Formula
DIM weight (lb) = length × width × height (inches) ÷ divisor, rounded up to the next pound. 139 and 166 are the common US divisors. Check the divisor in your carrier’s rate sheet.
Example
A 16 × 12 × 8 in box weighing 6 lb: 1,536 ÷ 139 = 11.05, so the DIM weight is 12 lb and you pay for 12 lb, not 6.
How to pay less
- Use the smallest box that protects the product.
- Avoid too much filler; use right-sized packaging.
- Light, bulky items (pillows, lamps) are hit the hardest.
Frequently asked questions
Why does DIM weight exist?
A big, light box takes the space of several boxes in a truck or plane.
Do I measure the box or the product?
The sealed box, at the longest point of each side.
See also
Results are estimates for information only and are not financial, legal or medical advice. Rates, taxes and fees vary — confirm with a professional or your lender.