5,832 cubic inches (3.38 cu ft, 0.0956 m³). Often used for pillows, lightweight bulky goods.
Packed lighter than this, you are billed this weight anyway.
| Carrier | Divisor | DIM weight |
|---|---|---|
| USPS | 139 | 42 lb |
| UPS (Daily Rates) | 139 | 42 lb |
| FedEx | 139 | 42 lb |
| UPS (Retail Rates) | 166 | 36 lb |
| DHL Express (International) | 5000 | 19.5 kg |
Stepping down to a 22 × 18 × 12 in box drops the UPS and FedEx floor to 35 lb, 7 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
Sample box shown. Type your own size and weight below; the result updates instantly.
USPS · divisor 139
Priority Mail, Priority Mail Express, Ground Advantage, Parcel Select
Billable weight
42lb
You pay for 25 lb of air on every box.
A box 1 inch smaller on every side bills 6 lb less.
| USPS | ÷139 | 42 lb |
| UPS | ÷139 | 42 lb |
| FedEx | ÷139 | 42 lb |
| UPS Retail | ÷166 | 36 lb |
| DHL Express | ÷5000 | 19.5 kg |
5,832 cubic inches ÷ 139 = 41.96, rounded up to 42 lb for UPS Daily Rates and FedEx. USPS also bills 42 lb since the July 2026 change.
With UPS and FedEx, anything packed under 42 lb is billed as 42 lb. Above that, you pay actual weight.
Carrier rules verified 2026-09-30. Methodology