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Freight Density
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📦 Note: NMFC freight class is determined by the carrier based on density, stowability, handling, and liability. Density-based classification shown here is the most common method but may not match your carrier's exact class. Always confirm with your carrier or freight broker.
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What Is Freight Density and Why Does It Matter?
Freight density is a measure of how much space a shipment occupies relative to its weight — expressed in pounds per cubic foot (PCF). LTL (Less-Than-Truckload) carriers use density as the primary factor in assigning an NMFC freight class (18 classes from 50 to 500), which directly determines your shipping rate. Lower density = higher class = higher cost per pound.
Freight Density Formula
Density (PCF) = Weight (lbs) ÷ Volume (cubic feet)
Volume (ft³) = (Length × Width × Height) ÷ 1,728 × Number of Pieces
Example: 500 lbs shipment in a 48×40×48" pallet:
Volume = (48×40×48) ÷ 1,728 = 53.33 ft³ → Density = 500 ÷ 53.33 = 9.38 PCF → Freight Class 100
Example: 500 lbs shipment in a 48×40×48" pallet:
Volume = (48×40×48) ÷ 1,728 = 53.33 ft³ → Density = 500 ÷ 53.33 = 9.38 PCF → Freight Class 100
NMFC Freight Class by Density (Density-Based Items)
- Class 50: ≥ 50 PCF — very dense goods (steel, heavy machinery parts)
- Class 55: 35–50 PCF — bricks, cement, hardwood flooring
- Class 60: 30–35 PCF — car parts, motors
- Class 65: 22.5–30 PCF — bottled beverages, books
- Class 70: 15–22.5 PCF — auto engines, food items
- Class 77.5: 13.5–15 PCF — clothing, purses
- Class 85: 12–13.5 PCF — crated machinery, cast iron
- Class 92.5: 10.5–12 PCF — computers, monitors
- Class 100: 9–10.5 PCF — boat covers, canoes, wine cases
- Class 110: 8–9 PCF — cabinets, framed artwork
- Class 125: 7–8 PCF — small household appliances
- Class 150: 6–7 PCF — auto sheet metal, mattresses
- Class 175: 5–6 PCF — clothing in boxes, couches
- Class 200: 4–5 PCF — auto sheet metal parts, aircraft parts
- Class 250: 3–4 PCF — bamboo furniture, mattress/box spring sets
- Class 300: 2–3 PCF — wood cabinets, ping pong tables
- Class 400: 1–2 PCF — deer antlers, mounted fish
- Class 500: < 1 PCF — ping pong balls, gold dust
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Frequently Asked Questions
Freight density = Weight (lbs) ÷ Volume (cubic feet). To calculate volume in cubic feet: multiply Length × Width × Height in inches, then divide by 1,728 (the number of cubic inches in a cubic foot). Multiply by the number of pieces. Then divide total weight by total cubic feet. Example: 1 pallet, 48L × 40W × 48H inches, 500 lbs: Volume = 48×40×48 ÷ 1,728 = 53.33 ft³. Density = 500 ÷ 53.33 = 9.38 PCF → Class 100.
NMFC (National Motor Freight Classification) freight class is a standardized system used by LTL carriers to categorize freight and set rates. There are 18 classes: 50, 55, 60, 65, 70, 77.5, 85, 92.5, 100, 110, 125, 150, 175, 200, 250, 300, 400, and 500. Class 50 (densest/cheapest) to Class 500 (least dense/most expensive). Class is determined by four characteristics: density, stowability, handling, and liability.
Freight class directly determines your base LTL shipping rate. A shipment moving from Class 100 to Class 85 by proper packaging can reduce costs by 15%–25%. Carriers charge per 100 lbs (hundredweight) with rates varying by class and distance. Higher class = higher rate per hundredweight. Misclassifying freight can result in reclassification charges (inspect fees) at delivery — often 15%–20% of the freight bill plus correction fees.
Density-based classification uses only PCF to determine class — straightforward and predictable. Commodity-based classification assigns class based on specific NMFC item codes (lookup in NMFC tariff) that account for all four factors: density, stowability (can it be stacked/rotated?), handling (fragile? hazmat? oversized?), and liability (value, theft risk, perishability). Many commodities have fixed NMFC classes regardless of density. Always check the NMFC item code for your specific product.
Lower freight class (higher density) strategies: (1) Reduce pallet height — denser packaging increases PCF; (2) Consolidate multiple smaller shipments into one denser pallet; (3) Remove excess air/void fill from packaging where possible; (4) Use flat-rate density-based pricing programs (many carriers offer this for items over 6 PCF); (5) Ship via volume LTL (6+ pallets) instead of LTL for better rates regardless of class; (6) Consider FTL for large shipments.
Freight density (for LTL) and dimensional weight (for parcel carriers like UPS/FedEx/DHL) are related but different. Parcel dimensional weight: (L × W × H) ÷ 139 for domestic UPS/FedEx = billable weight if greater than actual weight. LTL freight density: actual weight ÷ cubic feet — determines NMFC class and rate. LTL uses density to class shipments; parcel carriers directly compare dimensional vs actual weight and charge whichever is higher.