Freight Class Calculator
How to use
How to Calculate Freight Class
1. Measure packaged freight
Use outside dimensions, including pallet, crate, carton, wrap, and overhang.
2. Enter weight and quantity
Use the packaged weight for each item. Add rows for different-size pallets or cartons.
3. Review the estimate
Check cubic feet, density, class range, and any special freight condition warnings.
Calculator logic
How This Freight Class Calculator Works
This tool calculates density-based LTL freight class from shipment density. It also works as a freight volume calculator because it converts packaged length, width, height, and quantity into total cubic feet before mapping the final density to a density-based freight class. Single-shipment values from the Freight Density Calculator can be transferred into this calculator, including dimensions, weight, quantity, and units.
Freight Density Formula
Freight density is total shipment weight divided by total cubic feet.
Cubic Feet From Inches
For mixed shipments, the calculator totals each item’s cubic feet and weight first, then calculates one shipment density.
Total Shipment Volume
The calculator totals shipment volume and weight first, then compares the final density against the density class scale to calculate one density-based freight class.
Need density without class mapping? Use the Freight Density Calculator.
Field Example
Freight Class Calculation Example
In this example let us consider a shipment that measures 48 × 40 × 36 inches and weighs 400 lb — that gives you 40.00 cubic feet of volume. Now we divide the weight by the volume: 400 ÷ 40.00 = 10.00 lb/cu ft, which places this shipment in Class 92.5.
Example Result
Volume
Density
Class estimate
10.00 lb/cu ft Class 92.5
Please note: This example uses one packaged shipment. For mixed shipments, the calculator totals all item volumes and weights before calculating the final density.
Calculator Results
Understand Your Freight Class Result
Freight class is a rating category used for LTL shipments. Lower density-based classes generally reflect denser freight, while higher classes generally reflect lighter or lower-density freight. The class itself is not a freight price; carriers use class along with lane, weight, accessorials, discounts, and tariff rules to rate a shipment.
| Common Result | How to Read it |
|---|---|
| Class 50 | The highest-density result on this density scale. This range starts at 50.00 lb/cu ft or greater, but final classification can still depend on NMFC item or carrier rules. |
| Class 55 | A very dense density-based result. On this calculator's scale, Class 55 covers 35 to less than 50 lb/cu ft. |
| Class 70 | A denser density-based result than mid-range freight. Class can still change when an NMFC item or carrier rule applies. |
| Class 85 or 92.5 | A middle density range where small dimension or weight changes can move the estimate into a nearby bracket. |
| Class 100 | A common mid-density estimate. On this density scale, Class 100 begins at 8.00 lb/cu ft. |
| Class 125 | A lighter density-based result than Class 100. This calculator maps 6 to less than 8 lb/cu ft to Class 125. |
| Class 175 and higher | Lower-density freight on this chart. Confirm the final class when handling, stowability, liability, hazmat, or commodity-specific rules apply. |
This table gives class context only. It does not assign official commodity classification. For the full density bracket lookup, use the Freight Density Chart.
Class vs. NMFC
Freight Class vs. NMFC Code
Freight class is the LTL rating category used when a shipment is rated. An NMFC code or item number identifies a commodity-specific classification, and that item can assign or affect the freight class even when density points to a different estimate.
Density Estimate, Not NMFC Lookup
This calculator does not look up NMFC codes or provide an official freight classification. It calculates freight class from density — so you have a working number before you pick up the phone with your carrier or broker.
Class vs. density
Freight Class vs. Freight Density
Freight density is the shipment weight divided by cubic feet. Freight class is the rating category calculated from that density when density-based class logic applies. Some freight may still require commodity-specific or carrier review.
If you need a detailed view of every density bracket, the Freight Density Chart features the full breakdown. Just need cubic feet and pounds per cubic foot? Use the Freight Density Calculator.
Classification limits
When Density Alone May Not Determine Class
Density is a major part of many LTL class estimates, but final freight class can still depend on NMFC item number, commodity, stowability, handling, liability, packaging, and carrier rules.
Important Classing Boundary
Density doesn’t tell the whole story for every shipment. Freight that’s fragile, hazardous, oddly shaped, or tied to a specific NMFC item can have its class set by factors beyond density — so use this density-based result as a planning reference and confirm the final class if any of those apply.
Measurement accuracy
Avoiding Reclassification Issues
A few inches or pounds can matter more than you'd expect. Carrier inspectors measure the full packaged shipment — pallet, wrap, crate, overhang and all — so if your dimensions don't account for that, the estimate and the final bill may not match.
Near-threshold Results Need Extra Attention
When the result is close to the next density threshold, carrier-measured dimensions or reweighed freight may move the shipment into a different class range. Confirm close results before quoting, booking, or billing.
Near-Threshold Weight Check
When a shipment lands close to the next density bracket, it's useful to know exactly how much weight separates it from crossing that line. For example, a 40.00 cu ft pallet sitting at 7.00 lb/cu ft would need 320 lb total to hit 8.00 lb/cu ft and move into the Class 100 range. The same idea works in reverse if you already know the weight and want to figure out the volume instead.
Source scope
Methodology and Source Scope
This calculator uses a density-based freight class reference scale for shipment planning. It does not reproduce the NMFC, provide official item classification, quote carrier pricing, interpret tariffs, or replace carrier, broker, NMFC, or ClassIT+ review.
Unit conversions used
- Centimeters are converted to inches by dividing by 2.54.
- Kilograms are converted to pounds by multiplying by 2.20462.
- Inch-based volume uses 1,728 cubic inches per cubic foot.
Common questions
Freight Class Calculator FAQ
Does this freight class calculator cost to use?
No. This calculator is absolutely free to use for density-based LTL freight class estimates.
Is this an official NMFC freight class?
No. This tool calculates a density-based class from freight density only. Official classification can still depend on NMFC item number, commodity, handling, stowability, liability, and carrier rules.
What is the difference between freight class and freight density?
Freight density is weight divided by cubic feet. Freight class is the rating category estimated from density. It may also depend on NMFC item number, commodity, handling, stowability, liability, packaging, and carrier rules.
Should I include the pallet in the measurements?
Yes. Use the outside packaged dimensions, including pallet, crate, carton, wrap, and overhang.
Can I use the calculator results for an LTL Bill of Lading?
You can use the result as a density-based reference, but final freight class should always be confirmed with your carrier, broker, or NMFC source before booking or billing.
What does freight class 100 vs 125 mean?
Class 100 is a denser density-based result than Class 125. In this calculator, Class 100 starts at 8 lb/cu ft, while Class 125 covers 6 to less than 8 lb/cu ft. Final class can still depend on NMFC item number, commodity, handling, stowability, liability, and carrier rules.
What is the difference between freight class and an NMFC code?
Freight class is the LTL rating category. An NMFC code or item number identifies a commodity classification and may assign or affect the class even when density points to a different estimate. This calculator is not an NMFC code lookup.