Roofing, Siding & Exterior Building Products worked example

Coating Cost per Square at 65% transfer efficiency to product: a worked example

Suppose transfer efficiency to product falls to 65%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimates coating cost across a roofing or siding run from squares coated, paint and primer cost per square, coating transfer efficiency, and a flat color-changeover charge.

The inputs for this scenario

  • Squares coated in the run: 800 squares (held at the documented default)
  • Paint & primer cost per square: 6.2 $/square (held at the documented default)
  • Transfer efficiency to product: 65 % (the input this scenario stresses; the baseline uses 90)
  • Line purge & color changeover: 95 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Total coating cost = squares coated x coating cost per square x transfer efficiency + changeover.
  • Total coating cost per square cost works out to 3,319 $ at these inputs, and this is the headline figure for the scenario.
  • Coating cost per square cost per unit works out to 4.15 $ / piece at these inputs.
  • Variable coating cost per square cost works out to 3,224 $ at these inputs.
  • Fixed coating cost per square adder works out to 95 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where transfer efficiency to product sits at 90% and the headline result is 4,559 $, this scenario comes in 27.2% below the baseline at 3,319 $.
  • It computes the total and per-square coating cost for a production run by applying transfer efficiency to your paint spend and adding fixed changeover cost. 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 coating cost per square cost: 3,319 $ (headline result)
  • Coating cost per square cost per unit: 4.15 $ / piece
  • Variable coating cost per square cost: 3,224 $
  • Fixed coating cost per square adder: 95 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Coating Cost per Square calculator, set transfer efficiency to product to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.