How do you calculate fixture amortization per part?

Divide the fixture investment by the expected lifetime quantity, then multiply by a utilization or scrap factor. A $4,800 fixture over 6,000 parts at a factor of 1.0 amortizes to $0.80 per part.

What quantity should I amortize a fixture over?

Use the realistic committed or forecast volume for the fixture's life, not best-case. If a customer commits to 6,000 parts, amortize over 6,000 for $0.80 each; amortizing over a hopeful 20,000 understates cost and risks never recovering the build.

What is the scrap or utilization factor for?

It adjusts the raw ratio for parts that the fixture handles but you cannot sell — scrap, test pieces, or shared-use derating. A factor of 1.0 means no adjustment; 1.1 would raise the $0.80 to $0.88 to cover a 10 percent loss.

Should fixture cost go into the machine rate instead?

No — a dedicated fixture serves one part number, so it should be amortized to that part, not buried in a shop rate that all jobs pay. Generic vises and chucks belong in the machine rate; dedicated workholding belongs here.

How does fixture amortization affect break-even on a custom fixture?

At $0.80/part the fixture must produce 6,000 parts to recover $4,800. If a vise setup costs $1.50/part more in labor, the fixture pays back well before that — but on a 200-part job, $24 per part of amortization makes the custom fixture a clear loss.

Fixture amortization vs tooling cost — are they the same?

No. Fixture amortization recovers durable workholding over its life. Tooling/wear cost covers consumable cutting edges burned per part. A fixture is built once and reused; inserts are consumed continuously.

CNC Machining calculator

Fixture Amortization Calculator

Fixture amortization spreads the one-time cost of designing and building dedicated workholding — a soft-jaw set, a tombstone fixture, a vacuum plate — across the parts it will produce, turning a lump-sum tooling investment into a clean per-part number. Estimators use it to recover fixture cost fairly in a quote, and engineers use it to decide whether a custom fixture pays for itself versus running in a vise. The math is simple, but the judgment in choosing the right expected quantity is where quotes win or lose money. Amortize over too few parts and you price yourself out; over too many and you never recover the build.

What this calculator does

Allocate fixture, soft jaw, pallet, vise, or workholding investment across the expected number of machined parts.
allocating workholding cost to a CNC quote, fixture ROI review, or repeat-production program
It divides the fixture investment by the expected production quantity and applies a utilization or scrap factor to give a per-part fixture cost.

Formula used

Fixture Amortization = fixture or workholding investment ÷ expected production quantity × utilization or scrap factor
Keep numerator and denominator on the same job, setup, tool, or production basis.

Inputs explained

Fixture or workholding investment:
Expected production quantity over fixture life:
Utilization or scrap adjustment factor:

How to use the result

Use it when quoting a job that needs dedicated workholding, or deciding whether a custom fixture beats a standard setup.
It assumes the full expected quantity actually runs — if the program is cancelled early or volume falls short, the real per-part cost is higher than quoted.

Current U.S. benchmarks

The producer price index for steel mill products stands at 348.53 (BLS, May 2026), up 6.7% from a year earlier. Quotes priced off last quarter's material cost miss this move.
The U.S. has 17,154 machine shops establishments employing about 223,303 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate fixture amortization per part? Divide the fixture investment by the expected lifetime quantity, then multiply by a utilization or scrap factor. A $4,800 fixture over 6,000 parts at a factor of 1.0 amortizes to $0.80 per part.
What quantity should I amortize a fixture over? Use the realistic committed or forecast volume for the fixture's life, not best-case. If a customer commits to 6,000 parts, amortize over 6,000 for $0.80 each; amortizing over a hopeful 20,000 understates cost and risks never recovering the build.
What is the scrap or utilization factor for? It adjusts the raw ratio for parts that the fixture handles but you cannot sell — scrap, test pieces, or shared-use derating. A factor of 1.0 means no adjustment; 1.1 would raise the $0.80 to $0.88 to cover a 10 percent loss.
Should fixture cost go into the machine rate instead? No — a dedicated fixture serves one part number, so it should be amortized to that part, not buried in a shop rate that all jobs pay. Generic vises and chucks belong in the machine rate; dedicated workholding belongs here.
How does fixture amortization affect break-even on a custom fixture? At $0.80/part the fixture must produce 6,000 parts to recover $4,800. If a vise setup costs $1.50/part more in labor, the fixture pays back well before that — but on a 200-part job, $24 per part of amortization makes the custom fixture a clear loss.

Last reviewed 2026-05-12.