Freight Class Calculator
Estimate LTL freight density and the corresponding class on NMFTA’s current 13-subprovision full-density scale. Enter the shipment’s weight, number of identical handling units, and greatest outer dimensions as tendered. The result is a density-based estimate only; the correct NMFC item, handling, stowability, liability, carrier tariffs, and other rules can affect the actual classification.
Density is shipment weight divided by cubic feet. For a handling unit measured in inches, cubage is greatest length × greatest width × greatest height ÷ 1,728. This calculator then maps density to NMFTA’s current 13-band full-density scale, which took effect with the major July 19, 2025 NMFC changes for applicable commodities.
Weight ÷ (L × W × H ÷ 1728) = lbs/cu ftInteractive step-by-step proof
- Enter values above to see the calculation unfold step by step.
Estimate LTL Density Before Checking the NMFC Item
Use the current density bands
The calculator uses NMFTA’s 13-subprovision full-density scale: less than 1 PCF maps to Class 400 and 50 PCF or more maps to Class 50, with 11 bands between them.
Measure the handling unit as shipped
NMFTA defines cubage from the greatest straight-line length, width and height, including projections, as the handling unit is tendered to the carrier.
Separate density from official classification
Density is central to the modern NMFC, but handling, stowability and liability remain classification characteristics. The correct NMFC item still matters.
Check carrier-specific rules
NMFTA describes the NMFC as a voluntary industry standard. A carrier’s published tariff or other applicable rules can affect rating and classification.
How the Freight Density Estimate Is Calculated
The arithmetic follows NMFTA’s published density method and current full-density class bands.
Step 1 — determine cubage
For each identical handling unit, multiply greatest length × width × height in inches and divide by 1,728 to convert cubic inches to cubic feet.
Step 2 — calculate density
Multiply weight and cubage by the number of identical units, then divide total weight by total cubic feet. When all units are identical, unit count does not change density.
Step 3 — map to the 13-band scale
The current full-density scale uses Class 400, 300, 250, 175, 125, 100, 92.5, 85, 70, 65, 60, 55 and 50.
Step 4 — verify the commodity
The density result is not enough to identify the authoritative class for every commodity. Check the applicable NMFC item and any handling, stowability or liability provisions.
Freight Density and Class Examples
These examples use the current NMFTA 13-band full-density scale. They are density-based estimates, not commodity-specific NMFC determinations.
500 lb pallet, 48 × 40 × 48 in
Takeaway: this example remains Class 100 under the current full-density scale.
50 identical 2 lb boxes, 12 × 12 × 12 in
Takeaway: under the current scale, exactly 2.00 PCF falls in the 2 to <4 PCF band, Class 250—not Class 300.
900 lb handling unit, 36 × 36 × 36 in
Takeaway: confirm the actual commodity’s NMFC item before using this estimate for a shipment.
Freight Density Mistakes to Avoid
Using an old pre-July-2025 density table
NMFTA’s major changes took effect July 19, 2025. The standardized full-density structure now uses 13 bands, so older 18-class density lookup tables can return different answers.
Measuring only the product
Use the greatest straight-line dimensions of the handling unit as tendered, including projections and the shipping configuration.
Treating density as the official class for every commodity
Handling, stowability and liability can matter, and the applicable NMFC item must still be identified.
Entering non-identical units as if they were identical
This calculator’s unit-count field assumes each unit has the same weight and dimensions. Mixed handling units should be cubed and weighed separately before totals are combined.
Ignoring carrier tariffs
NMFTA describes NMFC as a voluntary standard. Carrier-specific published tariffs or other applicable rules can affect how a shipment is rated.
Freight Class Calculator FAQ
What density scale does this calculator use?
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Is density the only factor in NMFC classification?
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How should I measure a pallet or handling unit?
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Why can an old freight calculator give a different class?
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Does multiplying identical units change density?
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Is the calculator’s result an official freight class?
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Freight Density & NMFC References
About This Calculator
Built and maintained by Umer Farooq, founder and developer of CalcsDone. The calculator exposes the density formula, current lookup bands, worked examples and source links so the method can be checked independently. See the CalcsDone Methodology or contact us if you spot an issue.