How do you calculate coil or spool capacity for hose assemblies?

Multiply assemblies cut per pass by usable passes to get gross capacity, then multiply by uptime and first-pass yield. With 50 assemblies/pass, 18 passes, 90% uptime and 96% yield, gross is 900 and good capacity is 777.6 assemblies.

Why is good capacity lower than the gross cut count?

Gross capacity (900 here) assumes the crimper never stops and every assembly passes leak test. Downtime removes 90 assemblies and first-pass rejects remove another 32.4, leaving 777.6 good assemblies.

What is a good first-pass yield for crimped hose assemblies?

Established cut-and-crimp lines on standardized fittings typically run 95-98% first-pass yield. The 96% default sits in that band; falling below 92% usually points to crimp diameter drift or contaminated seal areas.

How do I get more good assemblies per spool?

Either raise usable passes by reducing offcut waste at coil ends, lift crimper uptime above 90%, or improve first-pass yield. Each percentage point of uptime on this spool is worth about 7.8 good assemblies.

Gross capacity vs good capacity, which do I quote from?

Always commit from good capacity. Quoting 900 when the spool truly yields 777.6 leaves you about 122 assemblies short and forces an unplanned reorder.

Hose, Tubing & Fluid Conveyance Products calculator

Coil/Spool Capacity Calculator

Coil/Spool Capacity tells a hose fabrication shop how many sellable, leak-tight assemblies it can realistically pull off one coil or spool of bulk hose before that material runs out. It separates the theoretical cut count from the assemblies actually delivered after crimper downtime and rejects at first leak test. Production planners and buyers use it to convert a spool count into committed delivery dates and to decide how much bulk hose to order against a release. On a real cut-and-crimp line the gap between gross and good capacity is where margin quietly disappears, so this number drives both scheduling and material requisition.

What this calculator does

Estimate good hose assemblies or cut pieces producible from a coil or spool, accounting for equipment uptime and first-pass yield.
Use it when planning production from a specific coil or spool to confirm whether available material covers the order.
It computes the number of good hose assemblies obtainable from a single coil or spool after applying equipment uptime and first-pass yield to the gross cut count.

Formula used

Gross coil capacity = assemblies per pass x usable passes
Good coil capacity = gross capacity x equipment uptime x first-pass yield

Inputs explained

Assemblies cut per coil or spool pass:
Usable passes per coil or spool:
Crimper and cut-line uptime:
First-pass assembly yield:

How to use the result

Use it when sizing bulk hose purchases against an order release or converting available spools into a committed assembly schedule.
It assumes a fixed cut length per pass and steady yield; mixed assembly lengths off the same spool or a fitting changeover mid-coil will skew the gross pass count.

Current U.S. benchmarks

The U.S. has 11,391 plastics and rubber products establishments employing about 815,988 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate coil or spool capacity for hose assemblies? Multiply assemblies cut per pass by usable passes to get gross capacity, then multiply by uptime and first-pass yield. With 50 assemblies/pass, 18 passes, 90% uptime and 96% yield, gross is 900 and good capacity is 777.6 assemblies.
Why is good capacity lower than the gross cut count? Gross capacity (900 here) assumes the crimper never stops and every assembly passes leak test. Downtime removes 90 assemblies and first-pass rejects remove another 32.4, leaving 777.6 good assemblies.
What is a good first-pass yield for crimped hose assemblies? Established cut-and-crimp lines on standardized fittings typically run 95-98% first-pass yield. The 96% default sits in that band; falling below 92% usually points to crimp diameter drift or contaminated seal areas.
How do I get more good assemblies per spool? Either raise usable passes by reducing offcut waste at coil ends, lift crimper uptime above 90%, or improve first-pass yield. Each percentage point of uptime on this spool is worth about 7.8 good assemblies.
Gross capacity vs good capacity, which do I quote from? Always commit from good capacity. Quoting 900 when the spool truly yields 777.6 leaves you about 122 assemblies short and forces an unplanned reorder.

Last reviewed 2026-05-12.