20x12x12 box dimensional weight

2,880 cubic inches (1.67 cu ft, 0.0472 m³). Often used for bulk apparel, bedding.

Billable weight floor by carrier

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

Stepping down to a 20 × 14 × 10 in box drops the UPS and FedEx floor to 21 lb.

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

21lb

You pay for 13 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 20x12x12 box?

2,880 cubic inches ÷ 139 = 20.72, rounded up to 21 lb for UPS Daily Rates and FedEx. USPS also bills 21 lb since the July 2026 change.

How heavy does a 20x12x12 box need to be to avoid DIM charges?

With UPS and FedEx, anything packed under 21 lb is billed as 21 lb. Above that, you pay actual weight.

Carrier rules verified 2026-09-30. Methodology