Bill of Materials (BOM)
A comprehensive list of all raw materials, components, sub-assemblies, and quantities needed to manufacture a finished product. The BOM is the foundation of cost estimation and production planning.
A Bill of Materials (BOM) is essentially the recipe for your product. It lists every single component, material, and sub-assembly required to build one finished unit, along with quantities, specifications, and often supplier information. For a simple product like a water bottle, the BOM might include 5-10 line items. For an electronic device, it could have hundreds.
The BOM serves multiple critical functions in manufacturing. First, it is the basis for cost estimation -- your factory uses the BOM to calculate material costs, which typically represent 40-60% of the total unit cost. Second, it drives procurement: the factory needs to order all BOM components with sufficient lead time before production starts. Third, it is essential for quality control, as inspectors verify that the correct materials and components are being used.
As a DTC founder, you may not create the BOM yourself (the factory or product designer typically does), but you should always review and understand it. Key things to look for: Are the materials specified correctly (e.g., food-grade silicone vs. industrial-grade)? Are there alternatives for expensive components? Does the BOM account for packaging and labeling materials? Understanding your BOM gives you leverage in cost negotiations because you can discuss specific line items rather than just the total price.
Why it matters
Request the full BOM from your supplier and review it line by line. If a component seems expensive, ask about alternative materials. Even small per-unit savings add up significantly at scale.
Practical Tip
Request the full BOM from your supplier and review it line by line. If a component seems expensive, ask about alternative materials. Even small per-unit savings add up significantly at scale.
You'll hear this when…
When briefing a factory
“"We need the Bill of Materials (BOM) process clearly documented in your quality control plan."”
When reviewing samples
“"Can you confirm which Bill of Materials (BOM) standard was applied during production of these samples?"”
When placing an order
“"The purchase order includes a clause requiring Bill of Materials (BOM) compliance for all production runs."”
Related Terms
Request for Quotation
RFQA formal document sent to manufacturers requesting pricing, lead times, and terms for producing a specific product. A well-prepared RFQ dramatically improves the quality and speed of supplier responses.
Minimum Order Quantity
MOQThe smallest number of units a manufacturer will produce in a single order. MOQs exist because factories need minimum volumes to justify setup costs, material purchases, and production line time.
Stock Keeping Unit
SKUA unique identifier for each distinct product variant in your inventory. Each combination of product, size, color, and material gets its own SKU for tracking and management purposes.
Original Equipment Manufacturer
OEMA manufacturer that produces goods based on the buyer's specifications and design. The buyer owns the design and IP, while the factory provides manufacturing capability.
Landed Cost
The total cost of a product delivered to your warehouse, including the product price, shipping, insurance, customs duties, customs broker fees, and drayage. The true cost you must use for pricing and margin calculations.
This term appears in every Bottlecap report.
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