How do you calculate line yield loss rate?

Divide lost containers by total formed containers and multiply by 100. With 2,600 lost out of 145,000 formed, the line yield loss rate is 1.79%.

What is a good line yield loss for glass containers?

Strong glass lines often target 1-2% total loss for established jobs, though it rises for lightweight or complex ware. The example's 1.79% sits inside a typical target band but is 0.29 points above the 1.5% goal set here.

What does a negative gap to target mean?

The gap is loss rate minus target, so a negative value means you are over the target loss. Here 1.79% minus 1.5% is -0.29 points, meaning the line is losing about 0.29 points more than planned.

Should I measure yield loss against formed or packed containers?

Use total formed containers as the denominator so the rate captures every loss from forming through packout. Measuring against packed ware would hide losses that occur before the pack station.

Line yield loss vs first-pass yield?

First-pass yield is usually a single station's pass rate; line yield loss is the whole-line loss against everything formed. A line can post good first-pass yields at each station yet still show meaningful total line loss.

How many containers is 0.29 points of loss worth?

On 145,000 formed containers, each point of loss is 1,450 containers, so the 0.29-point gap to target is roughly 425 extra lost containers for this batch — a concrete number to justify a corrective action.

Glass Container & Bottle Manufacturing calculator

Line yield loss Calculator

Line yield loss rate is the percentage of formed containers that are lost across the whole line — from gob through forming, the lehr, and cold-end rejects — relative to everything the IS machine made. Plant managers and process engineers track it as the headline quality-cost metric, because every lost container is melted-and-formed glass that consumed energy and capacity but never ships. It matters more than any single station's reject rate: a line can have clean checks everywhere and still bleed yield through swabbing losses, ware handling, and seasonal mold issues. By comparing the measured loss rate to a target, this tool tells you instantly whether the line is running tight or slipping, and by how many points.

What this calculator does

Calculate line yield loss for a glass bottle, jar, or container production line using lost containers, total formed containers, and target loss rate.
Use it when production teams need to quantify losses from hot-end rejects, cold-end inspection rejects, breakage, lehr losses, handling damage, packer rejects, or held ware.
It computes line yield loss rate as lost containers divided by total formed containers times 100, and the gap between that rate and your target.

Formula used

Line yield loss rate = lost containers on line ÷ total formed containers × 100
Line yield loss gap to target = line yield loss rate - target line loss rate

Inputs explained

Lost containers on the line:
Total formed containers:
Target line loss rate:

How to use the result

Use it for daily or shift yield reviews, campaign post-mortems, and to flag when a job is drifting away from its loss target.
It is a single aggregate number — a 1.79% loss could be one bad mold or broad small losses, so a negative gap to target does not by itself tell you where to act; pair it with station-level reject data.

Current U.S. benchmarks

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 line yield loss rate? Divide lost containers by total formed containers and multiply by 100. With 2,600 lost out of 145,000 formed, the line yield loss rate is 1.79%.
What is a good line yield loss for glass containers? Strong glass lines often target 1-2% total loss for established jobs, though it rises for lightweight or complex ware. The example's 1.79% sits inside a typical target band but is 0.29 points above the 1.5% goal set here.
What does a negative gap to target mean? The gap is loss rate minus target, so a negative value means you are over the target loss. Here 1.79% minus 1.5% is -0.29 points, meaning the line is losing about 0.29 points more than planned.
Should I measure yield loss against formed or packed containers? Use total formed containers as the denominator so the rate captures every loss from forming through packout. Measuring against packed ware would hide losses that occur before the pack station.
Line yield loss vs first-pass yield? First-pass yield is usually a single station's pass rate; line yield loss is the whole-line loss against everything formed. A line can post good first-pass yields at each station yet still show meaningful total line loss.

Last reviewed 2026-05-12.