Why do the current and limited outputs match at zero improvement?

Because the improvement input is zero, so the formula multiplies by 1. The two rows separate as soon as you enter the share of the bottleneck cycle you expect to remove.

How do I identify the bottleneck station?

Time every station or read PLC cycle counters and take the longest repeatable cycle. Watch the line for an hour: the station with product waiting in front of it is usually the constraint.

How do I size the improvement to enter?

From the fixture, staffing or work-content change you are considering. A 20 percent gain on 42-second cycles lifts 85.7 units an hour to 102.9, so enter 20 and compare the after output with demand.

Can total line output exceed demand without a bottleneck fix?

Only if demand falls or the line sells more, because throughput is capped by the slowest cycle. Adding speed at the constraint is what lifts the ceiling for the whole line.

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Line Bottleneck Finder Calculator

Find the output a line can make from its slowest station, then test it against demand. The page shows today's output, the output after a bottleneck improvement and the cycle demand needs.

What this calculator does

The output a bottleneck station limits the line to, the gain from improving it, and the cycle demand requires.

Formula used

Current output = available production seconds per hour ÷ slowest station cycle time
Bottleneck-limited output = current output × (1 + bottleneck improvement % ÷ 100)
Improvement gain = bottleneck-limited output − current output
Required cycle to meet demand = available production seconds per hour ÷ demand

Inputs explained

Available Production Seconds per Hour: Seconds the line is scheduled to run each hour.
Slowest Station Cycle Time: Measured cycle of the bottleneck station, slow cycles included.
Bottleneck Improvement: Expected percent increase in bottleneck output after the fix.
Demand: Good units per hour the schedule or next process needs.

How to use the result

Best suited to deciding where to spend kaizen time, quote check before taking more orders, sizing a bottleneck fixture change.
An average hour at one product mix; a change in mix can move the bottleneck to another station. The improvement applies to the bottleneck only. Improving a non-bottleneck station adds nothing.

Current U.S. benchmarks

The U.S. has 21,668 machinery manufacturing establishments employing about 1,086,146 workers (Census County Business Patterns, 2023).

Common questions

Why do the current and limited outputs match at zero improvement? Because the improvement input is zero, so the formula multiplies by 1. The two rows separate as soon as you enter the share of the bottleneck cycle you expect to remove.
How do I identify the bottleneck station? Time every station or read PLC cycle counters and take the longest repeatable cycle. Watch the line for an hour: the station with product waiting in front of it is usually the constraint.
How do I size the improvement to enter? From the fixture, staffing or work-content change you are considering. A 20 percent gain on 42-second cycles lifts 85.7 units an hour to 102.9, so enter 20 and compare the after output with demand.
Can total line output exceed demand without a bottleneck fix? Only if demand falls or the line sells more, because throughput is capped by the slowest cycle. Adding speed at the constraint is what lifts the ceiling for the whole line.

Last reviewed 2026-10-01.