How do you calculate freight density?

Divide total shipment weight by total cubic feet, including packaging and pallet. A 500 lb shipment occupying 60 ft³ has a density of 500 ÷ 60 = 8.33 lb/ft³.

What freight class is 8.33 lb/ft³?

Under standard density-based NMFC breakpoints, roughly 8 lb/ft³ typically falls around class 100-110, though the exact class depends on the commodity's NMFC listing. Always confirm against the item number.

How do I measure the cubic feet of a pallet?

Multiply the palletized length × width × height in inches, then divide by 1,728 to convert to cubic feet. Use the full outer dimensions including overhang and the pallet itself, since carriers do.

Why did the carrier reclass my shipment?

Carrier reweighs and re-dimensions freight; if your declared class assumed higher density than the actual lb/ft³, they bump you to a higher, costlier class. Calculating density accurately before tender prevents these corrections.

Does higher density mean cheaper freight?

Generally yes for density-based commodities — the more a shipment weighs per cubic foot, the lower the class and the lower the rate per hundredweight, because it uses trailer space efficiently.

What is the density adjustment factor?

It's a percentage multiplier on raw density, useful for what-if analysis — for example modeling 90% to test a class breakpoint or 100% to leave density unchanged, as in the 8.33 lb/ft³ example.

Packaging & Logistics calculator

Freight Class Density Calculator

Freight class density is pounds per cubic foot, the single most important number in classifying LTL freight under the NMFC system. Shipping clerks, LTL account managers, and anyone building bills of lading use it because carriers set density-based freight classes — and therefore rates — directly from lb/ft³. Denser freight lands in lower, cheaper classes; light, bulky freight climbs into expensive high classes. Getting density right up front prevents carrier reweighs, reclass charges, and the invoice surprises that follow a mis-declared class.

What this calculator does

Calculate shipment density in pounds per cubic foot to estimate NMFC freight class for LTL shipments.
Use it to estimate freight class, avoid reclass fees, and decide whether tighter packaging can move you to a cheaper class.
It computes shipment density in pounds per cubic foot and applies an optional adjustment factor to that density.

Formula used

Freight density = shipment weight ÷ shipment volume
Adjusted density = freight density × density adjustment

Inputs explained

Shipment weight:
Shipment volume:
Density adjustment factor:

How to use the result

Use it before tendering LTL freight to determine the density-based NMFC class and avoid reclass corrections.
Density is only one input to NMFC class — stowability, handling, and liability can override density-based class for certain commodities, so confirm against the item's NMFC listing.

Current U.S. benchmarks

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Common questions

How do you calculate freight density? Divide total shipment weight by total cubic feet, including packaging and pallet. A 500 lb shipment occupying 60 ft³ has a density of 500 ÷ 60 = 8.33 lb/ft³.
What freight class is 8.33 lb/ft³? Under standard density-based NMFC breakpoints, roughly 8 lb/ft³ typically falls around class 100-110, though the exact class depends on the commodity's NMFC listing. Always confirm against the item number.
How do I measure the cubic feet of a pallet? Multiply the palletized length × width × height in inches, then divide by 1,728 to convert to cubic feet. Use the full outer dimensions including overhang and the pallet itself, since carriers do.
Why did the carrier reclass my shipment? Carrier reweighs and re-dimensions freight; if your declared class assumed higher density than the actual lb/ft³, they bump you to a higher, costlier class. Calculating density accurately before tender prevents these corrections.
Does higher density mean cheaper freight? Generally yes for density-based commodities — the more a shipment weighs per cubic foot, the lower the class and the lower the rate per hundredweight, because it uses trailer space efficiently.

Last reviewed 2026-05-12.