Dimensional weight, or DIM weight, is a pricing method used by carriers to calculate shipping rates based on package volume rather than just weight. The cost of shipping a package reflects its weight and/or the amount of space it occupies in a carrier’s vehicle.
How Dimensional Weight Is Calculated
Dimensional weight is calculated by multiplying the length, width, and height of a package (in inches), then dividing by a dimensional factor (or DIM divisor) set by the carrier.
Carrier-Specific DIM Divisors
- USPS: Standard DIM divisor is 166.
- UPS: Standard DIM divisor is 139.
- FedEx: Standard DIM divisor is 139.
Negotiating DIM Factors
Carriers may allow negotiation of the DIM divisor based on your shipping volume and agreements. Lower DIM divisors result in lower dimensional weights and can reduce shipping costs.
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