What is BOM (Bill of Materials)?
Turkish: BOM
A BOM lists every raw material, part, subassembly, and quantity needed to manufacture or assemble a product accurately.
What is a BOM?
BOM (Bill of Materials) is the structured list of parts, raw materials, subassemblies, and quantities required to manufacture a product. For production teams it acts like a recipe; for procurement it becomes a demand list; for finance it supports product costing.
A simple BOM has one level: the finished product and the parts used directly in it. A multi-level BOM also includes intermediate assemblies and the components inside them. For example, an electronic device BOM may include the case, screen, circuit board, screws, cables, labels, and packaging.
Why Does It Matter?
If the BOM is wrong, production planning, purchasing, and inventory calculations become wrong as well. A missing quantity can stop a production line; poor revision tracking can cause an old component to be used in a new product version.
A useful BOM line usually includes part number, description, quantity, unit, scrap factor, alternate parts, supplier, and revision. An engineering BOM may describe the design intent, while a manufacturing BOM reflects how the product is actually built on the shop floor.
BOM data is a core input for MRP calculations and is usually managed inside an ERP system together with inventory, purchasing, and production modules.
Related Terms
ERP manages finance, inventory, sales, production, HR, and supply chain processes through a shared enterprise data model.
MRP (Material Requirements Planning)MRP uses bills of materials, inventory, orders, and lead times to plan which materials production needs and when.