Dimensional, Volumetric & Cubic Weight Packaging Calculators

Stop paying carriers to ship air. Use our free browser-based tools—built for both Imperial (in / lb) and Metric (cm / kg) across the US, UK/EU, Australia, and Canada—to engineer cartons that stay below volumetric billing cliffs and marketplace size-tier cutoffs.

Quick Dimensional / Volumetric / Cubic Weight Estimator

Length

Width

Height

Actual Scale Weight

Carrier / Regional Divisor Preset

Chargeable / Billable Shipping Weight

14 lb

Volumetric weight (13.81 lb) exceeds actual weight (8.5 lb).

Raw Volumetric / Cubic Weight

13.81 lb

Cubic Volume

1,920 in³

Specialized Packaging Optimization Tools

Select a tool below to reverse-engineer box dimensions, audit regional FBA or Royal Mail tier edges, or pack master cartons.

Dimensional vs. Volumetric vs. Cubic Weight Across Global Regions

While the underlying physics is identical, carriers use different terminology and divisors depending on your shipping region:

United States (Dimensional Weight): UPS, FedEx, USPS (>1 cu ft), and Amazon US FBA divide cubic inches by 139 (or 166 at retail counters) and round up to the next whole pound.
Australia (Cubic Weight): Australia Post, StarTrack, and Amazon AU FBA multiply cubic meters by 250 kg/m³—which is algebraically identical to dividing cubic centimeters by 4,000.
United Kingdom & Europe (Volumetric Weight): DHL, UPS, FedEx, and Amazon UK/EU FBA divide cubic centimeters by 5,000 (and air freight by 6,000), whereas Royal Mail prices by strict box format dimensions rather than a volumetric divisor.
Canada (Volumetric Weight): Canada Post uses ÷ 5,000 (÷ 139 in/lb) for Priority, Xpresspost, and Expedited parcels, and ÷ 6,000 (÷ 166 in/lb) for Regular Parcels.