How do you calculate machining scrap cost?

Multiply scrapped parts by cost per part, then add containment and investigation cost and the rework, remake, and disposal burden. In the example, 14 x $86 + $350 + $420 = $1,974.

What is the cost per scrapped part in this example?

Total scrap cost of $1,974 divided by 14 scrapped parts gives $141 per part - well above the $86 raw part value because the fixed containment and rework adders spread across the batch.

Why is cost per scrapped part higher than the part's value?

Because the part value is only one piece. The $770 in containment, rework, and disposal adders push the loaded cost from $86 up to $141 per part once spread across the 14 scrapped units.

Should I include investigation time in scrap cost?

Yes. Containment, sorting, and root-cause investigation are real labor costs triggered by the scrap. Leaving them out understates the event - here they account for $350 of the $1,974 total.

Scrap cost vs rework cost - which is worse?

Scrap is usually worse per part because the part is lost entirely plus disposal cost, while rework recovers the part for added labor. This tool lets you fold a rework burden into the total so you can compare both.

How do I lower machining scrap cost?

Attack the biggest lever. On high-value parts, reducing the scrapped-part count matters most; on low-value parts, trimming the fixed containment and investigation burden per event often saves more than the metal.

CNC Machining calculator

Scrap From Machining Calculator

Machining scrap cost is the full financial hit when CNC parts are rejected, not just the value of the metal and machine time in the part itself. It bundles the part value with the containment and investigation effort and the rework, remake, and disposal burden that follow a reject. Quality engineers, CNC shop owners, and program managers use it to size the real cost of a scrap event and to justify fixturing, tooling, or inspection changes. The reason it matters is that a small scrap count on high-value machined parts can dwarf the savings from a faster cycle time.

What this calculator does

Estimate the cost of scrapped machined parts from scrap quantity, part cost, fixed investigation cost, and rework or disposition burden.
estimating the financial impact of CNC scrap for a job, shift, part family, or corrective action
It sums the value of scrapped machined parts plus containment, investigation, rework, remake, and disposal costs into one total, then divides by part count for a true per-part scrap cost.

Formula used

Total machining scrap cost = scrapped machined parts × cost per scrapped part + containment and investigation cost + rework, remake, and disposal burden
Scrap cost per scrapped part = total machining scrap cost ÷ scrapped machined parts

Inputs explained

scrapped machined parts: Count parts that cannot be shipped or recovered within specification for the scope being reviewed.
cost per scrapped part: Include material, machining, tooling, outside processing, and value added before the part was scrapped.
containment and investigation cost: Include inspection sort, engineering review, customer containment, or corrective-action cost.
rework, remake, and disposal burden: Include remake setup, expedited production, disposal, handling, or administrative cost tied to the scrap event.

How to use the result

Use it after a scrap event or at month-end to put a dollar figure on rejected CNC work and to compare the cost of scrap against the cost of prevention.
It uses a single average cost per scrapped part and lump-sum adders; it does not separate material from machine-hour cost or account for schedule slip and customer penalties beyond the burdens you enter.

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 machining scrap cost? Multiply scrapped parts by cost per part, then add containment and investigation cost and the rework, remake, and disposal burden. In the example, 14 x $86 + $350 + $420 = $1,974.
What is the cost per scrapped part in this example? Total scrap cost of $1,974 divided by 14 scrapped parts gives $141 per part - well above the $86 raw part value because the fixed containment and rework adders spread across the batch.
Why is cost per scrapped part higher than the part's value? Because the part value is only one piece. The $770 in containment, rework, and disposal adders push the loaded cost from $86 up to $141 per part once spread across the 14 scrapped units.
Should I include investigation time in scrap cost? Yes. Containment, sorting, and root-cause investigation are real labor costs triggered by the scrap. Leaving them out understates the event - here they account for $350 of the $1,974 total.
Scrap cost vs rework cost - which is worse? Scrap is usually worse per part because the part is lost entirely plus disposal cost, while rework recovers the part for added labor. This tool lets you fold a rework burden into the total so you can compare both.

Last reviewed 2026-05-12.