DIM weight calculator: box vs poly mailer
Carriers bill the larger of actual weight and dimensional (DIM) weight. A rigid box ships air; a poly mailer takes the shape of what is inside. Enter your product and the box you use today to compare.
Your product
Box you use today
Box weight is your own estimate (carton plus void fill).
Questions
What is the DIM divisor in 2026?
UPS and FedEx use 139 for daily rates. USPS moved from 166 to 139 on 12 July 2026, for packages over one cubic foot.
Why does a poly mailer save money?
It adds almost no weight and no empty volume, so small and soft items usually stay on actual weight instead of DIM weight.
Test it with real samples
We reply within one business day with sizes, mil and a delivered price.
- Free sample kit shipped to your US address
- Delivered prices, DAP to your door
- Orders from one pallet, mixed sizes welcome
- Plain, printed with your brand, or fully neutral
- Meet in person in January–February 2027
Prefer email? sales@kargopekusa.com