How many parallel stations should I install?

Enough that good capacity covers required output with one station down. Start from the one-station-down row: if it already clears demand, the installed count is enough for that level of redundancy.

Does one station down mean one station broken?

It is the planned test: any single station unavailable for any reason, planned or not. Maintenance, changeover or a breakdown all remove one station's cycles from the hour.

What uptime figure belongs here?

The measured run time of the station group divided by its available time, from downtime logs. For redundancy planning, exclude stops that affected only a station already covered by the one-down case.

Why does yield reduce capacity twice in the loss rows?

It does not; each loss is a separate slice of gross capacity. Downtime removes time before yield applies, so the yield loss is calculated on the running hours only.

Conveyors calculator

Parallel Station Capacity Calculator

Size a bank of parallel stations from the cycles one station can deliver and see whether the group covers demand with one station down. The redundancy case is what the duplicate stations were bought for.

What this calculator does

Good hourly capacity of parallel stations after losses, with the one-station-down case and the demand test.

Formula used

Gross parallel capacity = parallel stations installed × available cycles per station-hour
Good parallel capacity = gross capacity × uptime % ÷ 100 × good output yield % ÷ 100
Capacity lost to downtime = gross capacity × (100 − uptime %) ÷ 100
Capacity lost to yield = gross capacity × uptime % ÷ 100 × (100 − yield %) ÷ 100
Capacity with one station down = (stations − 1) × cycles × uptime × yield; capacity gap = required output − good capacity

Inputs explained

Parallel Stations Installed: Duplicate stations or cells running the same operation in parallel.
Available Cycles per Station-Hour: Cycles one station can complete in a running hour.
Parallel Station Uptime: Run time ÷ available time for the station group.
Good Output Yield: Good units ÷ units started through the station group.
Required Output: Good units per hour demand or the next process needs.

How to use the result

Best suited to sizing redundant test or pack stations, checking output before dropping a shift, planning maintenance without stopping the group.
Two stations down at once is not modeled; a common cause outage would take the whole group. Demand is a steady hourly rate, with no ramp or seasonal pattern inside the window.

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

How many parallel stations should I install? Enough that good capacity covers required output with one station down. Start from the one-station-down row: if it already clears demand, the installed count is enough for that level of redundancy.
Does one station down mean one station broken? It is the planned test: any single station unavailable for any reason, planned or not. Maintenance, changeover or a breakdown all remove one station's cycles from the hour.
What uptime figure belongs here? The measured run time of the station group divided by its available time, from downtime logs. For redundancy planning, exclude stops that affected only a station already covered by the one-down case.
Why does yield reduce capacity twice in the loss rows? It does not; each loss is a separate slice of gross capacity. Downtime removes time before yield applies, so the yield loss is calculated on the running hours only.

Last reviewed 2026-10-01.