Freight Class Calculator Online

Freight Class Calculator

Enter weight and dimensions to get an instant NMFC freight class estimate, based on density — free, private, no sign-up, works for single pallets, multi-piece shipments, and reverse lookups.

Add every pallet in the shipment. The calculator sums total weight and total cubic feet to get one blended density and class, the same way carriers classify a multi-pallet shipment of one commodity.

Find the weight or dimensions needed to hit a target freight class — useful for planning how to reduce your class before you ship.

Estimate only. Density is the primary rating factor for most general commodities, but the National Motor Freight Classification also considers stowability, handling and liability. Your carrier's bill of lading and the applicable NMFC item number determine the final billed class. This tool is not affiliated with the NMFTA.

How the Freight Class Calculator Works

This freight class calculator estimates your NMFC freight class directly in your browser: enter the length, width and height of your shipment in inches and its weight in pounds, and the tool computes cubic feet, then density in pounds per cubic foot, then matches that density against the standard density-based class chart used across the LTL industry.

Step-by-step guide

  1. Measure the outer dimensions. Include the pallet, any overhang, and packaging — carriers measure the greatest points on each axis, not just the boxed product.
  2. Weigh the full shipment. Include the pallet weight itself, not just the goods, since carriers weigh the whole unit.
  3. Run the calculator. The tool converts your inputs to cubic feet, divides weight by cube to get density, and returns the matching class instantly.
  4. Compare scenarios. Use the A/B comparison to see how repacking into a smaller footprint or a shorter pallet changes your class before you book the shipment.

Practical cases

Palletized electronicsA 48×40×30 in pallet weighing 380 lbs computes to roughly 10.4 lb/ft³, landing around class 100 — worth checking before quoting a carrier.
Bulky but light furnitureA 60×40×48 in crate at only 90 lbs comes out near 1.6 lb/ft³, which falls into the 400 bracket — a common shipper surprise.
Dense machinery partsA compact 36×36×24 in crate at 900 lbs works out to roughly 43 lb/ft³, comfortably inside the class 60 bracket — the cheapest end of the chart.

Freight Density Calculator: Formula and Worked Example

The core freight density calculator formula used to determine freight class has two steps:

StepFormula
Cubic feet(Length in × Width in × Height in) ÷ 1728
DensityTotal weight in lbs ÷ Cubic feet

Worked example

A pallet measuring 48 in long, 40 in wide and 36 in high weighs 300 lbs. Cubic feet = (48 × 40 × 36) ÷ 1728 = 40 ft³. Density = 300 ÷ 40 = 7.5 lb/ft³. On the density chart below, 7.5 lb/ft³ lands in the 6–8 bracket, which maps to freight class 175. Repacking the same weight into a 30-inch-high pallet instead would raise density to about 9 lb/ft³ and drop the class to 125, typically lowering the per-hundredweight rate.

Freight Class Calculator NMFC: How Classification Works

The National Motor Freight Classification (NMFC), maintained by the National Motor Freight Traffic Association, assigns every commodity an NMFC item number and, within it, a class from 50 to 500. An NMFC class calculator like this one estimates that class from density alone, which is the dominant factor for roughly 80% of general commodities. For commodities where stowability, handling difficulty, or liability materially change the rating, the density estimate is a strong starting point but the shipper should confirm the exact NMFC item with their carrier or a classification specialist.

LTL Freight Class Calculator: Why Less-Than-Truckload Shippers Need One

In less-than-truckload (LTL) shipping, freight class is one of the biggest inputs into the quoted rate, alongside origin, destination, and accessorial charges. An LTL freight class calculator lets a shipper check their class before booking, rather than accepting a carrier's classification on faith. Because LTL carriers combine many shippers' freight on one trailer, an accurate class also protects against reclassification fees — a common and costly billing adjustment when the class on the bill of lading doesn't match what the carrier measures at the dock.

Shipping Class Calculator for Any Carrier

This shipping class calculator is carrier-agnostic: because the NMFC density chart is an industry standard, the estimate applies whether you're booking with a national LTL carrier, a regional carrier, or through a freight broker. Always confirm the exact NMFC number and class quoted on your bill of lading, since individual carriers may apply exceptions for specific commodities.

How to Determine Freight Class Without Guessing

Shippers who don't know how to determine freight class often default to whatever class their carrier suggests — which is frequently the highest class in the applicable range. Measuring density yourself, in three steps: measure, weigh, divide, gives you an independent number to check the quote against, and it's the same method carrier classification inspectors use at the dock.

Calculate Freight Class Free, With No Sign-Up

Every calculation on this page runs locally in your browser. There's no account, no email capture, and no shipment data sent to a server, so you can calculate freight class free as many times as you need while you compare packaging options or quote multiple shipments.

Freight Class Density Chart

The table below is the standard density-based bracket table referenced across the LTL industry. It's also the benchmark the calculator above uses to return your class.

Density (lb/ft³)Freight ClassTypical Commodities
Less than 1500Ping-pong balls, bulky foam
1 – 2400Feathers, empty crates
2 – 4300Furniture, gaming tables
4 – 6250Mattresses, bookcases
6 – 8175Couches, stuffed furniture
8 – 10125Small appliances, computers
10 – 12100Wine cases, engine parts
12 – 1592.5Computers, monitors
15 – 22.585Crated machinery
22.5 – 3070Car parts, food items
30 or more60 – 50Steel, bricks, dense metal parts

Freight Class Benchmarks by Common Shipment Type

Shipment typeTypical density (lb/ft³)Typical class
Palletized dry goods (boxed)9 – 14100 – 125
Upholstered furniture5 – 8175 – 250
Machinery on skids15 – 3070 – 85
Empty or lightly filled containers< 2400 – 500
Palletized beverages20 – 3560 – 70

Frequently Asked Questions

Freight class is a standardized NMFC code from 50 to 500 that LTL carriers use to price a shipment, based mainly on density along with stowability, handling and liability. A wrong class often triggers a reclassification fee, so an accurate estimate helps avoid billing surprises.
Density in pounds per cubic foot is calculated by dividing shipment weight by cubic feet. That value is matched against the NMFC density-based class chart, ranging from class 500 for very light, bulky freight down to class 50 for dense, compact freight.
Yes. It runs entirely in your browser, requires no account, and does not store your shipment data on a server. It is free for unlimited calculations.
No. Density is the primary factor for most general commodities, but classification also weighs stowability, ease of handling and liability. This tool gives a density-based estimate; your carrier's bill of lading determines the final billed class.
The NMFC number identifies the specific commodity, while freight class is the 50–500 pricing code tied to that commodity's density tier. Different NMFC numbers can share a class if their densities land in the same range.
Carriers reweigh and re-measure shipments, rounding dimensions and weight, which can shift density into a different bracket. Packaging and how a pallet is loaded also affect the measured cube.
For one commodity on multiple pallets, add total weight and total cubic feet across all pallets, then divide total weight by total cubic feet for one blended density and class. The Multiple Pallets tab automates this.
You can't change a commodity's true class, but you can often lower the billed class by increasing density — a smaller footprint, stacking instead of spreading freight, and tighter packaging all shrink the cube relative to weight.

Reviewed and maintained by the editorial team at freightclasscalculator.online. Last updated: July 2026.