How is freight class calculated?

Freight class is based primarily on density — weight divided by cubic feet. Divide your shipment's weight (lbs) by its volume (length × width × height in inches, divided by 1728). Denser freight gets a lower, cheaper NMFC class; light, bulky freight gets a higher class.

What is NMFC freight class?

NMFC freight class is a standardized rating from 50 to 500 used to price LTL freight, based on density, stowability, handling, and liability. There are 18 classes; lower classes cost less to ship.

Why does freight class matter for LTL pricing?

LTL carriers price by freight class and weight. A wrong class can cause a reclassification fee on your invoice. Calculating class correctly up front ensures your quote matches your final bill.

Freight Class Calculator

Estimate your NMFC freight class from weight and dimensions using density — the same method we use to rate LTL shipments.

Enter your shipment

Length (in)

Width (in)

Height (in)

Total weight (lbs)

Pieces / pallets

Enter all dimensions and weight to see your estimated freight class.

This is a density-based estimate. Final NMFC class can also depend on commodity, stowability, handling, and liability — our freight team verifies it before dispatch.

Get a Real Freight Quote

How freight class is calculated

NMFC freight class (50–500) is driven primarily by density — how many pounds your freight weighs per cubic foot. Calculate volume as length × width × height (in inches) ÷ 1,728 to get cubic feet, then divide weight by that volume. Denser freight earns a lower, cheaper class; light, bulky freight earns a higher class.

Density (lb/ft³)	Approx. class
30+	60
22.5 – 30	65
15 – 22.5	70
12 – 15	77.5
10 – 12	85
8 – 10	92.5
6 – 8	100
4 – 6	125
2 – 4	150
Under 2	175+

Shipping LTL freight?

Learn how LTL pricing, freight class, and accessorials work.

LTL Freight Guide