How do you calculate net good footage per shift?

Multiply footage per cycle by available cycles to get gross footage, then multiply by uptime and first-pass yield, each as a decimal. For 3.5 ft/cycle over 600 cycles at 85% uptime and 97% yield, gross is 2,100 ft and net good is 1,731.45 ft.

What is the difference between uptime and first-pass yield here?

Uptime is the share of scheduled time the line actually runs, costing 315 ft in the example. First-pass yield is the share of running output that is good the first time, costing another 53.55 ft. One is a reliability loss, the other a quality loss.

What is a good first-pass yield for a converting line?

Mature flexible-packaging and roll-converting lines typically run 95 to 99% first-pass yield. The 97% default is solid; below 93% you usually have a recurring defect, splice, or web-handling issue worth a focused investigation.

Why use net good capacity instead of gross capacity for planning?

Gross capacity ignores stoppages and scrap, so planning against it guarantees missed targets. Net good capacity, 1,731.45 ft versus a 2,100 ft gross in the example, is what you can actually ship and should anchor commitments.

How do I increase net good footage?

Attack the larger loss first. In the example downtime costs 315 ft and yield costs 53.55 ft, so improving uptime, through faster changeovers or fewer jams, returns far more than chasing the last percent of yield.

Does this account for changeover time?

Indirectly, through uptime. If changeovers consume scheduled time, lower the uptime percentage to reflect them, or model fewer available cycles for that shift.

Industrial Packaging Materials Manufacturing calculator

Roll Diameter and Footage Capacity Calculator

Roll diameter capacity estimates how much sellable footage a winding or converting line actually produces in a shift after downtime and quality losses are stripped out. Production planners and line supervisors use it to set realistic shift targets, promise delivery dates, and see at a glance how much capacity is being eaten by stoppages versus defects. The gross number from cycles alone is a fantasy; the calculator multiplies it by uptime and first-pass yield so the figure matches what comes off the line as good rolls. Splitting the shortfall into downtime loss and yield loss also tells you which problem to attack first.

What this calculator does

Calculate the usable footage capacity of a roll based on output per revolution, available revolutions, line uptime, and first-pass yield so you can confirm production capacity before scheduling.
Use this when verifying that a rewinder, slitter, or converting line has enough capacity to meet a customer order, or when comparing shift output across different roll specs.
It computes net good footage per shift by taking gross cycle output and discounting it for line uptime and first-pass yield, while breaking out downtime and yield losses separately.

Formula used

Gross capacity = output per machine cycle x available cycles per shift
Net good capacity = gross capacity x (uptime / 100) x (first-pass yield / 100)

Inputs explained

Footage produced per machine cycle:
Available cycles per shift:
Expected line uptime:
First-pass yield:

How to use the result

Use it when planning shift output, committing to a ship date, or diagnosing whether lost capacity is a reliability or a quality problem.
Output per cycle is treated as constant, so runs with mixed roll widths, gauge changes, or speed ramps need to be modeled as separate cycles or averaged carefully.

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.
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 net good footage per shift? Multiply footage per cycle by available cycles to get gross footage, then multiply by uptime and first-pass yield, each as a decimal. For 3.5 ft/cycle over 600 cycles at 85% uptime and 97% yield, gross is 2,100 ft and net good is 1,731.45 ft.
What is the difference between uptime and first-pass yield here? Uptime is the share of scheduled time the line actually runs, costing 315 ft in the example. First-pass yield is the share of running output that is good the first time, costing another 53.55 ft. One is a reliability loss, the other a quality loss.
What is a good first-pass yield for a converting line? Mature flexible-packaging and roll-converting lines typically run 95 to 99% first-pass yield. The 97% default is solid; below 93% you usually have a recurring defect, splice, or web-handling issue worth a focused investigation.
Why use net good capacity instead of gross capacity for planning? Gross capacity ignores stoppages and scrap, so planning against it guarantees missed targets. Net good capacity, 1,731.45 ft versus a 2,100 ft gross in the example, is what you can actually ship and should anchor commitments.
How do I increase net good footage? Attack the larger loss first. In the example downtime costs 315 ft and yield costs 53.55 ft, so improving uptime, through faster changeovers or fewer jams, returns far more than chasing the last percent of yield.

Last reviewed 2026-05-12.