Foundry & Forging worked example
Casting Lot Cost at 72% lot cost allocation: a worked example
Suppose lot cost allocation falls to 72%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate total cost for a casting lot including metal, molding, cores, melt, cleaning, inspection, rework, and fixed setup cost.
The inputs for this scenario
- Castings in the lot: 240 castings (held at the documented default)
- Variable cost per casting: 68 $ / casting (held at the documented default)
- Lot cost allocation: 72 % (the input this scenario stresses; the baseline uses 100)
- Fixed lot setup cost: 1,800 $ (held at the documented default)
Working through the calculation
- The calculation starts from the formula this tool documents: Total casting lot cost = castings in the lot × variable cost per casting × lot cost allocation + fixed lot setup cost.
- Total casting lot cost works out to 13,550 $ at these inputs, and this is the headline figure for the scenario.
- Cost per casting works out to 56.46 $ / piece at these inputs.
- Variable casting lot cost works out to 11,750 $ at these inputs.
- Fixed lot setup cost works out to 1,800 $ at these inputs.
How this compares with the baseline
- Against the tool's baseline example, where lot cost allocation sits at 100% and the headline result is 18,120 $, this scenario comes in 25.22% below the baseline at 13,550 $.
- It totals a casting lot's cost by multiplying piece count, variable cost per casting, and an allocation factor, then adding fixed setup, and divides to get cost per casting. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.
Results at a glance
- Total casting lot cost: 13,550 $ (headline result)
- Cost per casting: 56.46 $ / piece
- Variable casting lot cost: 11,750 $
- Fixed lot setup cost: 1,800 $
Run it with your numbers
- To rerun this with your own numbers, open the live Casting Lot Cost calculator, set lot cost allocation to your actual value, and adjust the remaining inputs to match your operation.
Last reviewed 2026-05-12.