SKU Management and Inventory Tracking
What You’ll Learn
You’ll establish a systematic approach to assigning SKUs and tracking inventory that prevents stockouts, reduces carrying costs, and provides real-time visibility into your product levels. Proper SKU management and inventory tracking are critical to preventing lost sales, managing cash flow, and scaling your ecommerce business efficiently.
Key Concepts
A SKU (Stock Keeping Unit) is a unique identifier assigned to each distinct product in your inventory for tracking and management purposes. Unlike universal product codes (UPCs), SKUs are internal-only identifiers customized to your business structure and can encode valuable information about product attributes, location, or supplier. Effective inventory tracking requires integration between your ecommerce platform, warehouse management system, and supplier ordering system to maintain accurate stock levels across multiple sales channels and prevent overselling.
- SKU Structure and Naming Convention: Create a logical SKU format that encodes product category, type, color, and size (e.g., TSH-BLU-M-001 for t-shirt, blue, medium). Consistent, meaningful SKUs make inventory management, order fulfillment, and financial analysis significantly easier as your product catalog grows beyond 100 items.
- Real-Time Inventory Synchronization: Implement automated inventory sync between your ecommerce platform and warehouse management system to update stock levels in real-time across channels. Manual inventory updates cause overselling disasters—if you sell the same item on both Shopify and Amazon, they must share the same inventory pool to prevent promising products you don’t have.
- Safety Stock Calculation: Maintain a buffer inventory for fast-moving items using the formula: (average daily sales × lead time in days) + safety stock percentage. For example, if a product sells 5 units daily with a 10-day supplier lead time, you need at least 50 units in stock plus 20% safety stock (10 units) to prevent stockouts.
- Inventory Audits and Cycle Counting: Conduct monthly cycle counts on high-value or fast-moving items and quarterly full inventory audits to identify shrinkage, misplacements, or data discrepancies. Regular audits prevent the surprise of discovering you’re out of stock during a marketing campaign or that you’ve been selling products that don’t physically exist.
Practical Application
Design a SKU naming convention for your product catalog and reassign SKUs to all current products, documenting the structure in a spreadsheet for staff reference. Set up inventory tracking in your ecommerce platform with minimum stock alerts and weekly low-inventory reports to ensure you identify reorder needs before items go out of stock.