PCF Unit Meaning in Shipping: What Is Pounds Per Cubic Foot?
PCF stands for Pounds Per Cubic Foot — the density measurement that determines your LTL freight class. Here's what it means, how to calculate it, and what a good PCF looks like.
PCF — pounds per cubic foot — is the single number that determines how much you pay to ship LTL freight. Calculate it correctly and you get the right class, the right rate, and no surprise adjustment fees. Get it wrong and the carrier recalculates it for you, at your expense.
What Does PCF Mean in Shipping?
PCF is how the LTL freight industry measures density. A shipment's density tells a carrier two things: how much weight they can move per truckload, and how much space a shipment consumes relative to its revenue. Carriers want dense freight — a pallet of steel bolts fills space and generates revenue. A pallet of foam packaging fills the same space but weighs almost nothing.
The NMFC (National Motor Freight Classification) system uses PCF density to assign every LTL shipment to a freight class from 50 to 500. That class number directly determines your LTL rate. PCF is the input; freight class is the output.
PCF in context: Water is 62.4 PCF. Concrete is ~150 PCF. Steel is ~490 PCF. Most general palletized freight falls between 6 and 30 PCF. Foam packaging or empty boxes can be under 1 PCF — which lands at Class 500, the most expensive rate in the NMFC system.
PCF Formula — How to Calculate It
The calculation is two steps:
Step 2: PCF = Total weight (lbs) ÷ Cubic feet
The number 1,728 is the cubic inches in one cubic foot (12 × 12 × 12). You divide by it to convert from cubic inches to cubic feet.
Worked example
A standard pallet of goods: 48" × 40" × 48" (L×W×H), total weight 500 lbs including the pallet.
Cubic feet: 92,160 ÷ 1,728 = 53.33 ft³
PCF: 500 ÷ 53.33 = 9.38 PCF → Freight Class 100
PCF to Freight Class — The Full Table
Once you have your PCF number, find your freight class here. The July 2025 NMFC update (Docket 2025-1) reduced the density scale from 18 to 13 tiers — Classes 77.5, 110, 150, and 200 are no longer density outputs.
| PCF Density | Freight Class | Typical freight | Cost level |
|---|---|---|---|
| 50+ PCF | 50 | Steel coils, bricks, bolts, nuts | Lowest |
| 35–50 PCF | 55 | Cement, hardwood flooring, bricks on pallets | Very low |
| 30–35 PCF | 60 | Car parts, bottled beverages | Low |
| 22.5–30 PCF | 65 | Crated machinery, cast iron parts | Low–medium |
| 15–22.5 PCF | 70 | Food products, auto parts, lumber — most common | Medium–low ⭐ |
| 12–15 PCF | 85 | Crated machinery, vinyl flooring, transmissions | Medium ⭐ |
| 10.5–12 PCF | 92.5 | Computers, monitors, televisions | Medium–high |
| 9–10.5 PCF | 100 | Boat covers, wine cases, canvas | High |
| 7–9 PCF | 125 | Small household appliances, cabinets | Higher |
| 5–7 PCF | 175 | Clothing, fabric, couch cushions | Very high |
| 3–5 PCF | 250 | Bamboo furniture, packaged mattresses | Extremely high |
| 1–3 PCF | 300–400 | Wood cabinets, deer antlers, stuffed animals | Near-maximum |
| <1 PCF | 500 | Ping pong balls, empty packaging, bags of gold dust | Maximum |
Note: Classes 77.5, 110, 150, and 200 were removed as density outputs by the July 2025 NMFC Docket 2025-1. The 13-tier scale above reflects the current standard.
PCF in Context — Real Density Examples
It helps to anchor PCF to materials you know:
| Material / Item | PCF | Freight class (if palletized) |
|---|---|---|
| Steel | ~490 | Class 50 (densest possible) |
| Concrete | ~150 | Class 50 |
| Water | 62.4 | Class 50 |
| Bottled beverages (palletized) | ~30 | Class 60 |
| General warehouse freight (target) | 15–25 | Class 65–70 |
| Electronics (boxed) | ~10–12 | Class 85–92.5 |
| Clothing / apparel | ~5–6 | Class 175 |
| Foam packaging / empty boxes | <1 | Class 500 — maximum rate |
What Is a Good PCF for LTL Shipping?
The target for most shippers is 15 PCF or higher, which puts you at Class 70 or below. This is where LTL rates become cost-effective. Below 10 PCF you're paying a significant premium per pound.
How to Improve Your PCF (and Lower Your Freight Class)
1. Always include pallet weight
A standard GMA 48×40 pallet weighs 40–50 lbs. Including it in your total weight increases density. On a light shipment this single step can move you one full freight class lower — saving 10–20% on the LTL rate.
2. Tighten your packaging
Excess void fill and oversized boxes increase cubic volume without adding useful weight. The goal is to minimize empty space. Every inch of unnecessary packaging reduces your PCF and raises your class.
3. Consolidate multiple pieces onto one pallet
LTL carriers calculate density per shipment, not per piece. Multiple small boxes loose on a pallet may be measured individually, each with their own low density. Stacking them tightly and wrapping them as a single unit means the carrier calculates density for the whole load.
4. Know when PCF doesn't apply
Some NMFC items have commodity-specific freight classes that override density. If your product has an NMFC item number, check whether it's density-based or commodity-based. The July 2025 Docket 2025-1 moved thousands more items to density-first, but some still have fixed classes.
Calculate your PCF and freight class instantly
Enter your dimensions and weight — the calculator returns your exact PCF density and maps it to the current NMFC freight class. Free, no sign-up.
Open Free PCF Calculator →Frequently Asked Questions
What does PCF stand for in shipping?
PCF stands for Pounds Per Cubic Foot — the standard unit of freight density used in US LTL shipping to determine NMFC freight class. Higher PCF = lower class = cheaper shipping.
What is a PCF unit of measurement?
PCF measures how much weight occupies a cubic foot of space. Water is 62.4 PCF. Concrete is ~150 PCF. Most general palletized freight falls between 6 and 30 PCF. Below 1 PCF lands at Class 500 — the most expensive LTL rate.
How do you calculate PCF for freight?
PCF = Total weight (lbs) ÷ Cubic feet. Get cubic feet by multiplying L × W × H in inches then dividing by 1,728. A 48×40×48" pallet weighing 500 lbs = 53.33 cubic feet → 9.38 PCF → Class 100.
What is a good PCF for LTL shipping?
15 PCF or higher is the target — that gets you Class 70 or below where LTL rates are reasonable. Under 6 PCF puts you in expensive Class 150–500 territory. If you're consistently low, focus on tighter packaging and including pallet weight.
What is 100 PCF in freight?
100 PCF is very dense freight — close to the density of water (62.4 PCF). At 100 PCF your shipment would be Class 50, the cheapest LTL class. Most general freight never reaches 100 PCF. Steel, metal parts, and very heavy machinery are typical 50+ PCF freight.
What is the difference between PCF and freight class?
PCF is the density you calculate. Freight class (50–500) is the NMFC classification assigned based on that density. PCF is the input; freight class is the output. Calculate PCF first, then use the density-to-class table to find your freight class.