UPS, FedEx, DHL and USPS dim divisors

These are the divisors this calculator uses, checked 12 November 2026 from each carrier’s public dimensional-weight documentation. Always confirm on your own rate sheet — account holders are sometimes quoted a different number.

UPS Daily (US): 139 for inches and pounds; 5000 for centimetres and kilograms.
FedEx: 139 (in³/lb) and 5000 (cm³/kg) on the widely published retail/account rule.
DHL Express: volumetric weight commonly uses 5000 cm³/kg, which is equivalent to 139 in³/lb.
USPS Priority Mail: 166 (in³/lb) and 6000 (cm³/kg) for cuboid retail packages that meet the service’s size rules.

Worked example, 12×12×12 in, scale weight 5 lb:

UPS/FedEx/DHL dim = ceil(1728 ÷ 139) = ceil(12.43) = 13 lb. Billable 13 lb.
USPS dim = ceil(1728 ÷ 166) = ceil(10.41) = 11 lb. Billable 11 lb.

If the scale had read 14 lb, actual weight would win on every carrier in this example. Open the calculator and change the sides to match your carton.