Should rejected parts enter the denominator?

No. This version allocates expense to good parts; use the accepted production count for the year.

How do shared assets get allocated?

Apply your documented asset or production allocation before entering the cost. This calculator does not invent an allocation multiplier.

Yes. The same preventive bill divided across fewer good parts produces a higher unit cost.

Annual preventive cost remains visible, but cost per good part is undefined until positive output is entered.

Maintenance & Reliability calculator

Find preventive maintenance cost per good part for one year. Enter the matching preventive cost ledger and accepted production count.

Allocate annual preventive maintenance expense across good parts produced in the same period.

Annual PM Cost: Annual preventive labor, contractor, parts and consumable charges.
Annual Good Parts: Accepted physical parts produced over that same annual period.

Best suited to annual product cost allocation, preventive cost trend review.
Mixed products can need a different documented allocation driver. The ratio does not measure whether preventive tasks are effective.

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

Should rejected parts enter the denominator? No. This version allocates expense to good parts; use the accepted production count for the year.
How do shared assets get allocated? Apply your documented asset or production allocation before entering the cost. This calculator does not invent an allocation multiplier.
Can lower output raise unit cost without overspending? Yes. The same preventive bill divided across fewer good parts produces a higher unit cost.
What if the asset produced no good parts? Annual preventive cost remains visible, but cost per good part is undefined until positive output is entered.

Last reviewed 2026-10-06.