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What is Dimensional Weight (DIM Weight)?
Dimensional Weight (also called volumetric weight or DIM weight) is a pricing technique used by almost every major carrier to price bulky, lightweight packages based on the space they occupy in a truck or aircraft, not just their physical weight. The formula is simple:
The carrier then charges you on whichever is greater: your package's actual weight or the DIM weight. This is called the Billing Weight.
2026 DIM Divisor Reference by Carrier
| Carrier / Service | DIM Divisor | Unit | Applies To |
|---|---|---|---|
| UPS Ground / FedEx Ground | 139 | in³ / lb | Domestic parcels ≤ 150 lbs |
| FedEx Express / UPS Air | 139 | in³ / lb | Domestic express parcels |
| IATA Air Cargo Standard | 166 | in³ / lb | International & domestic air freight (= 6,000 cm³/kg) |
| LTL Cubic / Spot Pricing | 194 | in³ / lb | LTL carriers (XPO, OD, Estes, SAIA) using cubic programs |
| Amazon FBA (Outbound) | 139 | in³ / lb | FBA fulfillment fee tiers (non-oversize standard) |
Standard air cargo volumetric divisors are established under IATA (International Air Transport Association) guidelines, while domestic ground parcel divisors are published annually in the official service tariffs of major parcel carriers.
DIM Weight FAQ
When does DIM weight apply to my shipment?
DIM weight applies when the package volume divided by the carrier divisor exceeds the actual physical weight. This happens most often with lightweight, bulky items like pillows, foam, empty cardboard boxes, electronics with large packaging, or any product with a lot of air space in the box.
How do I reduce DIM weight charges?
Use right-sized packaging: eliminate empty space with smaller boxes, use compression packaging, increase product density by reducing oversized packaging or dunnage. For LTL shipments, consolidating multiple packages onto pallets often avoids DIM billing entirely since LTL uses freight class, not DIM weight (unless under cubic pricing).
Is DIM weight the same as volumetric weight?
Yes. DIM weight, dimensional weight, and volumetric weight all refer to the same concept — a pricing weight calculated from package cubic volume divided by a carrier-specific factor called the DIM divisor.
Does UPS or FedEx always use DIM weight?
UPS and FedEx apply DIM weight to all packages over 1 cubic foot (1,728 in³). They compare the DIM weight (at divisor 139) against actual weight and bill the greater of the two. Small packages under 1 cubic foot are typically billed at actual weight only.