Dimensional Weight Calculator
Calculate dimensional (DIM) weight for FedEx, UPS, USPS, and DHL parcels using standard commercial and retail divisors with imperial and metric inputs.
Package Dimensions & Carrier Divisor
Billable Weight
58 lbs
DIM weight applied (+48 lbs)
Calculated DIM Weight
58 lbs
Raw: 57.55 lbs
Actual Scale Weight
10.0 lbs
5.8× dimensional multiplier
Total Cubic Volume
4.63 cu. ft.
8,000 cubic inches
Dimensional Weight Formula
DIM Weight (lbs) = \frac{\text{Length} \times \text{Width} \times \text{Height (inches)}}{\text{Carrier Divisor}}- Exterior Dimensions: Length × Width × Height measured at widest points, rounded to whole inches.
- Commercial Divisor 139: Standard for FedEx and UPS daily commercial account rates.
- Retail Divisor 166: Standard for USPS Priority Mail and retail retail counter rates.
- Metric Air Divisor 5,000: Standard IATA metric divisor (cm³ / 5,000 = kg).
- Billable Rule: Carriers bill the higher of scale weight or calculated DIM weight.
Step-by-Step Worked Example
Calculation Steps:
- Cubic Volume = 20 × 20 × 20 = 8,000 cubic inches (4.63 cu. ft.)
- Raw DIM Weight = 8,000 / 139 = 57.55 lbs
- Rounded DIM Weight = 58 lbs (rounded up to nearest whole pound)
- Billable Weight = max(10 lbs scale, 58 lbs DIM) = 58 lbs
- Dimensional Penalty = 58 lbs - 10 lbs = 48 billable lbs penalty (5.8× multiplier)
How to Use This Calculator
- 1Measure the exterior length, width, and height of your carton in inches or centimeters.
- 2Enter the actual weight shown on your scale.
- 3Select the carrier divisor (139 for UPS/FedEx daily, 166 for USPS).
- 4Review whether your shipment is subject to dimensional pricing.
Assumptions & Limitations
- Carriers measure at the extreme points of bulge or irregular surfaces.
- Carriers round fractional pounds up to the next full increment.
Frequently Asked Questions
Why do carriers use 139 as a dimensional divisor?
A divisor of 139 corresponds to an assumed density of approximately 10.7 pounds per cubic foot, ensuring carriers are fairly compensated when carrying bulky, low-density cargo that fills vehicle volume before reaching gross payload limits.
Does USPS use dimensional weight for Priority Mail?
Yes, USPS applies dimensional weight to Priority Mail, Priority Mail Express, and Parcel Select packages exceeding 1 cubic foot (1,728 cu. in.) using a divisor of 166.
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