Packaging Automation & End-of-Line Systems calculator
End-of-Line Bottleneck Calculator
The end-of-line bottleneck cost quantifies how much money a constrained palletizer, case sealer, or shrink wrapper actually drains from a run once you account for cases that are truly lost rather than just temporarily backed up. Packaging engineers and plant managers use it to put a dollar figure on a chronic choke point so a capital request for a faster machine or a second lane can be justified. It matters because a line that throttles 100 cases looks alarming, but if 80% of that output recovers later in the shift, the real loss is far smaller than the raw delay implies. Pairing the variable loss with the fixed expedite and overtime you burn chasing the schedule gives the true cost of living with the constraint.
What this calculator does
- Estimate the cost of an end of line bottleneck from cases delayed, the value per delayed case, the share truly lost, and any fixed expedite cost.
- Use it when an end of line constraint is throttling shipments and you need to size the cost before approving a fix.
- It computes the total cost of an end-of-line bottleneck by multiplying delayed cases, case value, and the share genuinely lost, then adding fixed expedite and overtime spend.
Formula used
- Variable bottleneck cost = cases delayed by the bottleneck × value per delayed case × share of output truly lost
- Total bottleneck cost = variable bottleneck cost + fixed expedite and overtime cost
Inputs explained
- Cases delayed by the bottleneck:
- Value per delayed case:
- Share of output truly lost:
- Fixed expedite and overtime cost:
How to use the result
- Use it when building a business case for end-of-line capacity, comparing the cost of a constraint against the price of fixing it, or ranking which line choke point to attack first.
- It treats lost output as a flat fraction of delayed cases; in reality recovery depends on downstream buffer, remaining shift time, and whether the order ships that day, so validate the loss share against actual fulfillment data.
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 end-of-line bottleneck cost? Multiply cases delayed by the value per case and by the share of output truly lost to get variable cost, then add fixed expedite and overtime. With 100 cases delayed at $45, an 80% loss share, and $250 fixed, that is $3,600 variable plus $250 = $3,850 total.
- Why isn't the bottleneck cost just delayed cases times case value? Because not every delayed case is a lost case. Much of the backed-up output catches up later in the shift or is absorbed by downstream buffer. The 'share truly lost' factor (80% here) strips out the cases you recover so you do not overstate the damage.
- What is the bottleneck cost per case? It is total cost divided by cases delayed. In the worked example, $3,850 across 100 delayed cases is $38.50 per delayed case, which is a useful single number for comparing one constraint against another.
- What counts as a good bottleneck cost? There is no universal target; the test is whether the annualized cost exceeds the payback on a fix. If a $3,850-per-event bottleneck recurs daily, that is roughly $1M a year, which easily justifies a faster case packer or a parallel lane.
- Should expedite freight be in the fixed cost field? Yes. Any cost you incur specifically to recover from the bottleneck that does not scale with case count, such as overtime crews, premium freight, or rush changeovers, belongs in the fixed expedite and overtime field of $250.
Last reviewed 2026-05-12.