Calculator
Dimensional Weight Calculator for Shipping Boxes
Enter the outside size and real weight to see the billable weight at UPS, FedEx, USPS, DHL Express and air cargo in one table.
Billable weight is the higher of actual and dimensional weight
| Carrier | Dimensional | Billable | Billed on |
|---|
US carriers: each side rounded up to the whole inch and the result to the next pound. DHL and air cargo shown to 0.1 kg. Negotiated contracts can use other divisors — check with your carrier.
The rules used
US carriers (UPS, FedEx, USPS)
Cubic inches ÷ 139 = pounds. USPS only bills dimensional weight on parcels over 1 cubic foot (1,728 in³).
DHL Express
Cubic centimetres ÷ 5,000 = kilograms.
Air cargo
Common 1:6 ratio — cubic centimetres ÷ 6,000 = kilograms. Your forwarder confirms its own ratio.
Cut the billed weight before the box is made
A foldable magnetic box ships flat, and trimming 10–20 mm from each side can drop a full weight band. Foldable boxes · Size guide
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