Conveyors worked example

Changeover Impact on Line Capacity with units not produced during changeover of 310 units: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop units not produced during changeover to 310 units, then walk the calculation through step by step. Estimate units and cost lost when a production line is unavailable during changeover.

The inputs for this scenario

  • Units not produced during changeover: 310 units (the input this scenario stresses; the baseline uses 620)
  • Contribution value per missed unit: 4.85 $ / unit (held at the documented default)
  • Changeover labor and setup cost: 950 $ (held at the documented default)
  • Startup scrap or expedite adders: 420 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Changeover impact cost = missed units × contribution value + labor/setup cost + startup adders.
  • Changeover capacity impact cost works out to 2,874 $ / changeover at these inputs, and this is the headline figure for the scenario.
  • Cost per missed unit works out to 9.27 $ / unit at these inputs.
  • Lost contribution during changeover works out to 1,504 $ at these inputs.
  • Setup and startup adders works out to 1,370 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where units not produced during changeover sits at 620 units and the headline result is 4,377 $ / changeover, this scenario comes in 34.35% below the baseline at 2,874 $ / changeover.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to units not produced during changeover, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. The lost-contribution term only represents real money when the line is capacity-constrained — if you have idle capacity and can make up the units later, the contribution loss overstates the true impact.

Results at a glance

  • Changeover capacity impact cost: 2,874 $ / changeover (headline result)
  • Cost per missed unit: 9.27 $ / unit
  • Lost contribution during changeover: 1,504 $
  • Setup and startup adders: 1,370 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Changeover Impact on Line Capacity calculator, set units not produced during changeover to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.