Australia Post uses a divisor of 4000 cm³/kg — notably more aggressive than the 5000 used by most carriers globally. This means lightweight bulky packages will bill at higher DIM weight on Australia Post than on most international competitors.
Awaiting dimensions. Enter package details to compute billable weight.
| Service | Imperial (in/lb) | Metric (cm/kg) | Notes |
|---|---|---|---|
| Parcel Post (domestic) | — | 4000 | All packages |
| Express Post (domestic) | — | 4000 | All packages |
| International Standard | — | 4000 | All packages |
| International Express | — | 4000 | All packages |
Domestic Australian shipments, AU-NZ and AU-Asia lanes
Lightweight bulky goods (4000 divisor hits hard)
Run an actual rate quote on Australia Post's official site to confirm pricing and check current surcharges.
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Australia Post uses a divisor of 4000 cm³/kg (metric) — this carrier publishes only metric divisors. The DIM weight formula is volume divided by this number, rounded up to the nearest whole pound or kilogram.
Australia Post applies dimensional weight to packages above No minimum. The billable weight is always the greater of the actual weight or the calculated DIM weight.
Use right-sized packaging — every cubic inch you save is divided by the divisor and removed from your billable weight. Avoid excessive void fill and consider custom box sizes for products you ship frequently. For occasional shippers, use the calculator above to test packaging changes before you commit to new materials.