How to Choose the Right Freight Class for Your Shipment

Proload Team·January 28, 2026·7 min read

What Is Freight Class?

NMFC freight class is a standardized classification system (50 through 500) that LTL carriers use to price shipments. Lower class numbers mean denser, easier-to-handle freight — and lower rates.

The Four Factors That Determine Class

**Density** — Weight per cubic foot. Denser = lower class.

**Stowability** — How easily it fits with other freight. Odd-shaped = higher class.

**Handling** — How difficult to load/unload. Fragile = higher class.

**Liability** — Risk of damage or theft. High-value = higher class.

Common Class Mistakes

The most expensive mistake: using a generic class when a commodity-specific class is lower. For example, many shippers classify plastic parts as Class 85 by default — but NMFC may classify their specific product as Class 65.

How to Find Your Class

Use your product's NMFC code (search the NMFC directory or ask your broker).

Calculate density: weight ÷ cubic feet. Use the NMFC density chart to get an initial estimate.

Ask your Proload account manager — we classify thousands of commodities and can often find a lower legitimate class.

Reclassification Risk

If you use a class that's lower than your freight's actual class, the carrier can reclassify on delivery and bill the difference — often with a penalty. Always use the correct class from the start.

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