How do you calculate die utilization in pultrusion?

Take the idle or unassigned dies over your total die inventory to see the idle share, then compare against your target. In the example, 8 of 250 dies idle gives a 3.2% figure, with a 91.8-point gap to a 95% target.

What is a good die utilization rate?

Most shops aim to keep the large majority of their die set active across a planning period; targets of 90% or higher are common for mature product lines. Idle dies represent stranded tooling capital.

Why track idle dies at all?

Each pultrusion die can cost thousands to tens of thousands of dollars. Idle dies tie up capital and rack space and often flag a profile that has lost its customer or fallen out of the schedule.

What does the gap to target mean?

It is the distance between your measured figure and the utilization target you set. The 91.8-point gap in the example reflects comparing a 3.2% idle-share reading against a 95% target — set the inputs to match how you define utilization.

Should I retire idle dies?

Not automatically. Some dies serve seasonal or low-volume customers worth keeping. Weigh storage and capital cost against the revenue and relationship the profile supports before scrapping tooling.

How is die utilization different from line utilization?

Line utilization measures machine uptime; die utilization measures how much of your tooling asset base is in play. You can run a line hard while most of your die inventory sits idle.

Pultrusion & Continuous Composite Profiles calculator

Die Utilization Calculator

Die Utilization shows what share of your pultrusion tooling inventory is actively earning versus sitting idle on the rack. Pultrusion dies are expensive, precision-machined, hard-chromed tools, and a shop's die set often represents a major capital investment, so plant managers and tooling engineers care whether that capital is working. A rack full of idle dies ties up cash and signals either over-tooling, lost customers for those profiles, or scheduling that leaves capacity stranded. Tracking utilization against a target guides tooling purchases, retirement decisions, and where to chase new business to fill open die capacity.

What this calculator does

Die Utilization shows what share of your pultrusion tooling inventory is actively earning versus sitting idle on the rack.
Use it when die utilization in pultrusion and continuous composite profiles needs a clean rate and gap-to-target you can put on a tier board.
It computes the share of your die inventory that is idle and the gap between the resulting utilization and your target rate.

Formula used

Die Utilization rate = affected amount ÷ total amount
Gap to target = target rate - calculated rate

Inputs explained

Dies idle or unassigned:
Total dies in tooling inventory:
Target die utilization rate:

How to use the result

Use it during tooling reviews, capital planning, or when deciding whether to build new dies versus better schedule existing ones.
It counts dies as simply active or idle; it does not weight by die value, throughput, or the margin each profile earns, so a few high-value idle dies can matter more than the raw percent suggests.

Current U.S. benchmarks

As of May 2026, U.S. manufacturing runs at 75.6% of capacity (Federal Reserve via FRED), up 0.2 points from a year earlier. Enter your own plant's utilization; the national figure is a reference point for how loaded the industry is.
The producer price index for plastic resins and materials stands at 319.371 (BLS, May 2026), up 19.5% from a year earlier. Quotes priced off last quarter's material cost miss this move.

Common questions

How do you calculate die utilization in pultrusion? Take the idle or unassigned dies over your total die inventory to see the idle share, then compare against your target. In the example, 8 of 250 dies idle gives a 3.2% figure, with a 91.8-point gap to a 95% target.
What is a good die utilization rate? Most shops aim to keep the large majority of their die set active across a planning period; targets of 90% or higher are common for mature product lines. Idle dies represent stranded tooling capital.
Why track idle dies at all? Each pultrusion die can cost thousands to tens of thousands of dollars. Idle dies tie up capital and rack space and often flag a profile that has lost its customer or fallen out of the schedule.
What does the gap to target mean? It is the distance between your measured figure and the utilization target you set. The 91.8-point gap in the example reflects comparing a 3.2% idle-share reading against a 95% target — set the inputs to match how you define utilization.
Should I retire idle dies? Not automatically. Some dies serve seasonal or low-volume customers worth keeping. Weigh storage and capital cost against the revenue and relationship the profile supports before scrapping tooling.

Last reviewed 2026-05-12.