Dimensional Weighing
In 2019 USPS is adopting DIM weight (Dimensional Weighing) pricing. Dimensional weight involves factoring the box size into pricing. If the dimensional weight exceeds the actual weight, the shipping rate is based on the dimensional weight instead. Essentially, the bigger the box, the higher the cost.
• Dimensional weighing for Priority Mail.
• Dimensional weighing for Priority Mail Express.
• Dimensional weighing for Parcel Select.