How do I find which station is the bottleneck?

Look for work piling up in front of a station, and the longest average cycle once starved and blocked time is removed. That station sets line output: enter its ideal cycle and OEE here.

Should the bottleneck keep running through breaks?

Yes, if you can give it relief cover. Every minute the constraint runs adds output for the whole line; at the defaults, covering two 15-minute breaks adds 16 units a shift. Minutes gained at other stations add nothing.

Why enter the ideal cycle time rather than the measured one?

OEE already counts slow cycles and small stops as performance loss, so a measured cycle counts that loss twice and understates output. Enter the fastest cycle the station sustains, the one your OEE uses.

Do rejects after the bottleneck reduce its output?

Yes. A part scrapped downstream used bottleneck time you cannot get back. Count downstream rejects in the bottleneck's OEE quality factor, and inspect before the constraint so it works only on good parts.

Lean Manufacturing & Operations calculator

Bottleneck Output Capacity Calculator

Find how many good units a shift your line's constraint can release, and whether that covers demand. You need net available time, the bottleneck's ideal cycle time and OEE, and shift demand.

What this calculator does

Good units a shift your bottleneck can release at its measured OEE, and whether that covers shift demand.

Formula used

Output at 100% OEE = net available time ÷ bottleneck ideal cycle time
Bottleneck output = output at 100% OEE × bottleneck OEE % ÷ 100
Load = shift demand ÷ bottleneck output × 100; surplus = bottleneck output − shift demand
Longest cycle = net available time × OEE % ÷ 100 ÷ demand; OEE needed = demand × cycle ÷ net available time × 100
Extra bottleneck time = MAX(0, demand × cycle ÷ (OEE % ÷ 100) − net available time)

Inputs explained

Net Available Time: Shift minutes minus the breaks and meetings the bottleneck stops for.
Bottleneck Ideal Cycle Time: Fastest sustained cycle of the constraint station, per unit.
Bottleneck OEE: Measured OEE of the constraint station over recent comparable shifts.
Shift Demand: Good units the schedule needs from the line each shift.

How to use the result

Best suited to committing a shift quantity to the planner, pricing a kaizen on the constraint station, deciding on relief cover through breaks.
A starved or blocked bottleneck makes less: keep a buffer in front of it and spare capacity after it. One product at one ideal cycle; for a mix, use a demand-weighted cycle or run each product separately.

Current U.S. benchmarks

U.S. manufacturing runs at 75.7% of capacity (Federal Reserve, Aug 2026). New factory orders are up 8.5% year over year (Census).

Common questions

How do I find which station is the bottleneck? Look for work piling up in front of a station, and the longest average cycle once starved and blocked time is removed. That station sets line output: enter its ideal cycle and OEE here.
Should the bottleneck keep running through breaks? Yes, if you can give it relief cover. Every minute the constraint runs adds output for the whole line; at the defaults, covering two 15-minute breaks adds 16 units a shift. Minutes gained at other stations add nothing.
Why enter the ideal cycle time rather than the measured one? OEE already counts slow cycles and small stops as performance loss, so a measured cycle counts that loss twice and understates output. Enter the fastest cycle the station sustains, the one your OEE uses.
Do rejects after the bottleneck reduce its output? Yes. A part scrapped downstream used bottleneck time you cannot get back. Count downstream rejects in the bottleneck's OEE quality factor, and inspect before the constraint so it works only on good parts.

Last reviewed 2026-10-01.