How do you calculate autoclave utilization?

Divide productive cure hours by available hours and multiply by 100. With 116 cure hours out of 160 available you get 72.5% utilization.

What is a good autoclave utilization rate?

Well-scheduled composites shops target 80% or higher on time-utilization. The example sits at 72.5%, which is 7.5 points short of an 80% target and signals recoverable idle time.

What counts as available autoclave hours?

Scheduled hours the vessel could run, after planned maintenance windows. Whether you use a 24/7 or single-shift basis, keep it consistent so the percentage is comparable over time.

Why is my autoclave utilization low?

Common causes are waiting for enough parts to fill a load, single-shift operation on a 24-hour-capable asset, long load and unload changeovers, and cure recipes that can't be co-cured together.

Time utilization vs load utilization: what's the difference?

This calculator measures time, how many hours the autoclave runs. Load utilization measures how full each cycle is. You can hit 80% time and still waste capacity with half-empty loads.

How do I close the gap to target?

Batch compatible cure cycles, add off-shift cure runs, and stage parts so a load is ready when the door opens. Closing a 7.5-point gap on a 160-hour week recovers 12 productive hours.

Composites, Fiberglass & Advanced Materials calculator

Autoclave Utilization Calculator

Autoclave Utilization measures how much of an autoclave's available time is actually spent running productive cure cycles versus sitting idle, loading, or down for maintenance. Composites operations managers watch this number closely because an autoclave is the most capital-intensive and energy-hungry asset on the floor; every idle hour on a multi-million-dollar pressure vessel is unrecoverable margin. The calculator divides productive cure hours by available hours and then shows the gap to your target, so you immediately see whether scheduling, cure batching, or part flow is the constraint. For aerospace and high-performance composite shops, a few points of utilization can decide whether you need a second autoclave or not.

What this calculator does

Calculate autoclave utilization for composite cure assets.
tracking autoclave asset utilization
It computes the percentage of available autoclave hours spent on productive cure cycles and the point gap between that and your target.

Formula used

Autoclave Utilization = productive autoclave cure hours ÷ available autoclave hours × 100
Gap to target = Autoclave Utilization - target autoclave utilization

Inputs explained

Productive autoclave cure hours:
Available autoclave hours:
Target autoclave utilization:

How to use the result

Use it for weekly or monthly capacity reviews, to justify capital before buying a second vessel, or to quantify the payback of better cure batching.
Hours utilization treats a half-empty autoclave the same as a full load; it does not measure volumetric or shelf packing, so high time-utilization can still hide poor floor-area use inside the vessel.

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.
Steel mill PPI stands at 348.53 (BLS, May 2026), up 6.7% from a year earlier. New factory orders are up 2.3% year over year (Census).

Common questions

How do you calculate autoclave utilization? Divide productive cure hours by available hours and multiply by 100. With 116 cure hours out of 160 available you get 72.5% utilization.
What is a good autoclave utilization rate? Well-scheduled composites shops target 80% or higher on time-utilization. The example sits at 72.5%, which is 7.5 points short of an 80% target and signals recoverable idle time.
What counts as available autoclave hours? Scheduled hours the vessel could run, after planned maintenance windows. Whether you use a 24/7 or single-shift basis, keep it consistent so the percentage is comparable over time.
Why is my autoclave utilization low? Common causes are waiting for enough parts to fill a load, single-shift operation on a 24-hour-capable asset, long load and unload changeovers, and cure recipes that can't be co-cured together.
Time utilization vs load utilization: what's the difference? This calculator measures time, how many hours the autoclave runs. Load utilization measures how full each cycle is. You can hit 80% time and still waste capacity with half-empty loads.

Last reviewed 2026-05-12.