16x16x16 box dimensional weight

4,096 cubic inches (2.37 cu ft, 0.0671 m³). Often used for bedding, pet supplies.

Billable weight floor by carrier

Packed lighter than this, you are billed this weight anyway.

Stepping down to a 18 × 18 × 12 in box drops the UPS and FedEx floor to 28 lb, 2 lb less per parcel.

This box is over 1 cubic foot, so USPS applies dimensional weight.

Your box Rounded up by USPSWhole numbers, nothing rounded

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USPS · divisor 139

Priority Mail, Priority Mail Express, Ground Advantage, Parcel Select

Billed on dimensions

Billable weight

30lb

You pay for 18 lb of air on every box.

A box 1 inch smaller on every side bills 5 lb less.

What is the dimensional weight of a 16x16x16 box?

4,096 cubic inches ÷ 139 = 29.47, rounded up to 30 lb for UPS Daily Rates and FedEx. USPS also bills 30 lb since the July 2026 change.

How heavy does a 16x16x16 box need to be to avoid DIM charges?

With UPS and FedEx, anything packed under 30 lb is billed as 30 lb. Above that, you pay actual weight.

Carrier rules verified 2026-09-30. Methodology