Fulfillment & Operations

SKU

Stock Keeping Unit - a unique alphanumeric code identifying and tracking individual products.

1 min readLast updated Apr 2026

Stock Keeping Unit - a unique alphanumeric code identifying and tracking individual products.

Why It Matters

SKUs are the foundation of inventory management. Without consistent SKU architecture, you can't accurately track stock levels, sales by variant, or reorder needs. Poor SKU management leads to overselling, stockouts, and costly fulfillment errors.

Practical Example

Scenario

A apparel brand structures their SKU system for a new product line.

Calculation

Format: [Category]-[Style]-[Color]-[Size]. Example: TSHIRT-CREW-BLK-L. This enables filtering by any attribute: all crew necks, all black items, all larges.

Result

Structured SKUs enable automated reorder reports ('all large sizes low'), warehouse efficiency (grouped by category), and analytics by any attribute.

Pro Tips

  • 1Create a consistent SKU format before scaling—retrofitting is painful
  • 2Include searchable attributes: category, color code, size
  • 3Keep SKUs to 10-15 characters max for warehouse scanning efficiency
  • 4Never reuse SKUs for new products—it corrupts historical data

Common Mistakes to Avoid

Using supplier SKUs instead of creating your own (inconsistent)
Making SKUs too long or including special characters
No logical structure—just random strings you can't parse

Frequently Asked Questions

Related Terms

Inventory Turnover

A ratio measuring how many times inventory is sold and replaced over a given period.