PARCEL SHIPPING & BILLABLE WEIGHT
Dimensional weight (DIM)
Dimensional weight is a calculated shipping weight based on a package’s external volume divided by the carrier’s applicable dimensional divisor.
DIMENSIONAL WEIGHT IN PRACTICE
- Measure the packed boxUse the finished package and applicable measurement rules.
- Apply the divisorCalculate volume ÷ the correct dimensional divisor.
- Compare billable weightsApply rounding and compare with actual weight as required.
Use the agreed units, actual records and approved procedures for your operation.
A WORKED EXAMPLE
Same box.
Different divisors.
Consider a finished carton measuring 20 × 12 × 10 inches and weighing 10 lb. Its volume is 2,400 cubic inches. With a divisor of 166, 2,400 ÷ 166 = 14.46 lb, rounded up to 15 lb under the illustrated UPS rule. With 139, the result is 17.27 lb, rounded up to 18 lb. Comparing those results with the 10 lb actual weight gives 15 lb or 18 lb respectively for this simple example, before any other applicable rating rules.
One package, two illustrative calculations
| Assumed divisor | Volume calculation | Rounded DIM weight | Actual weight |
|---|---|---|---|
| 166 | 2,400 ÷ 166 = 14.46 lb | 15 lb | 10 lb |
| 139 | 2,400 ÷ 139 = 17.27 lb | 18 lb | 10 lb |
WHAT THIS MEANS FOR YOUR QUOTE
Agree the requirement before comparing quotes
Use the actual shipment, stock and service requirements. Record the billing unit, included work and responsibility for exceptions.
Put this term to work. Model the package rating assumptions with our dimensional weight calculator, then use the guide to comparing 3PL quotes to compare complete charges.
A LITTLE MORE CONTEXT
Questions about Dimensional weight
Is dimensional weight the package’s actual weight?
No. Actual weight is measured on a scale; dimensional weight is calculated from package size and the applicable divisor.
Are 139 and 166 universal air and ground divisors?
No. UPS’s cited US guidance distinguishes Daily and Retail rate types. Other carriers and agreements can use different rules.
Should 14.46 lb be quoted as the final billable weight?
Not under the illustrated UPS whole-pound rounding rule: it rounds up to 15 lb. Check actual weight and all other applicable rating rules too.
Source & example notes
UPS US: package dimensions and weight guidance.
Sources provide background on the linked topic. Product documentation describes a particular implementation; confirm the rules, contract and procedures that apply to your operation.
Quantities, costs and scenarios are illustrative, not operating targets, approved handling instructions or guarantees. Source guidance reviewed 22 October 2026.
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