What is SKU?
4 min read
A SKU (Stock Keeping Unit) is a unique code that identifies each specific product and its variants. It's the foundation of organized inventory — and the first thing serious brand owners need to get right.
What exactly is a SKU?
SKU stands for Stock Keeping Unit. It's typically a short code — 6 to 12 characters — that you create to uniquely identify each product variant you carry. If you sell a t-shirt in black and white, in sizes S, M, and L, that's six different SKUs: TSHIRT-BLK-S, TSHIRT-BLK-M, TSHIRT-BLK-L, TSHIRT-WHT-S, and so on.
Why SKUs matter for your business
Without SKUs, inventory becomes guesswork. You rely on memory, notebook notes, or vague Excel rows like "black shirts" — which doesn't tell you if it's the large or medium that's running out. With SKUs, you can track exact stock levels per variant, calculate your true COGS (Cost of Goods Sold), and set low-stock alerts before you sell something you don't have.
SKUs vs. Barcodes — what's the difference?
Barcodes (UPC, EAN) are standardized codes for products in the global marketplace. SKUs are internal codes you create for your own system. You don't need barcodes to use SKUs — your SKU is your identifier, and you define the format. The rule is simple: no two products can share the same SKU.
How to create a clean SKU system
A good SKU format is readable and consistent. A common approach: PRODUCTCODE-COLOR-SIZE. For example, HOODIE-NAVY-XL or SNEAKER-WHT-44. Keep codes short, uppercase, and hyphen-separated. Never reuse a SKU once a product is discontinued — historical data depends on it. Start clean and stay consistent.
The bottom line
Every piece of serious business management — profit calculation, inventory control, supplier orders, returns tracking — depends on accurate SKU data. It's not glamorous, but it's the infrastructure everything else is built on.
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