Standard shipping label dimensions in inches and millimeters, the carriers and printers that use each, and why 4 by 6 is the one to buy.
If you buy one size, buy 4 by 6. It is the direct thermal label every major carrier reads and every ecommerce printer expects. The other sizes below exist for specific printers, regions and use cases.
Data checked: July 20, 2026 against carrier and printer sources listed at the foot of the page.
| Size (in) | Size (mm) | Orientation | Used by / for |
|---|---|---|---|
| 4 by 6 | 101.6 by 152.4 | Portrait | Universal carrier thermal label: USPS, UPS, FedEx, DHL |
| 6 by 4 | 152.4 by 101.6 | Landscape | The same 4 by 6 label, fed on its long edge |
| 4 by 6.75 | 101.6 by 171.5 | Portrait | FedEx thermal stock: 4 by 6 plus a 0.75 in doc tab |
| A6 | 105 by 148 | Portrait | Metric standard, common in Europe and for DHL |
| 4 by 4 | 101.6 by 101.6 | Square | Large barcodes, compliance and marketplace labels |
| 2-5/16 by 4 | 58.7 by 101.6 | Portrait | DYMO 30256 LabelWriter large shipping label |
| 3 by 2 | 76.2 by 50.8 | Landscape | Warehouse bin, asset and inventory labels |
| 2 by 1 | 50.8 by 25.4 | Landscape | Barcode, SKU and small product labels |
Inches convert at 1 in = 25.4 mm, so 4 by 6 in is exactly 101.6 by 152.4 mm.
| If you | Buy |
|---|---|
| Ship with USPS, UPS, FedEx or DHL | 4 by 6 direct thermal |
| Ship with FedEx and want the tear-off tab | 4 by 6.75 with doc tab |
| Sell in Europe or print A-series stock | A6, 105 by 148 mm |
| Run a DYMO LabelWriter for light mail | 2-5/16 by 4 (part 30256) |
| Label shelves, bins or products | 3 by 2 or 2 by 1 |
4 by 6 inches, which is 101.6 by 152.4 mm. It is the direct thermal format that USPS, UPS, FedEx and DHL all read on their automated lines, and it is what nearly every ecommerce printer expects.
Almost. A6 is 105 by 148 mm, slightly wider and slightly shorter than a 4 by 6 label, which is 101.6 by 152.4 mm. Carriers accept both. A6 is the common metric choice in Europe and for DHL.
The extra 0.75 inch is a doc tab at the top. It carries reference text and tears off, leaving a standard 4 by 6 label on the parcel. The FedEx supplies part number for this stock is 156148.
The common DYMO large shipping label, part 30256, is 2-5/16 by 4 inches, which is about 59 by 102 mm. It is smaller than a carrier 4 by 6 and suited to letter and small-parcel mail rather than automated carrier scanning.