How LTL freight shipping rates are actually built, layer by layer

There is no number anywhere in this article, and that is the point. LTL rates move with class, density, lane, accessorials and fuel, and any figure published here would be stale within weeks and wrong for most freight today. What does not move is the machine that produces the number. This is that machine, layer by layer.

Start with the base tariff, not the discount

Carriers price from base rate tariffs, and almost nobody pays base: pricing is expressed as a discount from it. This is why a headline discount means nothing on its own. A deep discount from a high base can cost more than a shallow discount from a low one, and comparing discounts across carriers is comparing numbers with different denominators.

Freight class, the published tariff underneath everything

The classification system assigns commodities to classes in a published tariff. For some commodities the assignment follows density; for others the tariff fixes a class outright, or varies it by packaging. It is a lookup, not a calculation, which is why a calculator is a starting point rather than an answer, and why the class on the bill of lading is the single input with the most leverage over the final rate.

Density, or why space is priced like weight

A trailer runs out of space before it runs out of legal weight on most LTL freight, so rating has to charge for the cube a shipment occupies as much as for the pounds it weighs. Density is how the two are reconciled. A light, bulky pallet is expensive for its weight because it is really buying space; a dense one is cheap for its weight because it is not. It is also why non-stackable freight costs more: the carrier loses the cube above it, which is the economic point behind pallet dimensions and a flat top.

The lane is a network question

The same pallet costs different amounts in different directions, because a rate reflects the carrier’s network rather than the map. Terminals at both ends, balanced flows, full linehauls: favourable. A destination the carrier must interline to a partner: costly, and slower. This is the layer no shipper can see from outside, and it is most of the reason quotes for one shipment vary as widely as they do.

The minimum charge, and why small shipments live on it

Below a certain size a shipment stops being priced by weight and class and hits the carrier’s minimum charge, because a pickup, the terminal handlings and a delivery cost the carrier much the same whether the pallet is heavy or light. If your freight is small, the minimum is your real market, and carriers set theirs independently, which quietly changes who is cheapest.

Accessorials and fuel sit on top of all of it

Everything above prices the linehaul. Liftgate, residential, limited access, inside delivery and their relatives are added per service, one by one down the list a base rate excludes, and fuel is applied as a percentage that changes weekly. Two consequences follow: a rate quoted long before pickup ages, and a quote that omitted an accessorial was never lower, only incomplete. The full anatomy is on the shipping cost page.

Why two carriers price one pallet differently

Because every layer above differs by carrier. Different base tariffs, different discounts, different network shapes on your lane, different minimums, different accessorial schedules, different fuel tables. None of them is lying and none of them is uniquely right; each is pricing your freight into a different network. That is the real argument for shopping a shipment across carriers, and it has nothing to do with anyone being generous.

How to buy well inside this machine

Get the class right, measure honestly, name every accessorial, then compare complete quotes rather than discounts. The mechanism rewards accuracy and punishes optimism, which is the argument running through everything on this site, and the reason we ask more questions before quoting rather than send corrections after invoicing.