Dimensional Weight Calculator
Calculate dimensional weight for shipping costs based on package dimensions and compare with actual weight
About this calculator
The Dimensional Weight Calculator helps you determine shipping costs by calculating the dimensional weight (DIM weight) of packages based on their length, width, and height. Shipping carriers use either actual weight or dimensional weight - whichever is greater - to determine shipping rates. This calculator compares both weights to show you which will be used for pricing, helping you optimize packaging decisions and accurately estimate shipping costs for e-commerce, business shipping, or personal use.
How to use
Enter your package's length, width, and height in inches or centimeters, then input the actual weight. The calculator will compute the dimensional weight using standard carrier formulas (typically dividing cubic size by 139 for domestic shipments). It will then compare both weights and show which determines your shipping cost.
Frequently asked questions
What is dimensional weight and why do carriers use it?
Dimensional weight accounts for package size, not just weight. Carriers use it because large, lightweight packages take up valuable cargo space.
What is the standard dimensional weight divisor?
Most carriers use 139 for domestic shipments and 166 for international shipments when measuring in inches.
When is dimensional weight used instead of actual weight?
Carriers charge based on whichever is greater - dimensional weight or actual weight. Large, light packages typically use dimensional weight.