Bill of materials, production orders, work in progress, wastage and job costing — so the cost per unit is a calculated number, not an estimate.
Ask a small manufacturer what a unit costs to make and you usually get a confident number that has not been recalculated since raw material prices last moved. That gap between believed cost and actual cost is where manufacturing margin quietly disappears.
Closing it requires three things the shop floor rarely has: a maintained bill of materials, recorded actual consumption against each production run, and honest wastage logging. With those, cost per unit is arithmetic. Without them it is a guess that gets quoted to customers.
Versioned BOMs per product so cost and consumption reflect the current design.
Planned quantity, material issue, WIP by stage and recorded actual output.
Planned versus actual per run — the report that finds yield loss and stale BOMs.
Material, labour and overhead per order, producing a defensible margin per job.
Which raw material batches went into which finished lot, and where that lot shipped.
Workstation output, downtime, rejection and rework by reason and value.
Production is a chain of recorded events, each affecting stock and cost.
The single most valuable report in a manufacturing system is the variance between what the bill of materials said a run should consume and what it actually consumed. That number contains everything: yield loss, unlogged wastage, theft, and a bill of materials that stopped being accurate two design revisions ago.
Most manufacturers who start measuring it find the bill of materials is the problem — which is good news, because it is the cheapest thing to fix.
For job-shop and make-to-order work, each order needs its own cost: materials issued, labour hours, machine time and a defensible overhead allocation. That produces a real margin per job, which is the only sound basis for quoting the next one — and it usually reveals that a category of work being taken enthusiastically is barely profitable.
Where you supply regulated or quality-audited customers, lot traceability matters: which raw material batches went into which finished lot, and where that lot shipped. Recorded consumption per run makes that answerable in minutes rather than being reconstructed from registers during an audit.
Straight answers, including the ones that rule us out.
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