Multi-Carrier Dim & Volumetric Weight Comparator
Select your shipping region and enter your carton once to compare chargeable weight side by side across local postal networks, commercial couriers, Amazon FBA, and air freight.
6.48 lb/ft³ (103.8 kg/m³)
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How Postal Exemptions Beat Commercial Couriers on Bulky Parcels
National postal networks often waive or soften volumetric weight rules on standard-sized parcels compared to commercial express couriers:
- USPS (United States): Exempts parcels measuring 1,728 in³ (1 cu ft) or less from dimensional weight, billing purely on actual weight.
- Royal Mail (United Kingdom): Uses fixed box dimensions—Small Parcel (45 × 35 × 16 cm, 2 kg) and Medium Parcel (61 × 46 × 46 cm, 20 kg)—with zero volumetric divisor.
- Australia Post: Applies a 250 kg/m³ (÷4,000) cubic weight factor on standard parcels, but exempts prepaid flat-rate satchels (up to 5 kg) when packed within satchel dimensions.
- Canada Post: Uses a gentler ÷6,000 divisor for Regular Parcels versus ÷5,000 for Expedited, Xpresspost, and Priority services.