Freight Class Calculator (NMFC Density)
Enter pallet dimensions and weight to get density in lb/ft³ and an estimated NMFC freight class on the current density scale. Handles multiple pallets.
Freight Class Calculator
Estimate a density-based freight class and a rough shipping cost from weight and dimensions. Freight class is part of the National Motor Freight Classification (NMFC); lower class numbers mean denser, easier-to-handle freight and usually lower rates.
Uses the pre-July-2025 density scale. This calculator applies the older 18-class density guideline (classes 50 to 500). NMFC Docket 2025-1, effective July 19, 2025, replaced it with a 13-tier density scale applied per handling unit, so the class shown here may not match what a carrier bills today.
Many commodities also have their own NMFC item that sets the class regardless of density. Confirm the current class for your commodity with the NMFTA or your carrier before booking.
Shipment Dimensions & Weight
An Honest Look at the Freight Class Calculator
Most freight class calculators you find online still use the old 18-class density guideline. That scale was replaced in July 2025. Using it now will give you a class number that does not match what your carrier will bill. This calculator applies the pre-2025 scale, so you can see what you would have gotten under the old rules, but you must confirm the class with the NMFTA or your carrier before booking. The real NMFC density scale, effective July 19, 2025, uses 13 subprovisions per handling unit.
- Current NMFC Density Scale: 13 subprovisions, effective July 19, 2025, per NMFTA Docket 2025-1.
- Legacy Scale (Used Here): 18 classes (50-500), pre-July-2025. No longer authoritative.
- Density Formula: Weight (lbs) ÷ Volume (cu ft). Measure per handling unit, including the pallet.
- Primary Factor: Density, but commodity-specific NMFC items can override it.
- Cost Estimate: Weight × rate per CWT only. Excludes discounts, minimums, fuel surcharges, and accessorials.
How to Use the Freight Class Calculator
Measure one handling unit at a time. A handling unit is the individual piece of freight you tender to the carrier: a pallet, a crate, a box, or a skid. If you put multiple boxes on one pallet, that full pallet is one handling unit. Measure its length, width, and height in inches, including the pallet itself. Do not subtract the pallet's dimensions from the total. Enter those numbers into the calculator, along with the total weight of that handling unit in pounds. If you have several identical handling units, enter the quantity.
For a multi-pallet shipment, calculate each pallet separately. Each handling unit gets its own density and its own class. A shipment of three pallets can have three different classes. The carrier will apply the class of each handling unit to its weight when billing. The calculator accepts one set of dimensions and a quantity, so for a mixed shipment you would run it multiple times.
Worked Example: Single Pallet
A pallet measures 48 inches long, 40 inches wide, and 48 inches high (including the pallet). It weighs 500 pounds. Volume is 48 × 40 × 48 = 92,160 cubic inches. Divide by 1728 to get 53.33 cubic feet. Density is 500 ÷ 53.33 = 9.38 lbs/cu ft. On the legacy 18-class scale, that falls into class 100. On the current 13-subprovision scale, the class may be different; confirm with the NMFTA.
Worked Example: Two Pallets
You have two identical pallets, each 48 × 40 × 48 inches and 500 pounds. The calculator treats them as two identical handling units. Total weight is 1,000 pounds, total volume is 106.66 cubic feet, density remains 9.38 lbs/cu ft. The class is still 100 on the legacy scale. But if the two pallets are not identical, you must measure and calculate each one separately.
How Density Maps to Freight Class on the Current NMFC Scale
The current NMFC density scale, effective July 19, 2025, has 13 subprovisions. Each subprovision covers a density range and assigns a single class. The NMFTA Docket 2025-1 final decision published the new breakpoints. The scale is applied per handling unit, not per shipment. The old 18-class guideline had classes from 50 to 500 with narrower bands; the new scale consolidates some ranges. For example, the old scale had separate classes for densities between 6 and 7, 7 and 8, and so on. The new scale may group several of those into one class. The exact class values for each density are published by the NMFTA in the NMFC density scale item (13-subprovision scale). Use ClassIT+ to look up the classification for your handling unit's density.
If you calculate a density of 9.38 lbs/cu ft using this calculator, you get class 100 on the legacy scale. On the current scale, the class could be different. Do not rely on the calculator's output for actual booking. Always verify with the NMFTA Help Center or your carrier.
| Class | Density Range (lbs/cu ft) | Description |
|---|---|---|
| 50 | 50+ | Very dense items (e.g., steel, bricks) |
| 55 | 35 – 50 | Dense items (e.g., cement, hardwood flooring) |
| 60 | 30 – 35 | Heavy items (e.g., car parts, granite) |
| 65 | 22.5 – 30 | Medium-heavy items (e.g., bottled beverages) |
| 70 | 15 – 22.5 | Medium items (e.g., automobile engines) |
| 77.5 | 13.5 – 15 | Medium-light items (e.g., tires) |
| 85 | 12 – 13.5 | Light items (e.g., crated machinery) |
| 92.5 | 10.5 – 12 | Lighter items (e.g., computers) |
| 100 | 9 – 10.5 | Light items (e.g., boat covers, car covers) |
| 110 | 8 – 9 | Very light items (e.g., cabinets) |
| 125 | 7 – 8 | Very light items (e.g., small household goods) |
| 150 | 6 – 7 | Ultra-light items (e.g., auto sheet metal) |
| 175 | 5 – 6 | Ultra-light items (e.g., clothing, couches) |
| 200 | 4 – 5 | Very low-density items (e.g., aircraft parts) |
| 250 | 3 – 4 | Very low-density items (e.g., bamboo furniture) |
| 300 | 2 – 3 | Extremely low-density items (e.g., wood cabinets) |
| 400 | 1 – 2 | Extremely low-density items (e.g., deer antlers) |
| 500 | Less than 1 | Lowest-density items (e.g., ping pong balls) |
When Density Is Not the Whole Answer: Commodity-Specific NMFC Items
Density is the primary factor, but it is not the only one. The NMFC assigns class per commodity item number, not per density band. Many commodities have their own NMFC item that sets the class regardless of how dense the handling unit is. For example, a high-value electronic component might have a class 150 even if its density would suggest class 100. Stowability, handling, and liability are the other three factors. You must look up the correct NMFC item for your commodity using ClassIT+ or the NMFTA's classification FAQs. If there is no specific item, the density scale applies.
This calculator gives you a density-based estimate only. It cannot know your commodity's NMFC item. If you rely solely on the calculator's class output, you risk a reclass charge from the carrier. The carrier has the right to reweigh and inspect your shipment per NMFC rules. Always verify the class for your specific commodity.
What the Cost Estimate Does and Doesn't Include
The calculator shows a rough cost based on weight times the rate per CWT you enter. That is only the base CWT charge. Real LTL pricing includes several other components: discounts off the CzarLite base rate, minimum charges, fuel surcharges, and accessorial fees for services like liftgate, residential delivery, or inside delivery. Each carrier's rules tariff defines these charges. The calculator's estimate does not include any of them.
Use the cost number as a rough order-of-magnitude check, not as a quote. A real LTL quote from a carrier or 3PL will apply your negotiated discount and add all accessorials. If the calculator shows a very low number, the actual charge may be higher due to minimums. If it shows a high number, discounts may bring it down. Always get a live quote before booking.
Common Questions
How many freight classes are there now?
The current NMFC density scale, effective July 19, 2025, has 13 subprovisions. The old 18-class guideline (50-500) is no longer authoritative. The NMFTA Docket 2025-1 final decision published the new scale. Always check the current NMFC density scale item for the exact class values.
Do I include the pallet in my measurements?
Yes. The handling unit includes the pallet. Measure its length, width, and height including the pallet. Do not subtract the pallet's dimensions. The carrier will measure the entire handling unit, and density is calculated on that total volume.
What is the difference between freight class and NMFC number?
Freight class is the numeric code (50-500 on the legacy scale, or the current 13-subprovision classes) that determines the rate. An NMFC number (or item) is a specific identifier for a commodity, like a part number. Multiple commodities can share the same class. The NMFC item is what you look up to find the correct class for your commodity.
What is reclass risk and how do I avoid it?
Reclass risk is the chance that a carrier will change the class you declared after pickup, often resulting in a higher charge. It happens when your density calculation is wrong, you used the wrong NMFC item, or the carrier reweighs and finds different dimensions. To avoid it, measure accurately per handling unit, include the pallet, use the current NMFC density scale, and verify your commodity's NMFC item. If you are reclassified, you can challenge it by requesting a reweigh and providing your own measurements and NMFC item number.
Does this calculator use the current NMFC scale?
No. This calculator uses the pre-July-2025 18-class density guideline. It shows what your class would have been under the old rules. The current NMFC density scale (13 subprovisions) is applied per handling unit and may give a different class. Always confirm with the NMFTA or your carrier before booking.
