The carrier may compare volume-based weight with actual gross weight and charge on whichever is greater. Use the divisor and rounding rules in the relevant service quotation.
Why carriers use dimensional weight
A large lightweight shipment consumes more vehicle or aircraft space than its mass suggests. Dimensional weight provides a way to account for this imbalance.
An air freight planning example
For one package measuring 120 × 80 × 75 cm, volume equals 720,000 cm³. At a planning divisor of 6,000, dimensional weight equals 120 kg. If the package physically weighs 85 kg, the higher dimensional figure is the starting point for chargeable weight.
Divisors are not universal
Air, express parcel and road networks can use different factors, minimums and rounding rules. Always compare the provider’s published tariff terms against any calculator.
Measure after packing
Strapping, skids and protective material increase outer dimensions. Re-measuring the finished package can avoid discrepancies during carrier acceptance.
Primary references
Rules, carrier terms and local procedures can change. Check the applicable primary guidance for your shipment.
Chargeable weight can exceed gross weight
An airy 120 × 80 × 100 cm carton weighs only 45 kg but has 0.96 m³ volume; at a 6,000 cm³/kg divisor its volumetric weight is 160 kg. Check your actual tariff divisor and piece rounding rather than assuming every carrier bills the same way.
This is an illustrative planning example, not a current quotation, legal instruction or promise of transport capacity. Confirm shipment-specific requirements with the responsible carrier, broker or regulator.