Freight Class Calculator
Calculate freight class (NMFC class) based on density. Freight class determines shipping rates for LTL (Less-Than-Truckload) shipments.
How to Use This Calculator
- Enter the weight of your shipment.
- Enter the length, width, and height dimensions.
- Select weight unit (lbs or kg) and dimension unit (inches, cm, or meters).
- The calculator displays freight class, density, and volume.
- Use this to estimate shipping costs and ensure correct classification.
Freight Class Formula
Freight class is determined by density:
Volume = Length × Width × Height (in cubic feet)
Freight Class = Based on density ranges
Example: 100 lbs, 48" × 40" × 36": Volume = (48 × 40 × 36) / 1728 = 40 ft³. Density = 100 / 40 = 2.5 lbs/ft³. This corresponds to Class 300 (2-3 lbs/ft³ range). Note: Other factors (value, handling) can affect class, but density is primary.
Full Description
Freight class (also called NMFC class) is a classification system used in LTL (Less-Than-Truckload) shipping to determine shipping rates. It ranges from Class 50 (dense, heavy items) to Class 500 (very lightweight items). Freight class is primarily based on density (weight per cubic foot), but other factors like value, handling requirements, and liability can also affect classification.
Lower freight class numbers (50-70) typically indicate dense, heavy items that are cost-effective to ship. Higher class numbers (200-500) indicate lightweight, bulky items that take up more space relative to their weight. Shipping rates are calculated based on freight class and weight, with lower classes generally costing less per hundredweight (CWT). Accurate classification is important to ensure correct pricing and avoid reclassification fees.
This calculator helps you determine freight class based on density. Enter weight and dimensions, and it calculates density, volume, and freight class. Use it to estimate shipping costs, ensure correct classification, or understand how density affects freight class. Remember that carriers may reclassify shipments, so verify with your carrier for final classification.
Frequently Asked Questions
What is freight class?
Freight class (NMFC class) is a classification system used for LTL (Less-Than-Truckload) shipping. It ranges from 50 (dense, heavy items) to 500 (very lightweight items). Freight class determines shipping rates—lower class numbers typically cost less to ship.
How is freight class determined?
Freight class is primarily based on density (weight per cubic foot). Higher density = lower class number. Class 50: ≥50 lbs/ft³. Class 500: <1 lbs/ft³. Other factors (value, handling, liability) can also affect class, but density is the primary factor.
What are common freight classes?
Class 50: Dense items (machinery, metal). Class 60-70: Moderate weight items. Class 85-100: Lightweight items. Class 150-200: Very lightweight items. Class 250-500: Extremely lightweight items. Most items fall between Class 60-150.
Why does freight class matter?
Freight class directly affects shipping costs. Lower class numbers (50-70) typically cost less per hundredweight (CWT). Higher class numbers (200-500) cost more. Accurate classification ensures correct pricing and avoids reclassification fees.