Freight Class Density Calculator

Check shipment measurements

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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 }}

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Less-than-truckload pricing can change sharply when a shipment takes up more trailer space than its scale weight suggests. A dense pallet of machine parts may be easy to rate, while a tall stack of light cartons can occupy the same footprint, use more cube per pound, and land in a higher numeric freight class.

Freight density is measured in pounds per cubic foot, usually shortened to PCF. The weight is the gross packed weight, and the cube comes from the greatest outside length, width, and height of the handling unit as tendered to the carrier. Pallets, skids, crates, dunnage, straps, top caps, and carton overhang belong in the measurement when they will travel with the freight.

Diagram of packed freight dimensions and gross weight used for density.

Several terms matter before a density class estimate is trusted. A handling unit is the pallet, skid, crate, carton group, or other piece moved as one unit. As tendered means the freight in the condition handed to the carrier. Cube is occupied volume. NMFC refers to the National Motor Freight Classification system that connects commodity descriptions with class rules.

Common freight density measurement mistakes and consequences
Mistake	Why it can change class confidence
Using product-only dimensions	Pallets, crates, overhang, and dunnage can add cube that lowers PCF.
Entering net product weight	Gross packed weight is the density numerator, so missing packaging weight can understate PCF.
Combining unlike pieces too early	A mixed pallet can hide one tall, light, fragile, or high-liability line that needs separate review.
Ignoring stackability	Do-not-stack freight may use trailer space differently even when density math is correct.

Density is one transportation characteristic, not the whole classification. NMFC class also considers handling, stowability, and liability. Hazardous materials, fragile goods, high-value cargo, odd shapes, minimum packaging rules, and mixed commodities can move a shipment away from a density-only estimate.

A density estimate is most useful before a quote, bill of lading, or carrier review. It shows whether measurements are plausible, whether a shipment is close to a class break, and where packaging or commodity evidence should be checked before the class is treated as reliable.

How to Use This Tool:

Measure the freight the way it will be handed to the carrier, then choose the input path that matches the shipment layout.

Choose Shipment preset as a starting point, then replace the example dimensions, weight, handling profile, and value fields with your measured freight.
Select Class table. Use NMFTA density guideline profile for a general density estimate, or 2025 density-item standard ranges only when the commodity item points to that density structure.
The class table changes the density-to-class boundary, not the measured PCF value.
Set Unit system before entering measurements. Metric entries are converted to pounds and inches because the class tables use PCF.
Pick Identical handling units when each piece has the same outside dimensions. Pick Mixed unit line worksheet when unlike pieces share a shipment; each line needs quantity, length, width, height, total weight, and an optional label.
Enter gross packed weight and greatest outside dimensions. Keep Measurements include pallet and packaging on unless you are deliberately modeling an unpacked commodity.
If length, width, height, weight, dimensional factor, or mixed worksheet rows are invalid, Check shipment measurements appears and the result waits for corrected values.
Use Freight characteristics, Stacking profile, Dimension rounding, NMFC item status, Dimensional factor, Boundary caution margin, and Declared value per pound to expose quote risks.
Review Shipment Worksheet first, then use Handling Unit Ledger, Class Boundary Table, Quote Warning Checks, Density Gauge, and JSON for deeper review.

Interpreting Results:

Freight density is the central value. It divides actual gross weight by total cubic feet and reports PCF. Estimated density class applies the selected class table to that PCF value, so denser shipments generally move toward lower numeric classes.

Stable band means the PCF value is farther from the nearest class break than the selected caution margin. Boundary risk means a small change in height, width, length, or weight could move the shipment into an adjacent density class. That warning is a remeasurement prompt, not proof that another class applies.

Freight density result cues and review actions
Output cue	How to read it	What to check next
Shipment Worksheet	Shipment density, estimated class, cube, actual weight, dimensional weight, and declared-value screen.	Confirm the measurements are packed outside measurements.
Handling Unit Ledger	Each line's cube, density, and line class before the shipment total is interpreted.	Look for one line that is taller, lighter, more fragile, or harder to classify than the others.
Class Boundary Table	The current class band, adjacent class breaks, and PCF gap to the nearest relevant boundary.	Remeasure when the boundary gap is inside your caution margin.
Quote Warning Checks	Packaging, NMFC status, stackability, declared value, oversize, and chargeable-weight concerns.	Treat warning rows as quote review tasks before sending the class to a carrier.
Density Gauge	A visual position of the current PCF value against the selected class bands.	Use it to see how far the shipment is from a denser or lighter class band.

A density class estimate does not confirm the official NMFC item, contract tariff, carrier rule, accessorial charge, or classification ruling. Keep measurements, photos, and item evidence with the quote when the shipment is near a class break or has handling caveats.

Technical Details:

Freight density starts with occupied cube. The greatest straight-line length, width, and height are multiplied in cubic inches and divided by 1,728 to convert to cubic feet. For identical handling units, the unit cube is multiplied by the handling-unit count. In mixed mode, each valid line contributes its own quantity, dimensions, and total weight before the shipment totals are summed.

The class lookup uses density floors. A PCF value at or above a row's lower bound is placed in that class until it reaches the next denser row. Under the general guideline profile, 15.00 PCF is included in Class 70, while 14.99 PCF falls into the next lighter band.

Formula Core:

Density uses actual packed weight and occupied cube. Dimensional weight is a separate quote screen and does not change PCF.

\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 after the selected rounding mode, N is handling-unit count, W_gross is gross shipment weight in pounds, D is density in PCF, and F is the dimensional factor in cubic inches per pound. Metric entries are converted before these equations are applied.

For one 48 in x 40 in x 36 in pallet weighing 850 lb, cube is 69,120 in3, or 40.00 ft3. Density is 850 / 40.00 = 21.25 PCF. Under the general guideline profile, that value is at least 15 PCF and less than 22.5 PCF, so the density-only estimate is Class 70.

Class Table Rules:

General freight density guideline class boundaries
Class	Lower PCF	Upper PCF	Boundary rule
50	50	No upper bound	PCF ≥ 50.
55	35	< 50	35 ≤ PCF < 50.
60	30	< 35	30 ≤ PCF < 35.
65	22.5	< 30	22.5 ≤ PCF < 30.
70	15	< 22.5	15 ≤ PCF < 22.5.
77.5	13.5	< 15	13.5 ≤ PCF < 15.
85	12	< 13.5	12 ≤ PCF < 13.5.
92.5	10.5	< 12	10.5 ≤ PCF < 12.
100	9	< 10.5	9 ≤ PCF < 10.5.
110	8	< 9	8 ≤ PCF < 9.
125	7	< 8	7 ≤ PCF < 8.
150	6	< 7	6 ≤ PCF < 7.
175	5	< 6	5 ≤ PCF < 6.
200	4	< 5	4 ≤ PCF < 5.
250	3	< 4	3 ≤ PCF < 4.
300	2	< 3	2 ≤ PCF < 3.
400	1	< 2	1 ≤ PCF < 2.
500	0	< 1	0 ≤ PCF < 1.

Freight density model boundaries and quote checks
Area	How it is handled	Limit
2025 density-item ranges	Uses 13 density bands: 50, 55, 60, 65, 70, 85, 92.5, 100, 125, 175, 250, 300, and 400.	Use only when the commodity item points to the 13-subprovision density structure.
Boundary risk	Compares the calculated PCF value with the current band floor and the next denser floor.	The margin is a warning distance, not another class rule.
Dimensional weight	Divides occupied cubic inches by the entered dimensional factor and compares that result with actual gross weight.	Can affect chargeable-weight review, but it does not change freight density or the selected class band.
Quote warnings	Flags missing packaging, unverified NMFC item status, limited stacking, oversize cues, high declared value, and chargeable-weight concerns.	These are review prompts, not carrier approvals or official classifications.

Accuracy Notes:

Freight density arithmetic is deterministic, but freight classification is not settled by arithmetic alone. Official class can depend on the exact NMFC item and sub, commodity description, minimum packaging requirements, carrier tariff, contract language, hazardous status, stowability, handling, liability, and mixed-commodity rules.

Use conservative outside measurements when a pallet is irregular, compressed, strapped, bowed, or likely to be dimensioned by the carrier. When the result is near a class break, keep a second measurement, weight ticket, photo, or quote note with the shipment record.

Advanced Tips:

Use Round each dimension up to next inch when a carrier or internal quoting process rounds outside dimensions conservatively.
Keep Boundary caution margin tight for normal quotes and wider for irregular freight that may measure differently at pickup.
Use Mixed unit line worksheet when unlike units share a shipment. A shipment-level PCF can hide a line that needs separate commodity or class review.
Set NMFC item status honestly. A matched density item or carrier-confirmed path carries more confidence than a density estimate without item evidence.
Review Declared value per pound and Stacking profile before trusting a density-only class for fragile, theft-sensitive, or do-not-stack freight.

Worked Examples:

Dense machinery pallet

A 48 in x 40 in x 36 in pallet weighing 850 lb occupies 40.00 ft3 and has a density of 21.25 PCF. The general guideline profile estimates Class 70. Check the Shipment Worksheet for packaging inclusion and NMFC status before using the class on a quote.

Boundary case near a lighter class

A 48 in x 40 in x 48 in handling unit weighing 500 lb occupies about 53.33 ft3 and has a density of 9.38 PCF. Under the general profile it lands in Class 100, but it is only 0.38 PCF above the 9 PCF floor. With a 0.5 PCF margin, Boundary risk tells you to remeasure before treating the estimate as stable.

Mixed quote worksheet

One 850 lb machinery pallet and two taller retail carton units are entered as separate lines. Handling Unit Ledger shows each line's cube, density, and line class, while shipment density uses total gross weight divided by total cube across all valid lines.

Invalid mixed line

If mixed mode stops showing results, check the worksheet format first. Each usable line needs a positive quantity, length, width, height, and total weight. A missing weight, zero dimension, or header in the wrong order triggers Check shipment measurements until the row is corrected.

FAQ:

Is freight class the same as density?

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

Should I calculate by pallet or by total shipment?

Use identical-unit mode when the shipment is one repeated measured unit. Use the mixed worksheet when pieces have different dimensions or weights. Carrier and NMFC rules may still require item-specific review, especially for mixed commodities.

Why does packaging change the result?

Density is based on freight as tendered. Pallets, crates, overhang, straps, top caps, and dunnage can increase outside cube or gross weight, which can move the PCF value toward a different class band.

Why is there a dimensional-weight value?

Dimensional weight helps flag quote workflows where trailer space may drive a chargeable-weight comparison. It is separate from the density class estimate and does not replace the NMFC class check.

Why did the result ask me to check measurements?

One or more required values is missing, zero, negative, or invalid for the selected mode. In mixed mode, every usable row needs quantity, length, width, height, and total weight.

Glossary:

PCF: Pounds per cubic foot, the gross packed weight divided by occupied cubic feet.
Handling unit: A pallet, skid, crate, carton group, or other piece measured and moved as one unit.
Cube: The volume from outside length, width, and height, converted from cubic inches to cubic feet.
As tendered: The condition of the freight when handed to the carrier, including packaging and projections.
NMFC: National Motor Freight Classification, the commodity classification system used for many LTL shipments.
Stowability: How effectively freight can be loaded, stacked, tiered, or placed with other freight.
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, March 16, 2026.
Classification, NMFTA.
Classification FAQ: What factors determine NMFC codes?, NMFTA Help Center, March 16, 2026.
How Carriers Can Prepare for the 2025 NMFC Changes, NMFTA, April 14, 2025.
2025 NMFC Changes Frequently Asked Questions, NMFTA.