18x12x12 box dimensional weight

2,592 cubic inches (1.5 cu ft, 0.0425 m³). Often used for cookware, bulk apparel.

Billable weight floor by carrier

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

Stepping down to a 16 × 12 × 12 in box drops the UPS and FedEx floor to 17 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

19lb

You pay for 11 lb of air on every box.

A box 1 inch smaller on every side bills 4 lb less.

What is the dimensional weight of a 18x12x12 box?

2,592 cubic inches ÷ 139 = 18.65, rounded up to 19 lb for UPS Daily Rates and FedEx. USPS also bills 19 lb since the July 2026 change.

How heavy does a 18x12x12 box need to be to avoid DIM charges?

With UPS and FedEx, anything packed under 19 lb is billed as 19 lb. Above that, you pay actual weight.

Carrier rules verified 2026-09-30. Methodology