How do you calculate case erector capacity?

Multiply the rated forming rate by available run time for gross cases, then multiply by uptime and clean-erect quality. At 4 cases/min over 480 min, 90% uptime, and 97% quality: 1,920 gross x 0.90 x 0.97 = 1,676 good erected cases.

Why does my case erector form fewer good cases than its rated speed?

Two reasons: it does not run every available minute (blank misfeeds, glue or tape faults, magazine reloads) and not every case forms square. In the example those losses are 192 cases from downtime and about 52 from bad erects.

What is a good clean-erect quality rate for a case erector?

A well-tuned erector with consistent corrugate hits 98 to 99% clean-erect first-pass. The 97% here is workable but suggests room to improve blank quality, vacuum pickup, or square-up timing before cases reach the packer.

Will my case erector keep up with the case packer?

Compare good erected cases against the packer's demand. If the packer needs 1,700 cases a shift and the erector only delivers 1,676 good ones, you will starve the packer. Raise erector uptime or add a small accumulation buffer.

Is downtime or reject loss the bigger limiter on a case erector?

Typically downtime. In the example, 192 cases are lost to downtime versus about 52 to bad erects, so fixing blank misfeeds and tape or glue faults returns far more than chasing the last bit of square-up quality.

What is the difference between gross and good erected cases?

Gross erected cases, 1,920 here, is the count if the erector never stopped and every case formed square. Good erected cases, 1,676, is what actually moves downstream after downtime and reject losses.

Packaging Automation & End-of-Line Systems calculator

Case Erector Capacity Calculator

Case Erector Capacity estimates how many usable, square cases an automatic case erector actually forms in a shift, well below its nameplate rate. Packaging engineers and line leads use it to confirm the erector can feed the downstream packer and palletizer without starving them. The metric matters because the erector sits at the front of end of line, so every case it fails to form, or forms crooked, ripples through the whole packaging zone. By splitting gross output into downtime and reject losses, it shows whether blank misfeeds or out-of-square cases are the real constraint.

What this calculator does

Estimate how many erected and sealed cases a case erector can supply per shift from its forming rate, run time, uptime, and clean-erect quality.
Use it when you need to confirm a case erector can feed the case packer without starving the end of line.
It computes good erected cases by derating the rated forming rate over run time by uptime and clean-erect quality, and breaks out downtime and reject losses.

Formula used

Gross erected cases = rated case forming rate × available run time
Good erected cases = gross erected cases × expected case erector uptime × clean-erect quality

Inputs explained

Rated case forming rate:
Available case erecting run time:
Expected case erector uptime:
Clean-erect first-pass quality:

How to use the result

Use it to confirm the erector can supply the case packer, to set shift targets, or to find whether downtime or bad erects limit output.
It applies single average rates and percentages, so it will not model micro-stops, blank-magazine reloads, or how reject rates rise with corrugate variability or humidity.

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 case erector capacity? Multiply the rated forming rate by available run time for gross cases, then multiply by uptime and clean-erect quality. At 4 cases/min over 480 min, 90% uptime, and 97% quality: 1,920 gross x 0.90 x 0.97 = 1,676 good erected cases.
Why does my case erector form fewer good cases than its rated speed? Two reasons: it does not run every available minute (blank misfeeds, glue or tape faults, magazine reloads) and not every case forms square. In the example those losses are 192 cases from downtime and about 52 from bad erects.
What is a good clean-erect quality rate for a case erector? A well-tuned erector with consistent corrugate hits 98 to 99% clean-erect first-pass. The 97% here is workable but suggests room to improve blank quality, vacuum pickup, or square-up timing before cases reach the packer.
Will my case erector keep up with the case packer? Compare good erected cases against the packer's demand. If the packer needs 1,700 cases a shift and the erector only delivers 1,676 good ones, you will starve the packer. Raise erector uptime or add a small accumulation buffer.
Is downtime or reject loss the bigger limiter on a case erector? Typically downtime. In the example, 192 cases are lost to downtime versus about 52 to bad erects, so fixing blank misfeeds and tape or glue faults returns far more than chasing the last bit of square-up quality.

Last reviewed 2026-05-12.