Roofing, Siding & Exterior Building Products worked example

Scrap Trim Cost at 4.32% length lost to edge trim & offcuts: a worked example

This worked example runs the scrap trim cost numbers for a tougher week than the baseline: 4.32% length lost to edge trim & offcuts instead of the typical 6%. Estimates scrap trim cost on a metal roofing or siding line from coil feet run, material cost per foot, the percent lost to trim and offcuts, and a flat haul-off charge.

The inputs for this scenario

  • Coil feet run through the line: 5,000 linear ft (held at the documented default)
  • Material cost per foot: 1.4 $/ft (held at the documented default)
  • Length lost to edge trim & offcuts: 4.32 % (the input this scenario stresses; the baseline uses 6)
  • Scrap haul-off & handling: 75 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Total scrap trim cost = coil feet x cost per foot x scrap rate + haul-off.
  • Total scrap trim cost works out to 377 $ at these inputs, and this is the headline figure for the scenario.
  • Scrap trim cost per unit works out to 0.08 $ / piece at these inputs.
  • Variable scrap trim cost works out to 302 $ at these inputs.
  • Fixed scrap trim cost adder works out to 75 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where length lost to edge trim & offcuts sits at 6% and the headline result is 495 $, this scenario comes in 23.76% below the baseline at 377 $.
  • Use it when quoting a coil run, evaluating a trimming setup change, or allocating scrap cost into product costing. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Total scrap trim cost: 377 $ (headline result)
  • Scrap trim cost per unit: 0.08 $ / piece
  • Variable scrap trim cost: 302 $
  • Fixed scrap trim cost adder: 75 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Scrap Trim Cost calculator, set length lost to edge trim & offcuts to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.