Dimensional Weight: How to Calculate and Optimize
Dimensional weight (DIM) can make light packages expensive. Learn the formula and strategies.
How do you calculate dimensional weight?
Formula: (Length x Width x Height in inches) ÷ DIM divisor. UPS/FedEx: 139. USPS Ground Advantage: 166. Example: 20x16x12" box = 3,840 ÷ 139 = 28 lbs DIM. You pay higher of actual or DIM weight.
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| Carrier | Service | Price | Delivery Time | |
|---|---|---|---|---|
| Example | 20x16x12" (actual 10 lbs) | Charged as 28 lbs | UPS/FedEx | |
| UPS/FedEx | DIM Divisor | 139 | Standard | |
| USPS | DIM Divisor | 166 | Ground Advantage |
20x16x12" (actual 10 lbs)
DIM Divisor
DIM Divisor
* Prices shown are discounted ShipWave rates. Actual rates vary by exact dimensions, weight, and origin/destination.
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Understanding DIM Weight
Carriers charge by dimensional weight for light, bulky packages. Light, bulky items cost the same to transport as heavy packages of the same size.
Formula: (L x W x H) ÷ Divisor = DIM Weight. Compare to actual weight; you pay the higher.
Pro Tips to Save More
USPS for Bulky/Light Items
USPS's 166 divisor is more generous than UPS/FedEx's 139.
Frequently Asked Questions
- Yes for Ground Advantage (divisor 166). Priority Mail does not - you pay actual weight only.
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