Freight Class Calculator

Quick overview

Enter the shipment length, width, height, and weight. The calculator converts the shipment cube into cubic feet, calculates freight density in lb/ft3, and maps that density to an estimated freight class using common density ranges. You can switch between inches and centimeters or pounds and kilograms while keeping the result in the freight units used for LTL density review.

This page works as an LTL freight class calculator, NMFC class calculator starting point, and freight density and class calculator. It does not replace an official NMFC lookup, but it helps you understand whether cube, packaging, or pallet build may be influencing class and freight cost.

What is freight class?

Freight class is a rating category used in less-than-truckload shipping. It helps carriers price freight by grouping shipments with similar transportation characteristics. Lower classes usually represent denser, easier-to-handle freight, while higher classes often represent freight that is bulky, light, difficult to handle, or more exposed to damage and liability.

For many shipments, density is one of the first numbers a shipper can calculate. Density tells you how many pounds fit into each cubic foot of trailer space. A dense pallet uses carrier capacity differently from a large lightweight pallet, even if both are easy to move with a forklift.

Why density matters

Density = Weight (lb) / Cubic Feet.

Cubic feet = length x width x height / 1,728 when dimensions are entered in inches. The calculator converts metric inputs into inches and pounds first, then calculates density in lb/ft3. Higher density generally maps to a lower estimated freight class because the shipment makes better use of trailer space.

How freight class is estimated

This freight class calculator uses the density table provided on the page: above 50 lb/ft3 maps to Class 50, 35 to 50 maps to Class 55, 30 to 35 maps to Class 60, 22.5 to 30 maps to Class 65, 15 to 22.5 maps to Class 70, 13.5 to 15 maps to Class 77.5, 12 to 13.5 maps to Class 85, 10.5 to 12 maps to Class 92.5, 9 to 10.5 maps to Class 100, and progressively lower densities map to higher classes down to Class 500 below 1 lb/ft3.

The estimate is useful because it shows the link between shipment dimensions, weight, cubic feet, and density. If a pallet is large and light, the calculated density will be low and the estimated class will usually be higher. If the same weight can be packed into a smaller cube without creating damage or handling problems, the density improves and the estimated class may move lower.

For best results, measure the finished shipping unit. Include the pallet, wrap, overhang, top cap, corner boards, and any part of the load that affects occupied space. Freight density based on product-only dimensions can look accurate in a spreadsheet but fail when the carrier measures the wrapped pallet.

Freight class worked example

A palletized LTL shipment weighs 480 lb and measures 48 x 40 x 48 inches after wrapping. The cubic volume is 48 x 40 x 48 / 1,728 = 53.3 cubic feet.

Limitations of density-only classification

• Freight class may also depend on handling, stowability, and liability. A shipment can have a density that points to one class while the official NMFC item, commodity description, or packaging requirement points to another class.
• Use this calculator for planning, quote preparation, and invoice review, not as the final authority on classification. Confirm the official NMFC item and class before tendering freight, especially for regulated, fragile, high-value, hazardous, or hard-to-stow commodities.
• If a carrier reclasses a shipment, compare its measured dimensions and weight with your records. Photos, weight tickets, pallet dimensions, product descriptions, and the bill of lading can help you review whether the change came from density, commodity classification, or measurement differences.