Verified Mathematical Model & Formulation
US Domestic DIM (lbs) = (Length (in) × Width (in) × Height (in)) / 139 (or 166) Metric DIM (kg) = (Length (cm) × Width (cm) × Height (cm)) / 5000
Determines the billable weight in pounds by calculating package volume in cubic inches and dividing by carrier DIM factors (139 for retail/daily rates, 166 for negotiated commercial accounts).
Configurable Parameters & Standard Units
- Length: (Default: 18 in)
- Width: (Default: 14 in)
- Height: (Default: 12 in)
- Actual Weight: (Default: 7 lb)
- DIM Divisor (139 FedEx/UPS Standard): (Default: 139 count)
Standard Worked Example & Practical Verification
Scenario: Shipping a 18" × 14" × 12" box weighing 7 lbs via FedEx domestic ground.
Calculated Solution
22 lbs DIM Weight (Billed at 22 lbs, not 7 lbs)
Practical Takeaway: Trimming 2 inches off each side would reduce billed weight from 22 lbs down to 14 lbs.
Frequently Asked Questions
What is DIM factor 139 vs 166?
Carriers moved from 166 to 139 to capture more revenue on lightweight e-commerce boxes. A 139 factor yields a higher billable weight than 166.