Roofing, Siding & Exterior Building Products worked example

Coating Cost per Square at 99% transfer efficiency to product: a worked example

What does the result look like when transfer efficiency to product reaches 99%? The full calculation is worked below with real intermediate numbers. A coil-coating or panel-finishing planner uses it to price the paint and primer needed to finish a run of metal roofing or siding in a given color.

The inputs for this scenario

  • Squares coated in the run: 800 squares (unchanged)
  • Paint & primer cost per square: 6.2 $/square (unchanged)
  • Transfer efficiency to product: 99 % (raised for this scenario; the documented default is 90)
  • Line purge & color changeover: 95 $ (unchanged)

Working through the calculation

  • Applying the documented formula (Total coating cost = squares coated x coating cost per square x transfer efficiency + changeover) to the inputs above produces each figure below.
  • At this operating point the engine returns 5,005 $ for total coating cost per square cost, the number this scenario is built around.
  • At this operating point the engine returns 6.26 $ / piece for coating cost per square cost per unit.
  • At this operating point the engine returns 4,910 $ for variable coating cost per square cost.
  • At this operating point the engine returns 95 $ for fixed coating cost per square adder.

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 9.79% above the baseline at 5,005 $.
  • A figure at this level is achievable when transfer efficiency to product is genuinely sustained, not just peaked for a shift. It assumes a single blended paint/primer rate and one changeover event per run; multiple color changes or dual-coat systems need the fixed adder and per-square rate adjusted accordingly.

Results at a glance

  • Total coating cost per square cost: 5,005 $ (headline result)
  • Coating cost per square cost per unit: 6.26 $ / piece
  • Variable coating cost per square cost: 4,910 $
  • Fixed coating cost per square adder: 95 $

Run it with your numbers

  • Every input above is editable in the live Coating Cost per Square calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.