at 559.593 (BLS, May 2026), up 76.8% from a year earlier. Quotes priced off last quarter's material cost miss this move. Global copper trades at $13,484 per tonne (IMF via FRED, May 2026).
The U.S. has 11,261 computer and electronic products establishments employing about 815,443 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate web yield defect rate? Divide the defective count by the total inspected and express as a percentage. Here 8 defects out of 250 prints is 8 / 250 = 3.2%. Good-part yield is the complement, 96.8%.
What does the gap to target mean here? It is the target benchmark minus the calculated rate in percentage points. With a 95% target and a 3.2% defect rate, the tool reports a 91.8-point gap, showing your defect rate sits well inside a 95-point target ceiling.
What is a good defect rate for roll-to-roll printed electronics? It depends on device complexity, but mature functional-print lines often target low single-digit defect percentages. A 3.2% defect rate is respectable for many FHE devices, though demanding applications push for well under 1%.
Defect rate vs yield - what's the difference? Defect rate is the fraction bad; yield is the fraction good. They sum to 100%. A 3.2% defect rate equals a 96.8% good-part yield. Report whichever your customer specifies and be consistent.
How many prints should I inspect for a reliable rate? The larger the sample, the more stable the rate. Eight defects in 250 prints gives a usable trend point, but a single roll of thousands of devices yields far tighter confidence and catches rare failure modes.

Last reviewed 2026-05-12.