Shipping & Ecommerce
4x6 Inch vs 100x150mm Shipping Labels Explained
ThermalLabelUK Technical Team Updated: 2026-09-01 4 min read
Direct Answer Summary:
Yes! 4 x 6 inches equals 101.6 x 152.4mm. In the UK courier and thermal printer industry, '4x6 inch' and '100x150mm' are used interchangeably for the standard shipping parcel label.
Table of Contents
Comparing Imperial (4x6") and Metric (100x150mm)
Because thermal printers originated in the US with 4-inch wide printheads, 4x6 inches became the international standard. UK couriers list the specification as 100x150mm. Both specifications refer to the same physical label roll format.
Key Takeaways
- 4x6 inch and 100x150mm refer to the exact same shipping label size.
- Approved by Royal Mail, DPD, Evri, ParcelForce, and Amazon.
- Fits standard 4-inch wide thermal printers.
Recommended Thermal Labels for This Guide
Most Popular
SKU: TL-4X6-DT-500
500 Labels / Roll25mm CorePermanent Acrylic
4x6" (100x150mm) Direct Thermal Shipping Labels — 500 Labels/Roll
Industry-standard 4x6 inch (100x150mm) direct thermal shipping label rolls. Top-coated, smudge-proof paper with strong permanent adhesive for all UK couriers.
Universal Compatibility: Fits Zebra, Rollo, Munbyn, Brother, Dymo 4XL & Phomemo Printers
Single Roll Price:
£4.99ex VAT
Bulk Rate (50+ Rolls):
£4.00ex VAT / roll