Dimensional Weight (DIM)
DIM and billable weight from L*W*H and carrier divisor.
Example
You enter
- Length (in) 12
- Width (in) 12
- Height (in) 12
- Actual weight (lb) 5
- Carrier UPS_Daily
You get
- Dimensional weight 12.4 lb
- Billable weight 13.0 lb
- Divisor 139
Checked against published worked examples from: UPS / FedEx (carrier-published).
Details, formula, and sources
Formula or tableDIM weight (lb) = L × W × H (in) / divisor. Billable weight = max(DIM, actual). UPS, FedEx and USPS round each dimension up to the next whole inch and bill the next whole pound (FedEx and UPS since Aug. 18, 2025); USPS uses 139 from July 12, 2026 (166 before) and applies DIM only above 1,728 cu in. Divisors are carrier-published per tariff (UPS, FedEx, USPS, DHL, LTL freight); cited by carrier name only.
Source and editionCarrier-published tariffs (UPS Daily / Retail, FedEx Ground / Express per the FedEx 2026 Service Guide, USPS per the July 12, 2026 DMM change (Federal Register 2026-09785), DHL Express, LTL freight). Cited by carrier name only; tariff text not reproduced.
Free accessFree at each carrier's published rate guide (ups.com/rates, fedex.com/rates, usps.com, dhl.com).
What governsMath aid for personal verification. The ELD on the truck and the carrier tariff are the legal record. State limits may be lower than federal.
API field nameslength_in, width_in, height_in, actual_weight_lb, carrier, dim_lb, billable_lb, divisor
- Divisor table data/trucking/dim-divisors.json keyed to carrier-tiercarrier-attributed per row