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BOM Cost Roll-up Calculator

Calculate multi-level assembly costs from indented BOM data

Format: level, part_number, description, qty, unit_cost

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About the BOM Cost Rollup

A multi-level BOM carries cost at every assembly level, and rolling it up correctly — extended cost per part, sub-assembly totals, top-level grand total — is exactly the kind of arithmetic spreadsheets get wrong at 3pm.

Paste an indented BOM with levels and unit costs; the calculator computes extended costs, rolls sub-assemblies into parents, and produces the grand total with the full tree visible. Everything computes client-side, so proprietary cost data never leaves your machine.

How to use

  1. Paste your indented BOM with levels, quantities, and unit costs.
  2. Read extended and rolled-up costs per assembly level.
  3. Verify the grand total before it goes into a quote.