Manufacturing Inventory Cost Calculator

Calculate the total valuation of manufacturing inventory across Raw Materials, Work-in-Process (WIP) at completion stages, and Finished Goods.

Three-Tier Manufacturing Inventory Valuation

Total Factory Inventory
—
RM + WIP + FG
Finished Goods Share
—%
ready for shipment
WIP Floor Value
—
active production line
Raw Stores Value
—
raw stock valuation

Total Manufacturing Inventory Formula

Total Inventory = Raw Materials Value + (Work in Process Cost × % Completion) + (Finished Goods Units × Unit Cost)
  • Raw Materials: Unopened raw stock, fasteners, and subcomponents in storage.
  • Work in Process (WIP): Semi-finished goods on the plant floor partially processed through labor and machine stages.
  • Finished Goods: Inspected, packaged goods ready for shipment to distribution centers or customers.

Step-by-Step Worked Example

Scenario: Quarterly plant floor inventory count at an industrial pump facility

Calculation Steps:

  1. Raw Materials = $120,000 (48.0%)
  2. Work in Process Valuation = $80,000 × 50% = $40,000 (16.0%)
  3. Finished Goods Valuation = 1,500 × $60 = $90,000 (36.0%)
  4. Total Inventory Valuation = $120,000 + $40,000 + $90,000 = $250,000
Result: Total manufacturing inventory value is $250,000 across raw stock (48%), in-process WIP (16%), and finished goods (36%).

How to Use This Calculator

  1. 1Enter total valuation of raw materials in warehouse stock.
  2. 2Input material cost committed to active work orders and their average stage of completion.
  3. 3Enter count and unit cost of completed finished goods.

Assumptions & Limitations

  • Valuation follows standard cost or lower of cost or net realizable value (LCNRV).
  • WIP completion reflects labor and overhead conversion progress.

Frequently Asked Questions

How do you determine WIP percentage completion?

Typically based on milestones in the routing sheet (e.g., machining complete = 40%, heat treat = 70%, final assembly = 90%, testing = 100%).

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