Freight Class Density Calculator

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Shipment preset:

Start from a common LTL quote scenario or choose Custom measured shipment.

Reference class table:

The official NMFC item can override a density-only estimate.

Measurement mode:

Mixed mode calculates shipment density from total packed weight divided by total cube.

Freight characteristics:

Choose the closest handling profile so quote checks match the freight.

Stacking profile:

Flag whether other freight can be loaded safely on top.

Pallet and packaging included:

Carrier measurements generally use the complete handling unit as tendered.

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Dimension rounding:

Rounding is applied in canonical inches before cube and density are calculated.

Dimensional-weight factor:

Used only for the chargeable-weight comparison.

in³/lb

Boundary caution margin:

Use a positive PCF margin when measurements may vary at pickup.

PCF

Declared value per pound:

Zero is neutral and means no liability value screen was supplied.

$/lb

NMFC verification status:

Status changes quote guidance, not the density calculation.

Measure	Value	Quote meaning	Copy
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Check	Status	Why it matters	Copy
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Line	Qty	Dimensions	Weight	Cube	Density	Line class	Note	Copy
{{ row.line }}	{{ row.qty }}	{{ row.dimensions }}	{{ row.weight }}	{{ row.cube }}	{{ row.density }}	{{ row.lineClass }}	{{ row.note }}

Class	Density range	Status	Gap	Copy
{{ row.classLabel }}	{{ row.range }}	{{ row.status }}	{{ row.gap }}

Less-than-truckload freight shares trailer space with other shipments, so the space occupied by a handling unit matters alongside its weight. Density expresses that relationship in pounds per cubic foot. A compact, heavy pallet has a higher density than a tall, light pallet and will often fall into a lower numeric freight class when a density-based item applies.

The measurements must describe the freight exactly as tendered to the carrier. Use the greatest straight-line length, width, and height, including the pallet, packaging, overhang, bulges, bands, and projections. Weight must also include the complete packed handling unit. Measuring only the product can understate cube and produce a class estimate that does not survive carrier inspection.

Freight density facts that affect classification review
Fact	Why it matters
Density	Screens the class range when the governing NMFC item uses density.
Handling	Fragile, awkward, or difficult freight may receive a different class.
Stowability	Non-stackable or irregular freight can consume more trailer space than its outer cube suggests.
Liability	High value, damage risk, perishability, or hazardous characteristics can override a density-only expectation.
Commodity item	The official NMFC item and sub determine which density table or special rule applies.

A density class is therefore a screening result, not a guaranteed billed class. Mixed commodities, packaging rules, carrier tariffs, accessorials, and an item's handling, stowability, or liability provisions can change the final classification. Keep the measurements and NMFC evidence with the quote or bill of lading.

How to Use This Tool:

Measure the packed shipment before choosing the reference table.

Choose a Shipment preset or start with custom measurements. Select the Reference class table only after checking which NMFC item or guideline applies.
Select Identical handling units for equal pieces, or use the mixed-line worksheet when dimensions or weights differ. Enter outside dimensions and total packed weight in the selected units.
Confirm that Measurements include pallet and packaging, then describe the freight characteristics and stacking profile. These facts do not change the density equation, but they change how safely the estimate can be used.
Review Density position and Quote checks. Remeasure near a class boundary and verify the official NMFC item before requesting or accepting a rate.

Interpreting Results:

Density is the main computed value. Estimated class is the first class row whose minimum density is less than or equal to that value. At an exact boundary, the shipment enters the denser band; for example, exactly 9.0 lb/ft³ maps to class 100 in the NMFTA guideline profile.

Treat a small Nearest boundary gap as a reason to remeasure. The dimensional-weight comparison is a separate quote aid and does not replace actual packed weight in the density formula. A stable density band also does not clear non-stackable, fragile, high-liability, mixed-commodity, or unverified-item warnings.

Technical Details:

Cubage uses the greatest outside dimensions in inches and converts cubic inches to cubic feet with the exact factor 1,728. Identical handling units multiply one unit's cube by the count. Mixed lines calculate each group separately, then divide total packed weight by the sum of all line cubes.

Formula Core:

The governing density equation and optional dimensional-weight comparison are:

\begin{matrix} V & = & \frac{L W H n}{1728} \\ ρ & = & \frac{M}{V} \\ M_{d} & = & \frac{L W H n}{d} \end{matrix}

L, W, and H are packed dimensions in inches; n is handling-unit count; V is total cubic feet; M is total packed pounds; ρ is density in pounds per cubic foot; d is the selected dimensional factor in cubic inches per pound; and M_d is dimensional weight. The comparison weight is the greater of actual and dimensional weight.

Lookup Core:

Rows are evaluated from highest minimum density downward. Each lower bound is inclusive and the next denser band's lower bound is exclusive.

NMFTA density guideline profile class boundaries
Density range (lb/ft³)	Class
50 and up	50
35 to less than 50	55
30 to less than 35	60
22.5 to less than 30	65
15 to less than 22.5	70
13.5 to less than 15	77.5
12 to less than 13.5	85
10.5 to less than 12	92.5
9 to less than 10.5	100
8 to less than 9	110
7 to less than 8	125
6 to less than 7	150
5 to less than 6	175
4 to less than 5	200
3 to less than 4	250
2 to less than 3	300
1 to less than 2	400
Less than 1	500

The separate 2025 density-item profile applies only when the commodity item points to that 13-subprovision progression.

2025 density-item standard class boundaries
Density range (lb/ft³)	Class
50 and up	50
35 to less than 50	55
30 to less than 35	60
22.5 to less than 30	65
15 to less than 22.5	70
12 to less than 15	85
10 to less than 12	92.5
8 to less than 10	100
6 to less than 8	125
4 to less than 6	175
2 to less than 4	250
1 to less than 2	300
Less than 1	400

Optional dimension rounding is applied to each dimension before cube is calculated. Inches and pounds are the canonical calculation units; centimetres and kilograms are converted first. A user-set boundary margin flags a result when its distance from the nearest class floor is less than or equal to that margin.

Accuracy Notes:

Use outside dimensions and gross weight as the freight will be tendered. The reference class remains an estimate until the correct NMFC item and sub are verified. Carrier rules, mixed commodities, packaging requirements, dimensional-weight policies, accessorials, handling, stowability, and liability may change the quote or class. Recheck current NMFTA material when classification rules change.

Worked Examples:

Dense machinery pallet

A 48 × 40 × 36 inch packed pallet occupies 40 ft³. At 850 lb, density is 21.25 lb/ft³, which screens as class 70 under the NMFTA guideline profile. The 1.25 lb/ft³ gap above the 15 lb/ft³ floor is useful evidence, but the commodity item still controls.

Mixed handling units

One machinery pallet plus two tall retail-carton pallets total 1,220 lb and 173.33 ft³. Combined density is about 7.04 lb/ft³, screening as class 125 in the guideline profile. The individual lines screen as classes 70 and 300, so the mixed-commodity and item rules need review before quoting the combined shipment.

References:

How Is the Density of a Handling Unit Calculated?, National Motor Freight Traffic Association, updated March 16, 2026.
National Motor Freight Classification Procedures, National Motor Freight Traffic Association, March 26, 2026.
2025 NMFC Changes Frequently Asked Questions, National Motor Freight Traffic Association, 2024.