Do repeated checks increase the part count?

No. Include their expense, but count each physical part once for this per-part measure.

Can I use shipped quantity as the denominator?

Use shipped quantity only if every shipped part is also the inspected population. Otherwise the result would be cost per shipped part.

No. Fixed-cost dilution, part mix or a reduced inspection scope can lower the average without a faster inspection process.

Cost per part is undefined. The period expense is still a valid accounting amount, but a positive part count is needed for the assessment.

Quality & Metrology calculator

Allocate a recorded inspection cost to the parts actually inspected. Use total inspection expense and a distinct part count from the same period.

Calculate inspection expense per inspected part on one consistent period and cost basis.

Total Inspection Cost: Recorded inspection labor, overhead and consumables for the period.
Parts Inspected: Distinct parts inspected in that same period.

Best suited to inspection expense review, part family cost allocation.
The result does not measure inspection effectiveness or defect detection probability. Different part mixes and inspection plans can change average cost.

U.S. manufacturing runs at 75.7% of capacity (Federal Reserve, Aug 2026). New factory orders are up 8.5% year over year (Census).

Do repeated checks increase the part count? No. Include their expense, but count each physical part once for this per-part measure.
Can I use shipped quantity as the denominator? Use shipped quantity only if every shipped part is also the inspected population. Otherwise the result would be cost per shipped part.
Does a lower average prove inspection is more efficient? No. Fixed-cost dilution, part mix or a reduced inspection scope can lower the average without a faster inspection process.
What happens with zero inspected parts? Cost per part is undefined. The period expense is still a valid accounting amount, but a positive part count is needed for the assessment.

Last reviewed 2026-10-06.