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Why a spreadsheet can't tell you your true product cost — and how ERPNext rolls up material, sub-assemblies, operations and scrap into one number you can price against.
Ask three people in a factory what a product costs to make and you'll often get three answers — because the number is scattered across purchase bills, a costing spreadsheet, and someone's memory of how long the line takes. ERPNext replaces that guesswork with a single, structural calculation: a Bill of Materials (BOM) that rolls up the cost of every raw material and sub-assembly, plus a Routing of operations that adds real conversion cost from each workstation's hourly rate, plus scrap. This paper explains how that roll-up actually works in ERPNext — using the real BOM, Routing and Workstation objects — and why it gives you a manufactured cost you can defend, price against, and trust for margin decisions.
The complete paper — every section, in a clean branded PDF you can share with your team. Free, no email required.
It sums the BOM's raw material cost (every component and sub-assembly, priced from its own BOM) plus operating cost (each routing operation's time × its workstation hourly rate) plus the treatment of scrap and by-products, giving one total manufactured cost that ERPNext uses to value the finished good.
A BOM lists what goes into a product — the materials and sub-assemblies and their quantities — and rolls up material cost. A Routing lists how it's made — the ordered operations, each on a workstation with a time in minutes — and drives operating cost. A BOM with operations enabled uses a routing to add that conversion cost.
It isn't a guess. Each workstation's net hour rate is built up from its own per-hour operating-cost components — things like electricity, rent, machine depreciation, consumables and labour — which ERPNext sums. Operation cost is then that hourly rate applied to how long each operation runs.
Yes. The manufactured cost ERPNext computes flows into stock valuation and the financial ledgers, and material rates can be sourced from your live valuation rate. So costing, GST-compliant inventory valuation and reporting stay consistent instead of living in separate spreadsheets.
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Kochi (Kadavanthra & Infopark) · Thiruvananthapuram · across India & overseas · In business since 2011