Freight Class Calculator
Planning Example
Class 65
Density-based estimate
Class 400lower density
22.5 to under 30 lb/ft³
Class 50higher density
Flammable Liquids LTL Shipping Guide
Freight Class for Flammable Liquids
Key Flammable Liquids Freight Facts
DOT Hazard Class 3 and LTL freight class are different systems. Hazard Class 3 describes a hazardous-material category for liquids that meet the regulatory definition; LTL freight class is a separate freight-classification question and can depend on packaged density plus other shipment characteristics.
- Hazard Class 3 is not Freight Class 3: the DOT hazard class identifies the type of transportation hazard; it does not provide the LTL freight-class number.
- Density still matters for freight planning: use the finished outside package dimensions and total packaged weight to calculate cubic feet and pounds per cubic foot.
- Packaging can change the estimate: cartons, drums, pails, overpacks, pallets, and other finished shipping units can create different cube and density results.
- Regulatory requirements are separate: this page does not determine hazard classification, packing group, packaging authorization, labeling, documentation, exceptions, or carrier acceptance.
Freight Planning Tools
Use the freight class calculator and interactive freight class chart to plan the density side of a packaged flammable-liquids shipment.
Interactive Freight Class Chart
22.5 lb/ft³Selected density
Class 400lower density
Class 50higher density
Calculate Your Freight Class
Your result
Cubic feet
44.44
Density
22.50
lb/cu ft
Estimated freight class
65
Density-based estimate for the preloaded planning example. Regulatory classification is separate.
Planning examples
Flammable Liquids Freight Class Examples
These examples show how finished package size and total packaged weight can change a density-based estimate. The dimensions and weights are illustrative planning inputs, not stated industry averages.
Planning example
Case-packed containers on a pallet
Illustrative finished pallet with cartons of liquid containers
48 × 40 × 48 in
Packaged weight: 800 lb
- Cubic feet
- 53.33
- Density
- 15.00
- lb/cu ft
Estimated class
Density-based
70
Planning example
Compact palletized liquid load
Illustrative lower-height load with a higher packaged density
48 × 40 × 36 in
Packaged weight: 900 lb
- Cubic feet
- 40.00
- Density
- 22.50
- lb/cu ft
Estimated class
Density-based
65
Planning example
Heavy palletized liquid container
Illustrative heavy finished unit with the same pallet footprint
48 × 40 × 48 in
Packaged weight: 2,200 lb
- Cubic feet
- 53.33
- Density
- 41.25
- lb/cu ft
Estimated class
Density-based
55
Two different classification systems
DOT Hazard Class 3 vs LTL Freight Class
DOT Hazard Class 3 and LTL freight class are separate classifications. A Class 3 hazardous-material designation does not mean the shipment is LTL Freight Class 3.
DOT Hazard Class 3
- Hazardous-material classification for flammable liquids that meet the regulatory definition.
- Concerned with transportation hazards and the applicable hazardous-material requirements.
- Does not by itself provide the shipment’s LTL freight-class number.
LTL Freight Class
- Used for LTL freight classification and rating.
- Density can be estimated from finished package dimensions and total packaged weight.
- Final classification can also depend on commodity provisions, handling, stowability, liability, carrier rules, and other shipment details.
Regulatory boundary: FreightClassCalculator.tools does not determine whether a specific product is regulated as Class 3, assign a packing group, select authorized packaging, determine labeling or documentation, evaluate exceptions, or determine carrier acceptance. Verify hazardous-material requirements with the shipper’s qualified compliance resources, the carrier, and official U.S. DOT / PHMSA materials.
Freight planning comparison
How the Finished Shipping Unit Changes Density
The product name alone does not determine a density-based freight class. Finished outside dimensions, pallet or overpack size, and total packaged weight can materially change pounds per cubic foot.
| Planning factor | What changes | Density effect | Freight-planning note |
|---|---|---|---|
| Taller pallet or overpack | More cubic feet at the same weight | Density decreases | Measure the maximum finished outside height, including pallet, wrap, caps, and overhang. |
| Heavier finished unit | More packaged weight in the same cube | Density increases | Use total packaged weight, not the net liquid weight by itself. |
| Added protective packaging | Cube and weight may both change | Recalculate | Re-measure the final shipping unit after any approved overpack, cushioning, palletization, or containment is added. |
| Different handling-unit format | Footprint, height, weight, and occupied space can change | Can move several tiers | Calculate the actual finished unit rather than reusing dimensions from another packaging format. |
Same weight, different cube
How Shipment Size Changes the Density Estimate
The same 1,000 lb shipment can produce a different freight-class estimate if the finished package size changes. The examples below use the same 48 × 40 in pallet footprint and vary only the shipment height.
More compact
48 × 40 × 30 in
Packaged weight: 1,000 lb
- Cubic feet
- 33.33
- Density
- 30.00
- lb/cu ft
Estimated class
Density-based
60
Reference cube
48 × 40 × 40 in
Packaged weight: 1,000 lb
- Cubic feet
- 44.44
- Density
- 22.50
- lb/cu ft
Estimated class
Density-based
65
Larger cube
48 × 40 × 60 in
Packaged weight: 1,000 lb
- Cubic feet
- 66.67
- Density
- 15.00
- lb/cu ft
Estimated class
Density-based
70
What changed?
Only the finished height changed. Weight stayed at 1,000 lb and the pallet footprint at 48 × 40 in.
30 in → Class 60
40 in → Class 65
60 in → Class 70
More package height increased cube, reduced density, and moved the estimate into a higher numerical freight class.
Freight Planning Calculators
Calculate and Plan Your Flammable Liquids Shipment
Use the freight class, density, pallet, and linear-feet calculators for the physical shipment-planning side of your LTL load.
Freight Class Calculator
Estimate freight class from packaged dimensions, weight, and density.
Freight Density Calculator
Calculate cubic feet and pounds per cubic foot for packaged freight.
Pallet Freight Calculator
Plan pallet dimensions, shipment weight, density, and configuration.
Freight Linear Feet Calculator
Estimate trailer floor space for palletized or otherwise unitized freight.
Freight classes shown on this page are density-based estimates for shipment planning. Example dimensions and weights shown on this page are illustrative planning inputs, not stated industry averages. Hazardous-material classification and compliance requirements are separate from this freight-class estimate. This page does not determine hazard class, packing group, authorized packaging, labels, documentation, exceptions, or carrier acceptance. Confirm the final freight class with your carrier or broker and verify hazardous-material requirements using qualified compliance resources and official U.S. DOT / PHMSA information. NMFC® is a registered trademark of the National Motor Freight Traffic Association, Inc. FreightClassCalculator.tools is an independent calculator and is not affiliated with, endorsed by, or licensed by NMFTA.