What is the USPS DIM weight divisor?

USPS uses a DIM divisor of 166 (Length x Width x Height / 166). Importantly, USPS only applies dimensional weight to packages exceeding 1 cubic foot (1,728 cubic inches). Packages under 1 cu ft are billed purely by actual scale weight.

What are USPS non-standard dimension surcharges?

USPS charges a $4.00 surcharge for packages with any length exceeding 22 inches, a $15.00 surcharge if length exceeds 30 inches, and a $15.00 surcharge if total volume exceeds 2 cubic feet (3,456 cubic inches).

Shipping Box Dimensional (DIM) Weight Calculator

Calculate exact dimensional weight vs scale weight for USPS, UPS, and FedEx. Avoid unexpected size surcharges and cut shipping costs.

Package Dimensions & Weight

USPS / UPS / FedEx

Length (in)

Width (in)

Height (in)

Actual Scale Weight

lbs

Carrier & Service

Billable Weight Breakdown

Billable Weight

Carrier Billed Weight 3.0 lbs Charged at Dimensional Weight

Box Volume 840 cu in (0.49 cu ft)

Actual Scale Weight 2.50 lbs

Dimensional (DIM) Weight 5.06 lbs (billed as 6 lbs)

Total Girth ($L + 2W + 2H$) 46.0 inches

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Frequently Asked Questions

Expert answers on dimensional weight calculations, carrier divisors, and shipping box optimization.

What is Dimensional (DIM) Weight in shipping?

Dimensional (DIM) weight represents a package's density. Carriers like USPS, UPS, and FedEx calculate the theoretical weight of a box based on its volume (Length × Width × Height / Divisor) and charge whichever is higher: the actual scale weight or the dimensional weight.

What is the difference between USPS, UPS, and FedEx DIM divisors?

USPS uses a divisor of 166 and only applies DIM weight to packages larger than 1 cubic foot (1,728 cubic inches).
UPS and FedEx use a standard daily commercial divisor of 139 (and 166 for retail counter rates) applied to all package sizes.

How do I avoid USPS size surcharges?

To avoid USPS non-standard dimension fees, keep your longest package side under 22 inches (avoiding the +$4.00 fee) and under 30 inches (avoiding the +$15.00 fee). Additionally, keep total volume under 2 cubic feet (3,456 cubic inches).