US LTL class
Class 100
Estimated from actual packaged density on the 13-tier scale.
Calculator
US LTL Freight Class Calculator
Estimate US LTL freight class from actual packaged density and optionally compare actual, dimensional, and chargeable weight.
- freight class
- ltl freight
- nmfc class
- density calculator
- shipping class
Length of one packaged unit in inches.
Width of one packaged unit in inches.
Height of one packaged unit in inches.
Actual packaged weight of one unit in pounds.
Number of matching packaged units.
Freight class always uses actual packaged weight. Turn on this optional comparison to estimate a separate pricing weight.
Status: initial
Results
Awaiting calculation
Keep freight class and pricing weight separate
Freight class uses actual packaged density. The optional dimensional-weight comparison is a separate planning aid for carrier pricing.
Actual packaged weight
500 lb
This weight—not dimensional weight—is used to calculate freight density.
Select Compare actual and dimensional weight in the calculator to add a carrier-divisor comparison and estimated chargeable weight.
Very lowLowMediumDenseVery dense
Commodity, handling, stowability, liability, carrier tariffs, and inspection can override a density-only estimate.
Introduction
The US LTL Freight Class Calculator estimates density-based National Motor Freight Classification (NMFC) class from packaged dimensions, actual weight, and quantity using the current 13-tier density scale for qualifying freight. It can also compare actual and dimensional weight as a separate pricing aid.
What is freight class?
Freight class is a United States less-than-truckload shipping category used to help price and handle freight. Density is a major input, but final NMFC classification can also depend on commodity, handling, stowability, liability, packaging, NMFC item notes, and carrier inspection.
Freight class method
The calculator converts packaged inches to cubic feet, multiplies by quantity, divides total actual shipment weight by total cubic feet, and maps pounds per cubic foot to the US LTL 13-tier density class scale. If requested, it separately calculates dimensional and estimated chargeable weight without changing the density-based class.
Variable explanations
Understand what each input and result means before calculating.
Length
The longest side of one packaged freight unit.
Width
The width of one packaged freight unit.
Height
The packaged height, including pallet or crate height if applicable.
Weight
The actual packaged weight of one unit in pounds.
Quantity
How many identical packaged units are included in the shipment.
Weight pricing comparison
An optional comparison of shipment actual weight with dimensional weight. It does not change the freight class.
Dimensional-weight divisor
A carrier- and rate-specific number used to convert packaged cubic inches into an estimated pricing weight.
Density
Total shipment pounds divided by total cubic feet.
Estimated freight class
The density-based class bracket before commodity-specific confirmation.
Reviewed by the Calculator.org.in Editorial Team
Formula behavior, validation cases, explanatory examples, and cited sources are checked before publication. This review supports educational accuracy and is not a substitute for qualified professional advice.
Last reviewed: 2026-08-24
Formula guide
See the calculation logic, variable definitions, and practical meaning.
Cubic feet per piece
Cubic feet = length x width x height / 1,728
- Length, width, and height are measured in inches.
Divide cubic inches by 1,728 because one cubic foot equals 1,728 cubic inches.
Total cubic feet
Total cubic feet = cubic feet per piece x quantity
- Quantity should be identical packaged units.
Use separate calculations when pallets or crates have different dimensions.
Total weight
Total weight = weight per unit x quantity
- Weight should include packaging, pallet, crate, and wrap.
Use actual packaged weight for the density estimate.
Density
Density = total weight / total cubic feet
- Weight is measured in pounds and volume in cubic feet.
Higher density usually maps to a lower freight class.
Estimated class
Class = 13-tier density bracket
- Density brackets apply to qualifying density-rated freight.
Use this as a planning estimate and confirm final classification before shipping.
Measurement rule
Measure the farthest packaged points
- Include pallet height, crate, wrap, bulges, and overhang.
Carrier inspections often measure the full handling unit, not just the product.
Reclassification check
Final class = density plus NMFC rules when applicable
- Commodity, handling, stowability, and liability may matter.
Density-only output is not a substitute for NMFC item classification.
Optional dimensional weight
Dimensional weight = length x width x height / carrier divisor
- Dimensions are in inches and the divisor must come from the applicable carrier rate.
This is a pricing comparison only. It does not replace actual packaged weight in the freight-density calculation.
Estimated chargeable weight
Chargeable weight = greater of actual weight and dimensional weight
- Carrier rounding, minimums, cubic-capacity rules, and divisors can differ.
Confirm the billable weight on the carrier quote before booking.
Worked examples
Follow realistic inputs through the calculation step by step.
1
Worked example
Single pallet example
- 1A 48 x 40 x 48 inch pallet has 53.33 cubic feet.
- 2At 500 lb, density is 9.38 lb/ft3.
- 3The 13-tier density estimate maps to freight class 100.
2
Worked example
Two identical units
- 1Two 36 x 36 x 36 inch crates have 54 cubic feet total.
- 2At 300 lb each, total weight is 600 lb.
- 3Density is 11.11 lb/ft3, mapping to class 92.5.
3
Worked example
Light bulky freight
- 1A 60 x 48 x 72 inch shipment has 120 cubic feet.
- 2At 250 lb, density is 2.08 lb/ft3.
- 3The estimate maps to class 250 on the 13-tier density scale because the shipment is bulky for its weight.
4
Worked example
Dense freight example
- 1A shipment at 36 lb/ft3 falls in the 35 to under 50 lb/ft3 bracket.
- 2The density-based estimate is class 55.
- 3At 50 lb/ft3 or more, qualifying density-rated freight maps to class 50.
5
Worked example
Optional chargeable-weight comparison
- 1A 48 x 40 x 48 inch pallet contains 92,160 cubic inches.
- 2Using an example divisor of 139 gives about 663.02 lb of dimensional weight.
- 3If actual weight is 500 lb, the optional comparison selects 663.02 lb; class 100 still comes from the 500 lb actual-weight density.
Common mistakes
Avoid these common input and interpretation errors.
Using product dimensions instead of packaged dimensions
Measure the full shipping unit, including pallet, crate, wrapping, bulges, or overhang.
Ignoring commodity rules
Density does not always determine the final NMFC class.
Forgetting quantity
Total density should use the full shipment volume and weight when units are identical.
Combining unlike pallets
Different pallet sizes or weights should be calculated separately or from exact shipment totals.
Rounding too aggressively
Small measurement changes can shift density near a class boundary.
Assuming class 500 from old density charts
Many current density-only references use the 13-tier scale where less than 1 lb/ft3 maps to class 400, while commodity-specific classes may still differ.
Booking without confirmation
Incorrect class can lead to reclassification, adjusted charges, or disputes after inspection.
Using dimensional weight to calculate freight class
Use actual packaged weight for density-based class. Dimensional weight is shown separately as a pricing comparison.
Assuming one divisor applies everywhere
Divisors, dimension rounding, minimums, and cubic-capacity rules vary by carrier, account, service, and tariff.
Frequently asked questions
Quick answers to the questions users ask most often.
What does this Freight Class Calculator do?
It estimates LTL freight class from dimensions, weight, quantity, cubic feet, and density.
Is this the final NMFC freight class?
No. It is a density-based estimate. Confirm the final class with your carrier, broker, or NMFC classification resource.
What units does the calculator use?
It uses inches for dimensions and pounds for weight.
What is freight density?
Freight density is shipment weight divided by shipment cubic feet, usually shown as pounds per cubic foot.
Why does density matter?
Density helps carriers estimate how much trailer space a shipment uses for its weight.
What is the 13-tier density scale?
It is a density-based LTL classification scale with brackets from class 400 for less than 1 lb/ft3 to class 50 for 50 lb/ft3 or more.
Can commodity type change freight class?
Yes. Commodity, liability, handling, and stowability can override a density estimate.
Should I include pallet height?
Yes. Use full packaged dimensions, including pallets and packaging.
Should I include packaging weight?
Yes. Use packaged weight, including pallet, crate, wrap, and protective material.
Should I use actual weight or dimensional weight?
For this estimate, use actual packaged weight. Carriers may apply additional rating rules.
What is LTL shipping?
LTL means less-than-truckload freight, where shipments share trailer space.
What class is dense freight?
Dense freight generally receives a lower class number than light, bulky freight.
What class is light bulky freight?
Light bulky freight often maps to a higher class because it uses more space per pound.
Can I calculate multiple pallets?
Yes. Enter dimensions and weight per matching unit, then enter the quantity.
What if my pallets are different sizes?
Calculate each size group separately or use exact shipment totals from a detailed freight worksheet.
Why did my carrier assign a different class?
The carrier may use commodity-specific NMFC rules, handling requirements, tariff rules, or inspection data.
What causes reclassification fees?
Incorrect dimensions, weight, commodity description, NMFC code, packaging, or freight class can trigger reclassification.
What is NMFC?
NMFC means National Motor Freight Classification, the classification system used for many LTL freight shipments.
What is PCF?
PCF means pounds per cubic foot, another name for freight density.
Can this calculator book freight?
No. It only estimates class for planning and comparison.
When should I contact a carrier or broker?
Contact them before booking if the shipment is fragile, hazardous, high-value, hard to stack, unusually shaped, or near a density bracket boundary.
Is this calculator specific to the United States?
Yes. The freight-class estimate is designed for the United States LTL market and the NMFC framework; other countries use different rating systems.
Does dimensional weight change the estimated freight class?
No. The class estimate uses actual packaged weight divided by packaged cubic feet. Dimensional weight is an optional, separate pricing comparison.
Which dimensional-weight divisor should I enter?
Enter the divisor stated by your carrier, broker, tariff, or negotiated rate. The default is an editable example and is not universal for US LTL freight.
References
Sources used to support the calculator guidance.
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Version history
A transparent record of calculator content updates.
- 1.2.0 · 2026-08-24
Clarified the US LTL scope and added an optional actual-versus-dimensional chargeable-weight comparison with carrier-specific caveats.
- 1.1.0 · 2026-08-03
Updated to the 13-tier density scale and added density chart, measurement checklist, reclassification risk checks, and expanded NMFC guidance.
- 1.0.0 · 2026-07-06
Initial freight class calculator release.