Volumetric weight divisors by carrier
Current dimensional and volumetric weight divisors for every major carrier, with effective dates and sources. Includes the July 2026 USPS change from 166 to 139.
| Carrier | Context | in / lb | cm / kg | Notes |
|---|---|---|---|---|
| DHL Express | International express | 139 | 5000 | The original 5000 divisor, now the international express standard.ShipMargin (compiled) |
| FedEx | Express and Ground | 139 | 5000 | Applied per package, not per shipment.ShipMargin (compiled) |
| UPS | Daily account rates | 139 | 5000 | What you get with a UPS account and scheduled collection.ShipMargin (compiled) |
| UPS | Retail counter rates | 166 | 5000 | A larger divisor means a lower billable weight, so a bulky box can be cheaper over the counter than on an account.ShipMargin (compiled) |
| USPSchanged 2026-07-12 | From 12 July 2026, over 1 cubic foot | 139 | 5000 | Changed from 166. Fractional inches now round up. Roughly 19% more billable weight on affected parcels.USPS Postal Explorer |
| USPS | Before 12 July 2026 (historical) | 166 | 5000 | Still shown as current by several of the calculators ranking for this query today.USPS Postal Explorer |
| Air freight (IATA) | Airline and forwarder air cargo | 166 | 6000 | 6000 cm³ per kg, or 167 kg per cubic metre. Gentler than courier rules, which is why air freight beats express on bulky consignments.Air cargo standard practice |
| Australia Post | Parcels above 0.25 m³ | 111 | 4000 | 250 kg per cubic metre — one of the harshest cubing rules among postal operators.ShipMargin (compiled) |
| Indian couriers | Delhivery, Blue Dart, DTDC, Xpressbees, Ekart | 139 | 5000 | Uniform across the major Indian networks, billed in half-kilo slabs.Shiprocket |
| Sea LCL | Weight or measure | — | — | Not a divisor: LCL bills per revenue tonne, whichever is greater of 1 m³ or 1,000 kg.Ocean freight standard practice |
A larger divisor means a lower billable weight, so the shipper wants the biggest number they can get. That is why the same UPS parcel can be cheaper over a retail counter, on 166, than on a daily account, on 139.
Questions people ask about this
What is a dim divisor?
The number you divide cubic volume by to get billable weight. It encodes how much a unit of space is worth to the carrier, and a smaller divisor means a bigger bill.
How often do divisors change?
Rarely, which is exactly why stale calculators go unnoticed. USPS held 166 for years before moving to 139 in July 2026. When one does change, every tool that hardcoded the old figure quietly starts giving wrong answers.
Related calculators
Where these numbers come from
Rates and rules change, and a calculator running on stale data is worse than no calculator. Every figure below carries the date we last checked it and a confidence level, so you can judge how much weight to put on it.
| Source | Publisher | Effective | Confidence |
|---|---|---|---|
| Dimensional weight divisors by carrier FedEx and UPS daily rates use 139 for inches and pounds, 5000 for centimetres and kilograms. UPS retail counter rates use 166. DHL Express uses 5000. Compiled from carrier documentation and multiple independent operators; FedEx blocked our automated read on 2026-08-17. | ShipMargin (compiled) | — | Corroborated |
| DMM 113.1.3 — dimensional weight, and Notice 123 price list Read directly off the Domestic Mail Manual, revision 7-12-26. It states the divisor as 139, applies dimensional weight only to parcels exceeding one cubic foot (1,728 cubic inches), requires each measurement to be rounded up to the nearest whole inch before multiplying, and requires the result to be rounded up to the next whole number. Nonrectangular parcels multiply the cubic dimensions by 0.785 first. Notice 123, effective the same date, confirms the threshold and the 108-to-130 inch oversize band. | USPS Postal Explorer | 2026-07-12 | Primary source |
| IATA volumetric ratio for air cargo (1:6000) 6000 cubic centimetres per kilogram, equivalently 167 kg per cubic metre. This is why an air-freight quote and a courier quote on the same box differ: couriers use 5000, giving 200 kg per cubic metre. | Air cargo standard practice | — | Corroborated |
| LCL weight-or-measure (W/M) revenue tonne LCL is quoted per revenue tonne: whichever is greater of 1 cubic metre or 1,000 kg. | Ocean freight standard practice | — | Corroborated |
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