DIM divisors for UPS and FedEx.

What the divisor does

The divisor converts cubic inches into billable pounds. A 139 divisor produces more pounds than a 166 divisor for the same box, so a lower divisor costs you more.

Standard versus negotiated divisors

Carriers publish a standard divisor, often 139 for domestic ground, but your contract can specify a different one. A better divisor is a real negotiation win; a worse one quietly raises the cost of every bulky shipment.

Why it has so much leverage

Because the divisor applies to every dimensioned package you ship, a small change moves your entire bill. It is one of the highest-leverage terms in a carrier agreement.