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Dimensional weight calculator
Dimensional weight of common boxes (road, 300 kg/m³)
| Box (cm) | m³/piece | Dim. weight |
|---|---|---|
| 30 × 20 × 20 | 0.012 | 3.6 kg |
| 40 × 30 × 30 | 0.036 | 10.8 kg |
| 60 × 40 × 50 | 0.120 | 36.0 kg |
| 100 × 100 × 100 | 1.000 | 300.0 kg |
| Pallet 120 × 100 × 140 | 1.680 | 504.0 kg |
Why carriers charge more than the scale shows
Dim. weight = length × width × height (m) × factor (kg/m³) · chargeable weight = greater of actual and dimensional
Trucks and planes run out of space before they run out of payload when cargo is light and bulky. So freight is charged on the greater of actual and dimensional weight. Air freight uses the IATA standard of 167 kg/m³ (1 kg per 6,000 cm³); US domestic parcel carriers use divisors like 139 in³/lb, and road LTL uses density-based freight classes. A 60×40×50 cm box of pillows weighs 3 kg on the scale but is charged as 20 kg by air. Smaller packaging is cheaper freight.
Last updated: · Methodology and sources