PLM, BOM & Digital Thread worked example

BOM Change Cost at 75% changes requiring full rollout: a worked example

What does the result look like when changes requiring full rollout reaches 75%? The full calculation is worked below with real intermediate numbers. Use it to benchmark engineering-change throughput cost and target process streamlining.

The inputs for this scenario

  • BOM changes processed per year: 650 changes (unchanged)
  • Fully loaded cost per change: 220 $/change (unchanged)
  • Changes requiring full rollout: 75 % (raised for this scenario; the documented default is 65)
  • Change-board overhead: 15,000 $ (unchanged)

Working through the calculation

  • Applying the documented formula (Annual change cost = BOM changes x cost per change x full-rollout share + board overhead) to the inputs above produces each figure below.
  • At this operating point the engine returns 122,250 $ for total bom change cost, the number this scenario is built around.
  • At this operating point the engine returns 188 $ / piece for bom change cost per unit.
  • At this operating point the engine returns 107,250 $ for variable bom change cost.
  • At this operating point the engine returns 15,000 $ for fixed bom change cost adder.

How this compares with the baseline

  • Against the tool's baseline example, where changes requiring full rollout sits at 65% and the headline result is 107,950 $, this scenario comes in 13.25% above the baseline at 122,250 $.
  • A figure at this level is achievable when changes requiring full rollout is genuinely sustained, not just peaked for a shift. The single loaded cost-per-change value is an average; a class-3 form-fit-function change and a documentation typo cost wildly different amounts, so segment by change type for precision.

Results at a glance

  • Total bom change cost: 122,250 $ (headline result)
  • Bom change cost per unit: 188 $ / piece
  • Variable bom change cost: 107,250 $
  • Fixed bom change cost adder: 15,000 $

Run it with your numbers

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

Last reviewed 2026-05-12.