Dimensional Weight Calculator — DIM Weight for Shipping
Calculate dimensional (DIM) weight for FedEx, UPS, and USPS shipments. Find your billable weight instantly.
Cubic Inches
924
DIM Weight
7 lb
Billable Weight
7 lb
DIM applies
Formula
**DIM Weight Formula**
Cubic Inches = Length × Width × Height (all in inches)
DIM Weight (lb) = ⌈Cubic Inches ÷ Divisor⌉
Billable Weight = max(DIM Weight, Actual Weight)
Divisors: UPS/FedEx = 139 | USPS = 166
Worked Example
**Example:** 14"×11"×6" box, UPS, 3 lb actual
Cubic Inches = 14 × 11 × 6 = 924
DIM Weight = ⌈924 ÷ 139⌉ = ⌈6.65⌉ = **7 lb**
Billable = max(7, 3) = **7 lb** (DIM weight applies)
Frequently Asked Questions
What is DIM weight?
Dimensional weight is a pricing technique where carriers charge based on the space a package occupies rather than its actual weight, when that yields a higher charge.
Why do UPS/FedEx use 139 and USPS use 166?
Each carrier sets their own divisor. A larger divisor means lower DIM weight — USPS is more lenient on large, light packages.
How can I reduce DIM weight charges?
Use the smallest box that safely fits your product. Avoid excess void fill space. USPS flat-rate boxes avoid DIM weight entirely.