How do you calculate tooling amortization in parts?

Multiply good parts per cycle by planned cycles to get gross output, then multiply by availability and first-pass yield. With 2 parts/cycle over 500 cycles at 94% availability and 96% yield, you get 902.4 good parts.

Why discount tooling life by availability and yield?

Because gross capacity overstates reality. The 1,000 gross parts in the example shrink by 60 lost to downtime and 37.6 lost to scrap or rework, leaving 902.4 good parts to amortize the tool over.

How do I turn this into a per-part tooling cost?

Divide the tool's total cost by the good-parts figure. If a mold costs $90,000 and yields 902.4 good parts, the tooling amortization is about $99.73 per part.

What is first-pass yield in composite tooling?

The percentage of parts that come off the tool good the first time, with no rework or scrap. At 96% yield, 4 of every 100 molded parts need rework or are scrapped, which is why 37.6 parts drop out in the example.

Should I amortize over the full tool life or a shorter window?

Amortize over the cycles you're confident the tool will run for this program. Using full theoretical life can leave cost stranded if the program ends early; a conservative planned-cycles figure protects your quote.

Parts-per-cycle vs. cavities — are they the same?

Effectively yes for multi-cavity tools: a 2-up mold gives 2 good parts per cycle. Enter the number of usable parts each cycle produces, not the number of cavities if some routinely don't fill.

Composites, Fiberglass & Advanced Materials calculator

Tooling Amortization Calculator

Tooling amortization tells you how many good, sellable parts a composite mold or layup tool will actually produce over its planned life — the denominator you divide tool cost by to get a per-part tooling charge. Program managers and estimators in fiberglass and advanced composites use it because expensive Invar, epoxy-block and prepreg tooling only pays back if it survives enough cycles at acceptable availability and yield. This calculator starts from the theoretical parts-per-cycle capacity, then discounts for tool downtime and first-pass yield so your amortization base reflects reality, not the brochure.

What this calculator does

Estimate good part capacity over composite mold or tool cycles for amortization planning.
planning mold cost recovery across usable composite parts
It computes the good (sellable) parts a tool yields across its planned cycles after derating for availability and first-pass yield, and shows the parts lost to each.

Formula used

Gross tooling amortization = good parts possible per tool cycle × planned tool cycles for amortization
Good tooling amortization = gross output × tool availability during amortization period × tool-cycle first-pass yield

Inputs explained

Good parts per tool cycle:
Planned tool cycles over amortization period:
Tool availability over the period:
First-pass yield per cycle:

How to use the result

Use it when setting a per-part tooling amortization rate, comparing tooling options, or checking whether a tool's planned life supports your program volume.
It assumes availability and yield stay constant; in reality a tool degrades late in life and yield often dips, so treat the result as a planning baseline.

Current U.S. benchmarks

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 tooling amortization in parts? Multiply good parts per cycle by planned cycles to get gross output, then multiply by availability and first-pass yield. With 2 parts/cycle over 500 cycles at 94% availability and 96% yield, you get 902.4 good parts.
Why discount tooling life by availability and yield? Because gross capacity overstates reality. The 1,000 gross parts in the example shrink by 60 lost to downtime and 37.6 lost to scrap or rework, leaving 902.4 good parts to amortize the tool over.
How do I turn this into a per-part tooling cost? Divide the tool's total cost by the good-parts figure. If a mold costs $90,000 and yields 902.4 good parts, the tooling amortization is about $99.73 per part.
What is first-pass yield in composite tooling? The percentage of parts that come off the tool good the first time, with no rework or scrap. At 96% yield, 4 of every 100 molded parts need rework or are scrapped, which is why 37.6 parts drop out in the example.
Should I amortize over the full tool life or a shorter window? Amortize over the cycles you're confident the tool will run for this program. Using full theoretical life can leave cost stranded if the program ends early; a conservative planned-cycles figure protects your quote.

Last reviewed 2026-05-12.