Freight density calculator
Density, measured in pounds per cubic foot, is the number that decides your freight class for most shipments. Enter your pallet below to get cubic feet, density, and an estimated class in real time.
Estimate your freight class
Estimated density-based class. Some commodities have NMFC-specific classifications — we can verify the final class before booking.
How to calculate freight density
Freight density is weight divided by volume. For LTL it is always expressed in pounds per cubic foot (PCF), and it takes two steps:
- Cubic feet = length × width × height (in inches) ÷ 1,728, for each handling unit. Add the units together. (1,728 is the number of cubic inches in a cubic foot: 12 × 12 × 12.)
- Density (PCF) = total weight in pounds ÷ total cubic feet.
If your dimensions are in centimeters, multiply them together and divide by 28,317 to get cubic feet, and multiply kilograms by 2.2046 to get pounds. The calculator above does the math for identical pallets; for a mixed shipment, total the cubic feet line by line as shown in example 3 below.
How to measure a pallet the way the carrier will
Carriers increasingly measure freight with dimensioners, overhead scanners that capture every pallet crossing the dock. Your numbers need to match what that machine sees. Measure like this:
- Include the pallet. Height runs from the floor to the highest point of the load, so a standard wood pallet adds roughly 5 to 6 inches. Its weight counts too; a typical wood pallet adds dozens of pounds.
- Measure at the widest points. If cartons overhang the pallet, the overhang is the dimension. A 48 × 40 pallet with boxes sticking out an inch on every side is 50 × 42.
- Measure the tallest point, not the average. One carton sitting higher than the rest sets the height for the whole unit.
- Round up to the next whole inch. 47.25 inches is 48. Carriers round up, so should you.
- Weigh on a real scale. Estimated weights are the most common cause of a reweigh. A pallet jack scale or floor scale pays for itself quickly.
- Length is the longer side of the footprint, width the shorter, but for density the order doesn’t matter; the product is the same.
Worked examples
Example 1: a standard pallet
A 48 × 40 × 48 inch pallet (pallet included) weighing 600 lb.
- Volume: 48 × 40 × 48 = 92,160 cubic inches ÷ 1,728 = 53.33 cubic feet
- Density: 600 ÷ 53.33 = 11.25 lb per cubic foot
- Estimated density-based class: 92.5
Example 2: the overhang that changes the class
A shipper measures a 700 lb pallet as 48 × 40 × 52: the pallet’s footprint, and a height rounded down from 52.5 inches. That gives 57.78 cubic feet and 12.12 PCF, class 85.
On the dock, the carrier sees cartons overhanging an inch on each side and rounds the height up: 50 × 42 × 53 = 64.41 cubic feet, so 700 ÷ 64.41 = 10.87 PCF, class 92.5. The shipment gets reclassed, rebilled at the higher class, and may pick up an inspection fee that varies by carrier tariff. Measuring honestly up front would have produced the correct quote the first time.
Example 3: a mixed shipment
Three pallets at 48 × 40 × 40 and 450 lb each, plus one tall pallet at 48 × 40 × 72 and 300 lb.
- Short pallets: 48 × 40 × 40 ÷ 1,728 = 44.44 cubic feet each, 133.33 for three
- Tall pallet: 48 × 40 × 72 ÷ 1,728 = 80.00 cubic feet
- Total: 1,650 lb ÷ 213.33 cubic feet = 7.73 PCF, estimated class 125
If all four pallets are the same commodity, the shipment is typically rated on that combined density. If they are different products, each line gets its own class: the short pallets are 10.13 PCF (class 92.5) and the tall one is 3.75 PCF (class 250). Either way, notice how one light, tall pallet drags the whole average down. List each line separately on the bill of lading so the carrier sees exactly what you measured.
Density to freight class: the 13-tier scale
On July 19, 2025, the NMFTA moved density-rated commodities onto a standardized 13-tier density scale. This is the table the calculator uses:
| Density (lb per cubic foot) | Estimated class |
|---|---|
| 50 and over | 50 |
| 35 – under 50 | 55 |
| 30 – under 35 | 60 |
| 22.5 – under 30 | 65 |
| 15 – under 22.5 | 70 |
| 12 – under 15 | 85 |
| 10 – under 12 | 92.5 |
| 8 – under 10 | 100 |
| 6 – under 8 | 125 |
| 4 – under 6 | 175 |
| 2 – under 4 | 250 |
| 1 – under 2 | 300 |
| Less than 1 | 400 |
The result is an estimated density-based freight class. Some commodities keep NMFC item-specific classes where handling, stowability or liability set the class regardless of density, and hazardous materials can carry their own rules. We verify the final class before booking. For the full background, read what is freight class?
Why a lower class matters: what it costs
Here is what 500–999 lb shipments cost across Armstrong’s LTL network by class, September 2025 – August 2026. These are all-in rates Armstrong customers paid, including fuel and any accessorials, for the middle 50% of shipments. They are not quotes.
| Class group | Middle 50% paid | Typical (median) |
|---|---|---|
| Class 50–65 (dense) | $215–$405 | $285 |
| Class 70–92.5 | $250–$485 | $350 |
| Class 100–125 | $285–$655 | $400 |
| Class 150+ (light, bulky) | $430–$855 | $610 |
Source: 97,351 LTL shipments arranged by Armstrong Transport Group, September 2025 – August 2026. Distance and lane also move price; see the pallet shipping cost guide and lane pages.
How to raise density and lower your class
Density-rated freight rewards anything that puts the same weight in less space. The most effective moves:
- Build tighter pallets. Stack cartons in a column pattern flush to the edges, with no overhang and no pyramid tops. Every inch of height on a 48 × 40 footprint is 1.11 cubic feet.
- Right-size cartons. Air in the box is billed like product. Smaller cartons and less void fill pay back fast on light goods.
- Consolidate. Two half-height pallets of the same product often ship better as one full pallet, removing a second pallet’s wood and wasted headroom.
- Mark it stackable when it is. Do-not-stack freight can be rated as if it occupied the full height of the trailer. Put a cap or corner boards on the pallet so it can take weight.
- Mix dense and light product on one pallet when it’s the same commodity and the freight can take it, so the combined density lands in a better band.
- Watch the band edges. Example 2 above landed at 10.87 PCF, class 92.5; at 12 PCF or more it would have been class 85. When your freight sits just below a threshold, trimming a couple of inches of height can drop a full class.
Very light freight and cubic capacity rules
At the bottom of the scale, anything under 1 PCF is class 400. But light, bulky freight has a second problem: it fills trailers without paying for the space. Many LTL carriers publish cubic capacity or linear foot rules that override the class rate when a shipment is both large and light. A common style of rule applies a minimum charge once a shipment passes a set volume (often in the hundreds of cubic feet) below a set density, but the thresholds and charges vary by carrier tariff.
If you ship foam, empty containers, furniture frames, insulation or anything similar in volume, get the freight quoted as volume LTL or partial truckload rather than letting the class rate and a cubic capacity charge stack up. See LTL vs. truckload for where that line usually falls.
Density mistakes that cost money
- Measuring the product and forgetting the pallet.
- Using the pallet’s 48 × 40 footprint when cartons overhang it.
- Rounding down, or averaging the height of an uneven load.
- Guessing the weight from a product spec sheet instead of a scale.
- Quoting one class and printing a different one on the BOL.
If an invoice already came back reclassed, the free LTL invoice audit tool will check the math against your dimensions. And for how class feeds into the final price, see how LTL rates are calculated.
Frequently asked questions
How do you calculate freight density?
Multiply length x width x height in inches for each handling unit, divide by 1,728 to get cubic feet, and add up the cubic feet for all pieces. Then divide the total weight in pounds by the total cubic feet. The result is density in pounds per cubic foot (PCF).
Do I include the pallet when measuring freight?
Yes. The pallet is part of the handling unit, so its height goes into your height measurement and its weight goes into your weight. Carriers measure the whole unit on the dock, pallet included, and so should you.
What freight class is 10 pounds per cubic foot?
On the 13-tier density scale that took effect July 19, 2025, a density of 10 up to under 12 lb per cubic foot is class 92.5. That is an estimated density-based freight class; commodities with their own NMFC item-specific class can rate differently.
How many cubic feet is a standard pallet?
A 48 x 40 inch pallet has a footprint of 13.33 square feet, so each foot of height adds 13.33 cubic feet. A 48 x 40 x 48 inch pallet is 53.33 cubic feet and a 48 x 40 x 60 inch pallet is 66.67 cubic feet.
Should I round my dimensions up or down?
Round each dimension up to the next whole inch. Carriers measure to the extreme points and round up, so rounding down on your BOL almost guarantees a mismatch, and a mismatch can mean a reclass and an inspection fee.
How do I lower my freight class?
For density-rated freight, raise the density: cut empty space in the load, use a smaller pallet or none if the carrier allows it, remove overhang, right-size cartons and avoid shipping tall, light pallets as non-stackable. Lower class means a lower rate per pound.
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