Plastics Extrusion - Pipe, Film & Profile worked example

Film Gauge Yield at 69% target gauge yield: a worked example

Suppose target gauge yield falls to 69%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Compare acceptable film or sheet footage against total footage to estimate gauge yield after rejects, trim, and off-spec rolls.

The inputs for this scenario

Accepted in-gauge footage: 47,000 ft (held at the documented default)
Total footage produced: 50,000 ft (held at the documented default)
Target gauge yield: 69 % (the input this scenario stresses; the baseline uses 96)

Working through the calculation

The calculation starts from the formula this tool documents: Film Gauge Yield = accepted in-gauge footage ÷ total footage produced.
Film gauge yield works out to 94 % at these inputs, and this is the headline figure for the scenario.
Gauge yield gap works out to -25 points at these inputs.
Accepted footage works out to 47,000 count at these inputs.
Total footage produced works out to 50,000 count at these inputs.

How this compares with the baseline

Against the tool's baseline example, where target gauge yield sits at 96% and the headline result is 94 %, this scenario lands almost exactly on the baseline at 94 %.
It divides accepted in-gauge footage by total footage produced to give the gauge yield percent, then subtracts that from your target to show the gap in points. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

Film gauge yield: 94 % (headline result)
Gauge yield gap: -25 points
Accepted footage: 47,000 count
Total footage produced: 50,000 count

Run it with your numbers

To rerun this with your own numbers, open the live Film Gauge Yield calculator, set target gauge yield to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.