What is Freight Class 500? Density, Examples & Cost

Freight class 500 corresponds to a density of under 1 pounds per cubic foot. Density is weight divided by volume, so a 35 lb shipment occupying 40 cubic feet has a density of 0.9 lbs/ft³ - class 500. Compute your shipment's density with the Freight Class Calculator.

Class 500 is the highest and most expensive class, for the lightest, bulkiest, or highest-value freight. Commodities that commonly rate at this class include:

• Ping pong balls
• Bags of foam packing peanuts
• Inflated bulky goods
• Low-density bulky display items

These are typical examples - the binding class is always the commodity's actual NMFC provision, which you can confirm with the NMFC Lookup.

LTL carriers sell trailer space, so density drives price. Class 500 is among the cheapest classes and more expensive than class 400. Because it sits on the light, bulky end of the scale, class 500 occupies a lot of trailer space for little weight, so the rate per hundredweight (CWT) is relatively high.

If your shipment is borderline between class 400, packaging changes that adjust density can move it into an adjacent class and change the bill. A 35 lb shipment in 40 ft³ rates class 500 (0.9 lbs/ft³); it is already near the lightest end of the scale. Always confirm before quoting with the NMFC Lookup or the NMFC API.

Class 500's position on the freight class ladder, with its immediate neighbors:

• Class 400 (1-2 lbs/ft³) - denser than class 500, so it rates a step cheaper. Typical freight: deer antlers and taxidermy.
• Class 500 (<1 lbs/ft³) - the highest and most expensive class, for the lightest, bulkiest, or highest-value freight.

Because adjacent classes are separated by narrow density bands, an inch of extra packaging or a lighter-than-expected load can shift a shipment between them - so accurate measurement matters most near these boundaries. See Freight Class Explained for the complete 18-class ladder.

You can estimate class 500 yourself in three steps before you ever request a quote:

1. Measure the packaged shipment - length, width, and height in inches, including the pallet, crating, and any overhang.
2. Convert to cubic feet and divide: volume = (L × W × H) ÷ 1,728, then density = weight ÷ volume.
3. Match the density to the chart. A result of under 1 pounds per cubic foot lands in class 500.

Because this class sits at the open end of the scale, almost any further change in bulk keeps it at class 500. The Freight Class Calculator runs this calculation automatically, and the NMFC API returns the authoritative class for a known commodity so your TMS never has to guess.

Most class 500 billing adjustments come from two avoidable mistakes:

• Measuring the product, not the packaged unit. Class is based on the shipment as tendered - pallet, crating, and overhang included. Measuring only the product understates volume and overstates density.
• Assuming density alone. Some commodities carry a fixed NMFC class regardless of density. Verify the item's actual provision instead of trusting the density estimate.

When a carrier inspects a shipment and finds the class understated, they reclassify it and rebill the difference, frequently adding an adjustment fee. For freight near class 500, the safest workflow is to measure precisely, calculate density, and then confirm the commodity's actual NMFC provision rather than trusting a single estimate. If the density comes back just above the range, the shipment may actually rate the cheaper class 400;

The procedure in How to Determine Freight Class walks through measuring, calculating density, and confirming the class so a carrier inspection doesn't surprise you. To classify at scale, the NMFC API returns the class and NMFC item number for any commodity in a single call - the same data, automated for your quoting or TMS pipeline.