US LTL freight · Density and applicability checks
Determining Freight Class Calculator
Find pounds per cubic foot for one pallet or handling unit, compare the NMFTA density scale, and check whether that scale applies to your freight.
NMFTA sources read
1. Measure one handling unit
Use the greatest outside length, width and height in inches, including projections. Weigh the entire unit in pounds, including its pallet and packaging.
2. Check the item's provisions
Unsure is a valid answer. These checks never add an invented class penalty.
3. Review the result
- Volume
- 50 ft³
- Density
- 9 lb/ft³
- Density-scale reference only
- Class 100
48 × 40 × 45 ÷ 1,728 = 50 ft³; 450 ÷ 50 = 9 lb/ft³.
Selected band: 8 to less than 10 lb/ft³. Lookup uses unrounded values; displayed numbers may be rounded.
Shipment class: not determined
The density-scale reference is conditional. Resolve these checks first:
- Confirm that dimensions and gross weight include the pallet, packaging and projections.
- Check the current NMFC item and confirm that this 13-subprovision scale applies.
- The handling assessment is unknown; verify it before using a class.
- The stowability assessment is unknown; verify it before using a class.
- The liability assessment is unknown; verify it before using a class.
Before booking or completing a bill of lading, verify the current NMFC item, subprovision, packaging requirements and any carrier tariff with ClassIT+ or your carrier. This estimate is not an official classification or a shipping quote.
Use one handling unit at a time. Do not average different pallets or commodities. Special measurement provisions, item-specific classes, NMFC codes, carrier prices and surcharges are outside this calculation.
How to determine freight class from density
NMFTA's measurement guidance uses the handling unit as offered to the carrier: maximum outside dimensions, projections and gross weight. Cubic feet = length × width × height in inches ÷ 1,728. Density = pounds ÷ cubic feet.
For NMFTA's 48 × 40 × 45 in, 450 lb example: volume is 50 ft³ and density is 9 lb/ft³. If the item uses the standard scale below, 9 lies in the 8 to less than 10 band: class 100. At 750 lb, the same volume gives 15 lb/ft³: class 70.
The calculator compares the full-precision density with the published bands. It rounds only the numbers displayed. Measurements close to a boundary deserve another check.
NMFTA 13-subprovision density scale
Source: NMFTA: Decoding Density, read . This is a conditional density comparison; an NMFC item can have different provisions.
| Density (lb/ft³) | Class |
|---|---|
| 0 to less than 1 | 400 |
| 1 to less than 2 | 300 |
| 2 to less than 4 | 250 |
| 4 to less than 6 | 175 |
| 6 to less than 8 | 125 |
| 8 to less than 10 | 100 |
| 10 to less than 12 | 92.5 |
| 12 to less than 15 | 85 |
| 15 to less than 22.5 | 70 |
| 22.5 to less than 30 | 65 |
| 30 to less than 35 | 60 |
| 35 to less than 50 | 55 |
| 50 or more | 50 |
Freight class questions
Can density alone determine my NMFC freight class?
Only when the applicable item uses that density scale and its requirements are met. NMFTA's classification FAQ explains why handling, stowability and liability still matter. The tool keeps the shipment class undetermined until you confirm the inputs and item checks; that confirmation is still your declaration, not an official lookup.
Why do fragile, non-stackable or high-value answers not increase the number?
No universal numerical adjustment for those declarations is used here. A concern or an unknown answer withholds the shipment estimate and asks for item-specific verification. The reference band remains visible so you can discuss the density calculation.
Is this the FedEx freight class calculator?
No. This is an independent ShipCost Lab tool using NMFTA's public density information. It does not access FedEx systems or reproduce a carrier's tariffs. Verify the rated class with the carrier handling your shipment.
Can I combine several pallets into one average?
This calculator handles one unit at a time. Enter each pallet or crate separately. Mixed commodities, special measurement rules and item-specific exceptions need the applicable NMFC provisions; they are not resolved by this tool.
Does the result include a shipping price or NMFC item number?
No. It returns measured volume, density, a reference band and an estimate only when your declarations permit one. It does not assign commodity codes, prices or surcharges. Check NMFTA ClassIT+ before using a class on shipping documents.
Sources and review dates
- NMFTA: Decoding Density: read .
- NMFTA: Calculating Density Best Practices: read .
- NMFTA: NMFC Classification FAQs: read .
NMFTA's update cadence is unknown. Our review interval is 30 days; it does not guarantee that an item's classification remains unchanged. Always verify the current item before shipment. Item codes and unpublished adjustments are excluded.