Guides
Freight math, explained without the folklore.
The density formula, the 2025 NMFC changes, trailer linear feet, and the operational details that decide whether a quote survives the terminal. Each guide is written for US shippers and cites the source behind the claim.
All guides
How to Calculate Freight Class (Formula + Worked Examples)
The 2025 density formula, a step-by-step worked example, and the measuring mistakes that push a shipment into a higher — and more expensive — class.
2025 NMFC Freight Class Changes: The 13-Tier Density Scale
What changed on July 19, 2025, why Classes 77.5, 110, 150, 200, and 500 are not density outputs, and how to check a freight class without using an old chart.
Why Freight Class Changes After Pickup (and How to Dispute It)
A carrier reweigh or re-dimension can change your freight class after the BOL is signed. Here is why it happens, what to check, and how to build a clean dispute file.
How to Calculate Linear Feet for LTL Freight (With Examples)
A step-by-step guide to trailer linear feet: row packing, orientation, stacking, mixed loads, and the pounds-per-linear-foot check.
How to Find an NMFC Code for Your Freight (Without Guessing)
The NMFC is licensed, and the 2025 update consolidated about 2,000 listings. How to find the current item, describe your freight correctly, and keep a stale code off the BOL.