How do you calculate fixture capacity?

Multiply accepted parts per cycle by available cycles for gross capacity, then multiply by availability and first-pass yield. With 6 parts/cycle, 160 cycles, 88% availability and 96% yield, gross is 960 and good capacity is about 811 parts.

What is the difference between gross and good fixture capacity?

Gross capacity (960 in the example) is the theoretical maximum if nothing went wrong. Good capacity (811) subtracts downtime loss and yield loss — here roughly 115 parts lost to downtime and 34 to yield.

What is a good first-pass yield through a fixture?

For a stable machining or assembly fixture, 95%+ is a reasonable target; the example uses 96%. Lower yields usually point to locating or clamping repeatability problems worth a fixture study.

How does availability affect fixture capacity?

Availability captures the share of planned cycles the fixture is actually usable, accounting for changeovers, jams and maintenance. At 88%, downtime alone removes about 115 parts from the 960 gross in the example.

Should I add a second fixture or pallet?

If good capacity falls short of demand and availability is already high, more cycles won't help — add a pallet to raise available cycles. If availability or yield is low, fix those first; you may recover capacity without buying anything.

Why are good parts less than parts-per-cycle times cycles?

Because no fixture runs every available cycle perfectly. Availability and yield each shave parts off, so 960 gross becomes 811 good once both losses are applied.

Fixture, Gauge & Workholding Management calculator

Fixture Capacity Calculator

Fixture Capacity estimates how many good parts a fixture or pallet can actually produce over a period, after losses from downtime and quality. It starts from gross capacity — parts per cycle times available cycles — then discounts for fixture availability and first-pass yield to give a realistic good-parts number. Manufacturing engineers and capacity planners use it to size fixtures, decide whether to buy a second pallet, and set honest throughput commitments. It is essentially an OEE-style view applied to the fixture instead of the whole machine, so you see exactly where parts are lost.

What this calculator does

Estimate good production output from fixtures, nests, pallets, or tombstones using parts per cycle, available cycles, fixture uptime, and first-pass yield.
Use it when checking whether fixture count and workholding layout can support daily or shift demand.
It computes the good (sellable) part output of a fixture by discounting gross capacity for availability and first-pass yield.

Formula used

Gross fixture capacity = accepted parts per fixture cycle × available fixture cycles
Good fixture capacity = gross capacity × fixture or pallet availability × first-pass yield through fixture

Inputs explained

Accepted parts per fixture cycle:
Available fixture cycles:
Fixture or pallet availability:
First-pass yield through fixture:

How to use the result

Use it when sizing fixturing for a new job, deciding whether to add pallets, or validating a throughput commitment.
It treats availability and yield as constant rates; a fixture whose yield degrades as it wears, or that shares a bottleneck machine, will not match this clean estimate.

Current U.S. benchmarks

The U.S. has 14,378 furniture and related products establishments employing about 355,594 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate fixture capacity? Multiply accepted parts per cycle by available cycles for gross capacity, then multiply by availability and first-pass yield. With 6 parts/cycle, 160 cycles, 88% availability and 96% yield, gross is 960 and good capacity is about 811 parts.
What is the difference between gross and good fixture capacity? Gross capacity (960 in the example) is the theoretical maximum if nothing went wrong. Good capacity (811) subtracts downtime loss and yield loss — here roughly 115 parts lost to downtime and 34 to yield.
What is a good first-pass yield through a fixture? For a stable machining or assembly fixture, 95%+ is a reasonable target; the example uses 96%. Lower yields usually point to locating or clamping repeatability problems worth a fixture study.
How does availability affect fixture capacity? Availability captures the share of planned cycles the fixture is actually usable, accounting for changeovers, jams and maintenance. At 88%, downtime alone removes about 115 parts from the 960 gross in the example.
Should I add a second fixture or pallet? If good capacity falls short of demand and availability is already high, more cycles won't help — add a pallet to raise available cycles. If availability or yield is low, fix those first; you may recover capacity without buying anything.

Last reviewed 2026-05-12.