How do you calculate film extrusion yield?

Divide good film footage by total footage extruded and multiply by 100. With 18,500 good linear ft out of 20,000 extruded, yield is 18,500 / 20,000 x 100 = 92.5%.

What is a good film extrusion yield?

Mature blown-film and cast lines typically run 92-97% on footage. The 92.5% in the example sits at the low end of acceptable and trails a 95% target by 2.5 points, signaling startup scrap or gauge issues worth investigating.

Why is my yield below target?

The most common causes are long startup transitions, frequent gauge-band rejects, excessive edge trim, and gels or die lines forcing reruns. The 2.5-point gap here equals 500 ft of lost good film per 20,000 ft run.

Is footage yield the same as resin yield?

No. Footage yield counts length only. If you trim wide edge bead or run heavy gauge, resin yield by weight can be several points worse than footage yield, so track both for a true cost picture.

How is the gap to target calculated?

Subtract the target yield from the actual yield. Here 92.5% minus a 95% target gives a -2.5 point gap, meaning the line fell 2.5 points short.

How do I improve extrusion yield quickly?

Cut startup waste with faster line speed ramps, tighten auto-gauge profile control, and reduce changeover frequency. Closing the 2.5-point gap on a 20,000 ft run recovers 500 ft of saleable film.

Industrial Packaging Materials Manufacturing calculator

Film Extrusion Yield Calculator

Film extrusion yield is the percentage of total extruded footage that ships as good, saleable film after edge trim, gauge-band scrap, and startup waste are pulled out. Extrusion supervisors and process engineers on blown- and cast-film lines watch it because resin and energy are the two biggest cost drivers in flexible packaging, and every point of yield lost is resin that went to the regrind hopper instead of a customer order. It is the cleanest single number for judging whether a die, screw profile, and chill setup are dialed in. Tracking it shift-over-shift exposes drifting gauge control before it shows up as a margin miss at month-end.

What this calculator does

Calculate first-pass yield for blown or cast film extrusion lines by comparing good output footage against total extruded footage, then measure the gap to your target yield.
Use this when reviewing extrusion line performance, tracking scrap from edge trim, gauge variation, gels, or startup waste, and deciding whether corrective action is needed to hit yield targets.
It computes the share of total extruded film footage that is good, plus the point gap between that yield and your target rate.

Formula used

Film extrusion yield rate = good film footage produced / total film footage extruded x 100
Gap to target = film extrusion yield rate - target yield rate

Inputs explained

Good film footage produced:
Total film footage extruded:
Target yield rate:

How to use the result

Use it at the end of each run or shift to grade a film line and decide whether scrap is within tolerance before releasing the roll set.
Footage-based yield ignores width and gauge, so a line trimming heavy edge bead or running off-spec thickness can hit good footage while still wasting resin by weight.

Current U.S. benchmarks

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The producer price index for paperboard and containers stands at 276.831 (BLS, May 2026), up 8.8% from a year earlier. Quotes priced off last quarter's material cost miss this move.

Common questions

How do you calculate film extrusion yield? Divide good film footage by total footage extruded and multiply by 100. With 18,500 good linear ft out of 20,000 extruded, yield is 18,500 / 20,000 x 100 = 92.5%.
What is a good film extrusion yield? Mature blown-film and cast lines typically run 92-97% on footage. The 92.5% in the example sits at the low end of acceptable and trails a 95% target by 2.5 points, signaling startup scrap or gauge issues worth investigating.
Why is my yield below target? The most common causes are long startup transitions, frequent gauge-band rejects, excessive edge trim, and gels or die lines forcing reruns. The 2.5-point gap here equals 500 ft of lost good film per 20,000 ft run.
Is footage yield the same as resin yield? No. Footage yield counts length only. If you trim wide edge bead or run heavy gauge, resin yield by weight can be several points worse than footage yield, so track both for a true cost picture.
How is the gap to target calculated? Subtract the target yield from the actual yield. Here 92.5% minus a 95% target gives a -2.5 point gap, meaning the line fell 2.5 points short.

Last reviewed 2026-05-12.