Amazon SKU examples: codes you can read at a glance, and never need to change
A good Amazon SKU example is short, readable and unique: TS-BLM-A101 tells you it is a blue medium t-shirt from brand A, series 101. This guide explains what a SKU is on Amazon, how it differs from a UPC and an ASIN, and gives worked Amazon SKU examples for common catalogs, using the rules Amazon publishes for sellers.
Key takeaways
- A SKU, or stock keeping unit, is your own code for a product; Amazon says SKUs are usually 8 to 10 letters and numbers.
- The SKU is yours, the UPC identifies the product for everyone, and the ASIN is Amazon's 10-character catalog ID.
- Every product and variation needs its own SKU, and Amazon says existing SKUs should stay unchanged unless you delete the product.
- Build SKUs from the category first, then variation, then brand or series, and avoid leading zeros and look-alike letters.
- If you skip SKUs, Amazon creates one for you, but your own system makes inventory, reorders and reports far easier to read.
What a SKU is on Amazon
A stock keeping unit, or SKU, is a code sellers use to identify products in their inventory. Amazon's seller blog says SKUs are usually made up of 8 to 10 letters and numbers, and that each product you sell should have its own SKU, often tied to features like size, color, price or manufacturer.
On Amazon, the SKU does more than organize a spreadsheet. Amazon says it uses SKUs to connect your units to the product detail page in its catalog: when you enter or upload a SKU, Amazon creates a record for it. That is why the SKU you choose on day one follows the product through listings, FBA shipments, reports and reorders.
- SKU
- Your codeOnly your business uses it
- UPC or GTIN
- The product's codeSame for every seller
- ASIN
- Amazon's catalog ID10 letters and numbers
- FNSKU
- Amazon barcode on FBA unitsLinks a unit to your account
SKU vs UPC vs ASIN
| Code | Who creates it | What it identifies | Example use |
|---|---|---|---|
| Seller SKU | You | Your listing of a product | Inventory, reports, reorders |
| UPC, EAN, ISBN | GS1 or the publisher | The product, for every seller | Creating or matching a listing |
| ASIN | Amazon | The product page in Amazon's catalog | Search, ads, reviews |
| FNSKU | Amazon | Your units in FBA | The X00 label on each unit |
The ASIN, short for Amazon Standard Identification Number, is assigned by Amazon to each product page. The UPC, or Universal Product Code, is a common product code in the US and comes from GS1. Your Amazon seller SKU sits on top of both as your own identifier.
Amazon's own example makes the difference clear: if you and a competitor sell the same product, you have different SKUs for it, but the same UPC. Most products on Amazon have an ASIN, a GTIN and a SKU, but only the SKU is for your internal inventory. Our guide to buying UPC codes for Amazon covers product IDs.
Why SKU numbers matter for inventory management
Amazon's seller blog lists what a SKU system does for a business. It keeps inventory organized, so you can see at a glance what is in stock, track products at every step and cut errors such as phantom stock. It helps you plan ahead for busy seasons, sales and marketing.
It makes shipping more efficient, showing what is ready, shipped or stuck. And it lets third party service and fulfillment providers understand your inventory.
It also matters to customers. A clear view of stock means you can keep popular products available and reorder in time, which is the difference between a sale and an out of stock listing. When a customer buys, the SKU is how the sale is recorded against your stock.
| Job | What the SKU does | Where you see it |
|---|---|---|
| Track stock | Counts units by product and variation | Manage All Inventory |
| Reorder | Shows sell through per SKU | Inventory and restock reports |
| Ship to Amazon FBA | Links your units to the right product | Send to Amazon |
| Report sales | Groups orders by product | Business Reports |
| Share data | Common code with suppliers and 3PLs | Your inventory file |
Amazon notes that a seller with only a few products may not need a SKU system until the catalog expands, but that for an extensive inventory, SKUs set you up for success.
It is easier to start with a simple scheme by product category than to rename hundreds of Amazon SKUs later, because every change means a new SKU and new product information to enter. For businesses selling on several channels, the same SKU everywhere keeps the process of tracking orders and stock simple. Our guide to how to make money on Amazon covers the business models that grow into large catalogs.
How to build an Amazon SKU, step by step
- Start with 2 or 3 characters for the top-level category, supplier, department or location.
- Add middle characters for the subcategory or the variation, such as color and size.
- End with characters for the brand or series, numbered in the order products launch.
- Add each SKU to your inventory system with the product's name, category, price and variations.
This is the structure Amazon's Singapore seller blog recommends, with its own t-shirt example: TS for t-shirts, BL for blue, M for medium, then the brand and series. Hyphens between the parts are optional but make codes easier to read aloud and to scan in reports.
Amazon SKU examples by catalog type
| Catalog | Amazon SKU example | Reads as |
|---|---|---|
| Apparel | TS-BLM-A101 | T-shirt, blue, medium, brand A, series 101 |
| Apparel, next size | TS-BLL-A101 | Same shirt in large |
| Beauty | SK-SER30-B204 | Skincare, 30 ml serum, brand B, series 204 |
| Bundle | BN-SHCO-C12 | Bundle: shampoo and conditioner, brand C, bundle 12 |
| Multi-pack | KT-TWL-P3-D05 | Kitchen towel, pack of 3, brand D, series 5 |
| Resale by condition | BK-LIKENEW-1044 | Book, used like new, item 1044 |
| Seasonal | GD-HOSE-SU-E07 | Garden hose, summer line, brand E, series 7 |
Each example follows the same rule: the first characters tell you the category, the middle tells you the variation, and the end tells you the brand or series. Anyone on your team can read a report of these SKUs without opening the listing. Our guide to selling used items on Amazon covers the condition grades a resale SKU can encode.
Tips Amazon gives for good SKUs
Category first
The first characters show where the product belongs.
Sequential numbers
New products get the next number, so newer items have higher numbers.
No leading zero
Some software reads 0112 as 112; start with a letter instead.
No look-alike letters
Avoid characters like O and 0, or I and 1, that are easy to confuse.
Keep it short
Amazon suggests 8 to 12 characters and no more than 16.
Do not reuse manufacturer numbers
The SKU is your code, not the supplier's.
These tips come from Amazon's seller education blog in Singapore, and they apply anywhere: a SKU is read far more often than it is written, so short and unambiguous beats clever. Amazon's US blog adds the rule that matters most once you list: keep existing SKUs unchanged unless you delete the product.
How SKUs work in Seller Central
You enter the SKU when you list a product. In Seller Central, go to Catalog, then Add Products, search by GTIN, ASIN or name, and either select the existing product and fill in the SKU field with your offer, or choose Create a new listing and fill in the product details, including the SKU. Your SKUs then appear under Inventory, in Manage All Inventory.
If you leave the SKU blank, Amazon says it creates and assigns one for you. That works, but machine SKUs are random strings that tell you nothing in a report, which is why most sellers set their own from the start.
SKU rules to follow on Amazon
- One SKU for every product and variation you sell
- Keep existing SKUs unchanged unless you delete the product
- Remember an inventory file upload replaces data for SKUs already listed
- Create a new SKU when Amazon requires one, such as a barcode type change
- Keep SKUs consistent across your other sales channels
Amazon's barcode FAQ confirms that a new SKU does not cost you reviews, because ratings and reviews belong to the ASIN and feedback to your seller profile. Our guide to Amazon commingled inventory explains when resellers needed new SKUs in 2026.
SKUs as the catalog grows
A SKU system pays off when the catalog grows. Amazon's blog lists what SKUs make easier: keeping inventory organized, spotting what to reorder, planning for busy seasons and sales, following orders through fulfillment, and sharing inventory data with third party logistics and fulfillment providers.
Very large catalogs have one more thing to watch. Amazon applies a High-Volume Listing Fee to sellers with more than 100,000 active non-media SKUs, so sellers near that level should archive SKUs they no longer sell rather than leaving them active.
If your catalog already has inconsistent SKUs, our catalog management service can map old codes to a clean system without breaking listings.
Amazon SKU examples: FAQ
What is an example of an Amazon SKU?
TS-BLM-A101: a blue, medium t-shirt from brand A, series 101, built category first, then variation, then brand and series.
What does SKU mean on Amazon?
Stock keeping unit: your own code for a product, which Amazon uses to connect your units to its product page.
Is a SKU the same as an ASIN?
No. The ASIN is Amazon's 10-character catalog ID; the SKU is your own code for your offer.
Is a SKU the same as a UPC?
No. A UPC identifies the product for every seller; your SKU is unique to your business.
How long should an Amazon SKU be?
Amazon's blogs suggest 8 to 10 or 8 to 12 characters, and no more than 16 for readability.
Can I change a SKU on Amazon?
Amazon says to keep existing SKUs unchanged unless you delete the product; change means a new SKU.
Do I have to create my own SKUs?
No. If you do not, Amazon creates and assigns one, but your own system is easier to read.
Does a new SKU lose my reviews?
No. Amazon says reviews belong to the ASIN, and seller feedback to your profile.
Should SKUs start with a zero?
No. Amazon's blog warns some software drops leading zeros, so start with a letter.
Do variations need separate SKUs?
Yes. Each size, color or pack count should have its own SKU.
Sources
- What is a SKU, and how does it help ecommerce sellers?, Sell on Amazon blogLast verified September 24, 2026.
- SKU: definition and how to set up codes, Amazon Singapore seller blogLast verified September 24, 2026.
- SKU limits and the High-Volume Listing Fee, Seller Central helpLast verified September 24, 2026.
- FBA barcode choice and labeling FAQ, Seller Central helpLast verified September 24, 2026.
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