NMFC Freight Class Calculator
Use shipment dimensions and weight to estimate density-based freight class, plus a practical NMFC lookup hint.
What this NMFC number calculator does
This tool estimates your NMFC freight class from density. In LTL shipping, density is one of the most common ways to classify freight, especially for goods without strict commodity exceptions. You enter your dimensions, handling unit count, and total weight; the calculator returns cubic feet, pounds per cubic foot, and an estimated class.
It also gives a practical NMFC lookup hint based on commodity type. That hint helps you narrow your search, but it is not a legal tariff determination by itself.
NMFC number vs freight class (quick clarification)
NMFC number
The NMFC item number is a commodity listing reference from the National Motor Freight Classification system. It describes what the product is and how it should be classified.
Freight class
Freight class (50 to 500) is the rating outcome used for pricing. A shipment might be density-based, commodity-based, or exception-based depending on the exact listing.
Why people search for an “NMFC number calculator”
Most shippers are really trying to estimate shipping class quickly. That is exactly what this calculator is built for: a fast density estimate plus commodity guidance.
Density-to-class reference chart
| Density (lb/ft³) | Estimated Freight Class |
|---|---|
| 50 or greater | Class 50 |
| 35 to less than 50 | Class 55 |
| 30 to less than 35 | Class 60 |
| 22.5 to less than 30 | Class 65 |
| 15 to less than 22.5 | Class 70 |
| 13.5 to less than 15 | Class 77.5 |
| 12 to less than 13.5 | Class 85 |
| 10.5 to less than 12 | Class 92.5 |
| 9 to less than 10.5 | Class 100 |
| 8 to less than 9 | Class 110 |
| 7 to less than 8 | Class 125 |
| 6 to less than 7 | Class 150 |
| 5 to less than 6 | Class 175 |
| 4 to less than 5 | Class 200 |
| 3 to less than 4 | Class 250 |
| 2 to less than 3 | Class 300 |
| 1 to less than 2 | Class 400 |
| Less than 1 | Class 500 |
How to use the calculator correctly
- Measure shipping dimensions as packaged and ready to move.
- Use total shipment weight in pounds or kilograms.
- Count all handling units (pallets, crates, large cartons).
- Do not mix guessed and real values; small errors can move you into a different class.
- Confirm final class with your carrier, broker, or current NMFC directory listing.
Ways to improve your freight class outcome
1) Increase density
Better palletization and tighter packaging can reduce cubic volume and improve density.
2) Use stackable packaging when possible
Better stowability can reduce accessorial issues and improve handling outcomes.
3) Describe goods accurately on the BOL
Commodity description errors trigger reclassification, rebills, and avoidable delays.
4) Re-check dimensions after wrapping
Stretch wrap, overhang, and pallet height changes can alter cubic footage more than expected.
Frequently asked questions
Can this calculator give me an official NMFC number?
No. It provides an estimate and lookup direction. Official classification still requires the correct NMFC listing and current tariff rules.
Is density always the deciding factor?
Not always. Some commodities have fixed classes or special rules tied to liability, handling, or packaging.
What if my carrier assigns a different class?
That can happen if your shipment has commodity exceptions, dimensions differ from tendered values, or packing conditions changed. Keep photos, scale tickets, and measurement records.