If you ship internationally, you've probably noticed that the same package costs different DIM weight in different countries. That's because volumetric divisors vary by country and by carrier — and the differences add up faster than you'd think.
The general international standard
For express air shipping, the de facto global standard is 5000 cm³/kg. DHL Express, FedEx International, UPS International, and most national posts apply this divisor to their international services. If you're estimating costs for a typical international air parcel, 5000 is a safe default.
For ground / surface / postal services, the global standard skews toward 6000 cm³/kg — friendlier to shippers (lower DIM weight).
But there are notable exceptions worth knowing if you ship to or from these countries.
North America
United States
FedEx and UPS apply 139 in³/lb (= 5000 cm³/kg) on most services. USPS applies 166 in³/lb (= 6000 cm³/kg) on Priority Mail above 1 cubic foot. USPS Flat Rate boxes are exempt.
Canada
Canada Post uses 6000 cm³/kg — friendlier than the global 5000 standard. Canadian outbound parcels often bill less for volumetric weight than the equivalent US-origin package would.
Mexico
Estafeta, Redpack, and the major Mexican couriers typically apply 5000 cm³/kg. DHL Express and FedEx Mexico use 5000 as well.
Europe
Almost universally 5000 cm³/kg across the EU and UK. Specific operators:
- UK — Royal Mail: 5000 cm³/kg for international tracked services
- Germany — Deutsche Post DHL: 5000 cm³/kg for Paket and international
- France — La Poste / Chronopost: 5000 cm³/kg
- Italy — Poste Italiane / SDA Express: 5000 cm³/kg
- Spain — Correos: 5000 cm³/kg
- Norway — Posten / Bring: 5000 cm³/kg
- Netherlands — PostNL: 5000 cm³/kg
Asia
India
Major Indian couriers use 5000 cm³/kg for air services and may use 4000 cm³/kg for surface/road services in some regions. Blue Dart, DTDC, and India Post EMS all apply 5000 for international.
China
SF Express uses 5000 cm³/kg for air services and 6000 cm³/kg for ground/standard. EMS China (state post) uses 6000.
Japan
Japan Post International EMS uses 6000 cm³/kg — favorable for shippers. Yamato Transport and Sagawa (domestic Japan) are largely weight-based.
South Korea
Korea Post EMS uses 6000 cm³/kg. CJ Logistics uses 5000.
Singapore
Singapore Post and major couriers use 5000 cm³/kg. DHL/FedEx/UPS in Singapore use 5000.
Middle East
UAE / Aramex region
Aramex uses 5000 cm³/kg across its global network. Saudi Post and Emirates Post both use 5000 for international.
Oceania
Australia (the outlier)
Australia Post uses 4000 cm³/kg — the most aggressive divisor among major postal services worldwide. This means lightweight bulky packages bill at higher DIM weight on Australia Post than on virtually any global competitor.
Run rate comparisons across Australia Post, DHL Express (5000), and Aramex (5000) for every shipment. Australia Post's 4000 divisor can cost you 20-25% more in billable weight than competitors for the same package.
New Zealand
NZ Post uses 5000 cm³/kg. Local couriers (Post Haste, Castle Parcels) align with 5000.
South America
Brazil
Correios uses 6000 cm³/kg on SEDEX (express) and PAC (economy). DHL/FedEx Brazil use 5000.
Argentina, Chile
National posts and major couriers use 5000 cm³/kg. DHL Express and FedEx International use 5000.
Africa
Continent-wide, 5000 cm³/kg is the dominant divisor for express services. South African Post Office, Aramex Africa, and DHL Express all apply 5000.
The quick reference
| Region | Most common divisor | Notable exceptions |
|---|---|---|
| North America | 5000 (express) / 6000 (post) | USPS Flat Rate exempt |
| Europe | 5000 | Most uniform region |
| Asia | 5000 (air) / 6000 (ground) | SF Express splits by service |
| Middle East | 5000 | Mostly Aramex-aligned |
| Oceania | 5000 | Australia Post: 4000 |
| South America | 5000–6000 | Correios Brazil: 6000 |
| Africa | 5000 | — |
The practical takeaway
For international shipping estimates, use 5000 cm³/kg as your default. Adjust for these specific cases:
- Australia Post → use 4000
- Canada Post → use 6000 (favorable)
- Japan Post EMS → use 6000 (favorable)
- Most postal services (vs courier) → use 6000 (favorable)
- Air freight cargo → use 6000
For any specific shipment, always run the actual carrier's rate quote to confirm — divisors don't tell you about base rates, fuel surcharges, customs handling fees, or any of the other variables that determine total international shipping cost.
Run the calculation
Use the dimensional weight calculator to see exactly what your package would bill at across every major carrier.
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