Freight Class Density Calculator

Check shipment measurements

{{ error }}

Shipment preset:

Start from a common LTL quote scenario, then match your measured handling unit.

Class table:

Actual NMFC class can still change for stowability, handling, liability, or commodity-specific rules.

Unit system:

Choose the measurement units used in the form, tables, and exports.

Measurement mode:

Choose mixed lines when a shipment has unlike pieces that should be rated from total weight divided by total cube.

Mixed handling unit lines:

Format: qty, length, width, height, total weight, label. The weight is total for that line, including packaging.

Handling units:

Use a separate quote line when different pieces have different dimensions or classes.

unit(s)

Total shipment weight: {{ weightReadout }}

This is the numerator for pounds per cubic foot.

Footprint length x width:

Use the maximum outside length and width of one identical piece.

x {{ lengthUnit }}

Handling unit height: {{ heightReadout }}

Height drives cube quickly, especially near class boundaries.

Freight characteristics:

Use the closest handling profile so the warnings match the quote risk.

Stacking profile:

Flag whether other freight can be loaded on top of this handling unit.

Measurements include pallet and packaging:

Turn this off only when you are modeling commodity-only dimensions before final packing.

Dimension rounding:

Rounding changes the cube used in density and boundary checks.

NMFC item status:

Use ClassIT, carrier guidance, or a classification expert for the official item and sub.

Dimensional factor:

Leave blank only when you do not want a dimensional-weight warning.

in3/lb

Boundary caution margin:

A 0.5 PCF margin is a practical screening default for quote review.

PCF

Declared value per pound:

Used only for the liability warning row; it does not change the density estimate.

$ /lb

Metric	Value	Detail	Copy
{{ row.metric }}	{{ row.value }}	{{ row.detail }}

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 }}

Check	Status	Detail	Copy
{{ row.check }}	{{ row.status }}	{{ row.detail }}

Embed:

Customize

Include current inputs

Size

Advanced

Width

Height

Aspect ratio

Max height

Collapsible embed

Allow fullscreen

Referrer policy

Sandbox tokens

Less-than-truckload freight class is partly a space problem. A carrier has to price how much trailer cube a pallet, crate, skid, or carton consumes compared with its weight, because a light but bulky shipment can fill a trailer before the truck reaches its weight limit.

Density is the bridge between those two limits. It is measured in pounds per cubic foot, usually shortened to PCF. A dense pallet of machine parts may occupy little space for its weight and land in a lower class. A tall pallet of light retail cartons may occupy much more cube per pound and land in a higher class. The number looks simple, but it depends on the outside dimensions and gross weight as tendered to the carrier, not the product-only size before pallet, crate, straps, overhang, or top cap are included.

Class is not density alone. The National Motor Freight Classification also considers handling, stowability, and liability. Fragile, hazardous, unusually shaped, high-value, non-stackable, or mixed-class freight can move away from a density-only estimate even when the PCF math is clean.

Density estimates are still useful before a quote or bill of lading is prepared. They help catch measurement errors, show when a shipment sits near a class boundary, and make mixed handling units easier to review before a carrier, broker, or classification specialist confirms the official item and class.

How to Use This Tool:

Start with the measured shipment, then decide whether you are estimating one repeated handling unit or a mixed worksheet.

Choose a shipment preset only as a starting point. Replace the dimensions, weight, and freight profile with the values from the actual pallet, crate, carton group, or skid.
Select the class table. Use the NMFTA density guideline profile for a general density screen, or the 2025 density-item ranges only when the commodity item points to that density structure.
Set the unit system before entering measurements. Imperial entries use pounds and inches; metric entries are converted to the PCF basis used by the class tables.
Use identical handling units when each piece has the same outside length, width, height, and total shipment weight. Use the mixed line worksheet when unlike pieces share the shipment.
Include pallet, crate, dunnage, straps, carton overhang, and protective packaging unless you are intentionally modeling the commodity before final packing.
Review freight characteristics, stackability, dimension rounding, boundary margin, dimensional factor, declared value, and NMFC status before relying on the warning checks.
Read Shipment Worksheet first, then compare Handling Unit Ledger, Class Boundary Table, Quote Warning Checks, Density Gauge, and JSON when you need a reusable record.

Interpreting Results:

Freight density is the gross shipment weight divided by total cubic feet. Estimated density class applies the selected table to that density. A lower numeric class normally points to denser freight; a higher numeric class normally points to lighter or harder-to-rate freight.

Class boundary risk matters because a small dimension or weight change can move a shipment into the next class band. Round-up dimension mode and the boundary margin help show when a measurement should be rechecked before a quote is sent.

Freight density result cues and follow-up checks
Result cue	Meaning	What to verify
Stable band	The current density is farther than the selected caution margin from the nearest class boundary.	Still confirm NMFC item, packaging, stackability, and carrier rules.
Boundary risk	The density is close enough to a boundary that small measurement changes may change the estimated class.	Remeasure outside dimensions and gross weight, then compare exact and round-up modes.
Packaging missing	The measurements are marked as not including pallet or packaging.	Do not use the estimate for tendered freight until the packed dimensions and weight are known.
Dim weight higher	The dimensional-weight screen is above actual gross weight.	Carrier chargeable-weight workflows may rate differently from the density class screen.
Handling or liability caveat	The selected freight profile may require review beyond density.	Check the official item, sub, handling instructions, declared value, and carrier acceptance notes.

Treat the output as a quote and measurement screen. It is not an official classification ruling, and it cannot replace a confirmed NMFC item, carrier tariff, contract rule, or classification expert review.

Technical Details:

Density class logic starts with cube. Outside length, width, and height are multiplied in cubic inches, including projections and packaging, then divided by 1,728 to convert to cubic feet. For identical pieces, the unit cube is multiplied by the number of handling units. For mixed pieces, each line contributes its own cube and weight before the shipment-level density is calculated.

Class lookup uses threshold floors. A shipment with density at or above a threshold falls into that class band until it reaches the next denser threshold. Density tables are not a promise of official class because density may be only one transportation characteristic among several.

Formula Core:

\begin{array}{lcl} C_{ft3} & = & \frac{L \times W \times H \times N}{1728} \\ D & = & \frac{W_{gross}}{C_{ft3}} \\ W_{dim} & = & \frac{L \times W \times H \times N}{F} \end{array}

Here, L, W, and H are outside dimensions in inches, N is handling-unit count, W_gross is gross shipment weight in pounds, D is density in PCF, and F is the entered dimensional factor in cubic inches per pound.

For example, one 48 in x 40 in x 36 in pallet weighing 850 lb has 69,120 cubic inches, or 40.0 cubic feet. Density is 850 / 40.0 = 21.25 PCF. Under the general density guideline profile, that sits below 22.5 PCF and above 15 PCF, so the density-only estimate is Class 70.

Class Table Behavior:

Freight density class table behavior
Table	What it covers	Important boundary
NMFTA density guideline profile	The broader guideline scale from Class 50 through Class 500.	Includes intermediate guideline classes such as 77.5, 110, 150, 200, and 500.
2025 density-item standard ranges	A compact density-item scale used only when the commodity item points to it.	Uses 13 density ranges from Class 50 through Class 400.
Boundary margin	A user-selected PCF distance used to flag unstable estimates near a band floor.	A narrow cushion is a remeasurement cue, not an automatic class change.

Mixed-unit mode calculates each line separately for the ledger, then sums all line weights and all line cubes for the shipment-level class estimate. That makes the overall density auditable while still showing when one line looks much lighter or denser than the rest of the shipment.

Accuracy Notes:

The arithmetic is deterministic, but freight classification is not settled by arithmetic alone. Official class may depend on the exact NMFC item, commodity description, packaging, carrier rules, stowability, handling, liability, mixed commodities, density provisions, and the wording used on the bill of lading.

Use conservative measurements when the freight is irregular, compressed, strapped, or likely to be dimensioned by a carrier. If a result is close to a boundary, take a second measurement and keep the evidence with the quote or BOL.

Worked Examples:

Dense pallet estimate:

A 48 in x 40 in x 36 in pallet at 850 lb has 40.0 cubic feet and 21.25 PCF. The general guideline profile estimates Class 70. If the entered boundary margin is 0.5 PCF, the estimate is not right on the 22.5 PCF floor for Class 65, but a material height error could still matter.

Tall light retail pallet:

A 48 in x 40 in x 60 in pallet at 185 lb has about 66.67 cubic feet and 2.78 PCF. That is much lighter per cubic foot, so the density estimate moves into a high class band. Stackability and mixed retail contents should be reviewed before rating the pallet as one simple density line.

Mixed worksheet:

One dense pallet and two taller carton units are entered as separate lines. The ledger shows each line's cube, density, and line class, while the shipment worksheet uses total gross weight divided by total cube for the overall quote screen.

Packaging not included:

If the packaging switch is off, the warning checks mark the estimate as missing tendered-package measurements. Add pallet height, crate sides, overhang, and gross packed weight before using the class estimate in a quote workflow.

FAQ:

Is freight class the same as density?

No. Density is a major input for many commodities, but official class can also reflect handling, stowability, liability, packaging, and the exact NMFC item.

Should I round dimensions up?

Round-up mode is useful when carrier systems, dimensioners, or tariff rules may use conservative whole-inch dimensions. Exact mode is better for checking a measured source before applying that margin.

Why does mixed freight need a worksheet?

Different pallets or cartons can have very different densities. The worksheet keeps each line auditable while still calculating a total shipment density.

Can this replace a carrier or NMFC ruling?

No. Use it to screen measurements and class boundaries, then confirm the official commodity item, sub, class, and carrier rules before tendering freight.

Glossary:

PCF: Pounds per cubic foot, calculated from gross weight divided by occupied cubic feet.
Handling unit: A pallet, skid, crate, carton group, or other unit tendered to the carrier as one measured piece.
NMFC: National Motor Freight Classification, the classification system used for many LTL commodities.
Class boundary: The density threshold where the estimate moves from one class band to another.
Dimensional weight: A chargeable-weight screen based on occupied cube divided by a dimensional factor.

References:

How is the density of a handling unit calculated?, NMFTA Help Center.
Freight Classification Development Council Procedures, 2025, NMFTA.