Freight Density Calculator: How to Calculate LTL Freight Density & Class
Freight density calculator for LTL shipping — enter your shipment dimensions and weight to get density in PCF (pounds per cubic foot) and your NMFC freight class instantly. Free, no signup required.
Freight density is the single most important number in LTL shipping — it determines your freight class, which determines your rate. Get it wrong and you'll either overpay or face a costly carrier reclassification fee. Here's how to calculate freight density, what PCF means, how it maps to NMFC freight classes, and how to use a free freight density calculator before booking.
⚡ Freight density formula
Volume = (48 × 40 × 48) ÷ 1,728 = 53.3 ft³
Density = 500 ÷ 53.3 = 9.38 PCF → Class 92.5
What Is Freight Density and Why Does It Matter?
Freight density — measured in PCF (pounds per cubic foot) — describes how much a shipment weighs relative to the space it occupies on the carrier's truck. LTL carriers use density to classify freight under the NMFC (National Motor Freight Classification) system.
The logic: a carrier allocates space in a trailer. Dense, heavy freight fills space efficiently — the carrier makes good revenue per cubic foot. Light, bulky freight uses lots of space for little weight — the carrier needs to charge more per pound to make up for the wasted space. This is why freight class exists: it's essentially a density-based pricing mechanism.
Higher PCF = lower class number = cheaper rate per pound. A shipment at 15 PCF (Class 70) costs significantly less per pound than the same shipment at 3 PCF (Class 250).
How to Calculate Freight Density Step by Step
Freight Density to NMFC Class — 2026 Table
Under the NMFC 13-tier density scale effective July 2025, freight class is determined solely by PCF density for most commodities. This replaced a more complex system that included stowability and handling factors for many items.
| Density (PCF) | NMFC Class | Rate tier | Typical freight |
|---|---|---|---|
| < 1 PCF | 400 | Most expensive | Ping pong balls, balloons, very light packaging |
| 1–2 PCF | 300 | Very expensive | Foam products, empty bottles, pillows |
| 2–4 PCF | 250 | Expensive | Large furniture, kayaks, bicycles |
| 4–6 PCF | 175 | High | Sofas, mattresses, empty drums |
| 6–8 PCF | 125 | Above average | Small appliances, auto parts, books |
| 8–10 PCF | 100 | Average | Electronics, tools, canned goods |
| 10–12 PCF | 92.5 | Below average | Packaged food, hardware, machine parts |
| 12–15 PCF | 85 | Low | Steel parts, heavy machinery components |
| 15–22.5 PCF | 70 | Very low | Dense metals, aggregate materials |
| > 50 PCF | 50 | Lowest | Scrap metal, concrete, cast iron |
NMFC 13-tier density scale effective July 2025 (Docket 2025-1). Some commodities may have specific NMFC item numbers that override density-based class.
Freight Density Examples by Shipment Type
| Shipment | Dims (inches) | Weight (lbs) | PCF | Class |
|---|---|---|---|---|
| Standard pallet, consumer goods | 48×40×60 | 800 | 12.0 | 85 |
| Furniture (sofa) | 84×36×40 | 120 | 2.1 | 250 |
| Heavy machinery parts | 48×40×24 | 1,200 | 45.0 | 55 |
| Electronics (boxed) | 48×40×48 | 450 | 8.4 | 100 |
| Empty drums (loose) | 48×40×72 | 180 | 2.8 | 250 |
How to Increase Freight Density and Lower Your Class
Since freight density determines class, improving density directly reduces your shipping cost. Several practical approaches work:
- Consolidate onto fewer pallets. Spreading freight across more pallets than necessary reduces density per pallet. Combining into fewer, fuller pallets increases PCF and can lower your class.
- Remove unnecessary packaging. Oversized boxes add volume without adding weight. Right-sizing packaging is the fastest way to improve density.
- Stack freight to full pallet height. A pallet at 40-inch height has lower density than the same weight at 50-inch height — wait, the reverse is true. Shorter, denser stacks have higher PCF. A compact pallet is denser than a tall one with the same weight.
- Nest or break down products. Products that can be disassembled or nested (furniture legs, pipes, brackets) dramatically increase density per pallet.
Freight Density Calculator vs PCF Calculator — Same Thing
Freight density calculator, PCF calculator, cargo density calculator, and LTL density calculator all refer to the same tool — something that takes your shipment dimensions and weight and outputs pounds per cubic foot. The terminology varies by industry but the math is identical.
The CargoTools freight density calculator does this in one step — enter length, width, height, and weight, and it returns your PCF density and maps it to the correct NMFC freight class under the 2025 13-tier scale. Free, no signup.
Free Freight Density Calculator
Enter shipment dimensions and weight — get PCF density and NMFC freight class instantly.
Calculate Freight Density →Frequently Asked Questions
How do I calculate freight density?
PCF = weight (lbs) ÷ volume (ft³). Volume = (L" × W" × H") ÷ 1,728. Or use the free freight density calculator — enter dimensions and weight, get PCF and freight class instantly.
What is a good freight density for LTL?
Higher is better. Above 10 PCF qualifies for Class 92.5 or lower — the most cost-effective classes. Above 15 PCF gives Class 70 or below. Most industrial and consumer goods fall between 6–15 PCF. Below 4 PCF (Class 175–250) is expensive and worth trying to improve through packaging optimisation.
What is freight class 92.5?
Freight class 92.5 covers shipments with density between 10 and 12 PCF under the NMFC 13-tier scale. It's one of the most common classes for industrial goods, packaged food, and hardware. Class 92.5 is just below Class 100 — a small improvement in density from 9 PCF to 10 PCF saves you one class tier.
What is the difference between freight density and DIM weight?
Freight density (PCF) is used for LTL freight to determine NMFC class and rate per hundredweight. Dimensional weight (DIM weight) is used for parcel carriers (UPS, FedEx, USPS) to determine billable weight per package. Both measure size-to-weight ratio but apply to different shipping modes with different formulas.
How does freight density affect my LTL rate?
Freight density maps to NMFC class, and class determines the rate per hundredweight (CWT) your carrier charges. Class 50 freight might cost $12/CWT while Class 250 costs $85/CWT on the same lane. Improving density by one class tier (e.g., from Class 125 to Class 100) can reduce your rate by 15–25% on that shipment.