Freight Class Calculator — Free NMFC & PCF Density Tool

Instantly calculate your LTL freight class and PCF density (pounds per cubic foot) using the NMFC density formula. Enter your shipment's dimensions and weight — including the pallet — and get your freight class in seconds. Free, no signup required, trusted by 5,000+ warehouse managers and freight brokers.

18 Classes

NMFC 50-500 coverage

Instant

PCF calculation

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💡 Pro Tip: Incorrect freight class is the #1 cause of carrier re-class fees. Calculate your density first to ensure accurate classification and avoid unexpected charges averaging $75-200 per shipment.

Calculate PCF Density & Freight Class

Calculate PCF (Pounds Per Cubic Foot) density and determine your NMFC freight class instantly. Enter dimensions including pallets for accurate classification.

Item/SKU Identifier

Use any identifier you like: 1, 2, 3, A, B, C, or a full SKU.

Pallet Count

Total Weight (lbs)

Dimensions (Inches) L x W x H

Length

Width

Height

Pro Tip: Always measure the extreme dimensions of the palletized shipment. Carriers will re-weigh and charge for overhang.

Estimated Freight Class

Enter Dimensions

0.00

Density (PCF)

0.00

Volume (ft³)

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Important: Calculation Disclaimer

This calculator determines freight class based on density (PCF) using the official NMFC formula. For most general freight, density is the primary classification factor and this calculation is accurate.

However, some commodities have special handling requirements, liability considerations, or stowability factors that may affect the final freight class beyond density alone. Examples include:

Hazardous materials (regulated by DOT/HAZMAT codes)
High-value items (electronics, jewelry) where liability affects classification
Fragile or unusually shaped freight requiring special handling
Specific commodities with fixed NMFC codes that override density calculations

✓ Best Practice: Use this calculator for initial freight class determination, then verify with your carrier before finalizing your Bill of Lading, especially for first-time shipments or unusual commodities.

This tool is provided for informational purposes. CargoTools is not liable for any carrier re-classifications, rate disputes, or shipping costs. Always confirm freight class with your chosen carrier.

What is PCF Density?

PCF (Pounds Per Cubic Foot) is the density measurement that determines your freight class. It's calculated by dividing your shipment's total weight by its total volume in cubic feet.

PCF Density Formula:

PCF = Weight (lbs) ÷ Volume (cubic feet)

Volume = (Length × Width × Height in inches) ÷ 1,728

📈 Higher PCF Density

✅ Lower freight class
✅ Lower shipping cost
✅ Dense items (machinery, metal, books)
Example: 50 PCF = Class 50

📉 Lower PCF Density

⚠️ Higher freight class
⚠️ Higher shipping cost
⚠️ Light items (pillows, lampshades, foam)
Example: 2 PCF = Class 300

💡 Pro Tip:

Always include pallet weight (30-70 lbs) and pallet dimensions when calculating PCF density. Forgetting the pallet lowers your calculated density, which triggers carrier re-classification and fees of $50-500 per shipment.

Use the calculator above to instantly determine your PCF density and freight class. Free • No signup • Instant results

Recent Calculation History

ID / Date	Class	Dimensions	Weight	Actions

How to Calculate Manually

If you don't have this tool handy, here is the formula carriers use to determine density (PCF).

Measure L, W, H in inches.
Multiply them to get Cubic Inches.
Divide by 1,728 to get Cubic Feet.
Divide Weight (lbs) by Cubic Feet.

Density = Weight / ((L x W x H) / 1728)

Common Mistakes

❌ Ignoring Pallet Weight: You must include the ~40lbs of the wooden pallet in your calculation.
❌ Ignoring Overhang: If a box sticks out 1 inch over the pallet, you must measure the box, not the pallet.
❌ Guessing: "Class 70" is not a catch-all. If your density is actually 8 PCF, you will be re-classed to 125.

NMFC Classification Methodology

The Freight Class Calculator provided by CargoTools.online is engineered to mirror the NMFC (National Motor Freight Classification) guidelines, primarily focusing on the density (PCF) characteristic. This is the most common factor determining the class from 50 (most dense) to 500 (least dense).

Our algorithm uses the standard formula to derive PCF: PCF = Total Weight (lbs) / Total Volume (Cubic Feet). It then maps this value directly to the official NMFC density scale. By providing this transparent calculation, we help warehouse managers prevent unexpected re-weigh and re-class charges from carriers, ensuring maximum efficiency and cost control.

Disclaimer: While density is key, other factors like stowability, liability, and handling may affect the final published freight class. Always confirm your calculated class with your chosen freight carrier.

Complete Guide to Freight Class Calculation

What is Freight Class?

Freight class is a standardized classification system created by the National Motor Freight Traffic Association (NMFTA) to categorize LTL (less-than-truckload) shipments. Classes range from 50 (densest, cheapest) to 500 (least dense, most expensive). Your freight class directly determines your shipping rate—incorrect classification can result in carrier re-class fees averaging $75-200 per shipment.

The classification system ensures fair pricing by accounting for how much space freight occupies relative to its weight. Dense items like steel or bricks are cheaper to ship (Class 50) because they're heavy but compact. Light, bulky items like lampshades or ping pong balls cost more (Class 400-500) because they take up valuable trailer space without adding much weight.

The 4 Factors of Freight Classification

1. Density (Pounds per Cubic Foot)

The most important factor. Calculated as weight ÷ cubic feet. Higher density = lower class = cheaper shipping. This calculator focuses on density-based classification, which applies to 90% of general freight.

2. Stowability

How easily freight fits with other shipments. Odd shapes, hazardous materials, or fragile items that can't be stacked score poorly and may receive a higher class than density alone would suggest.

3. Handling

Special handling requirements increase class. Fragile items, extremely heavy pieces (over 30 lbs per unit), or awkward cargo requiring extra care cost more to ship due to labor and equipment needs.

4. Liability

High-value or theft-prone items (electronics, jewelry, art) carry higher class due to carrier risk. Carriers assume greater liability for expensive goods, which is reflected in the classification.

Freight Class Chart by Density

This table shows the relationship between PCF density and freight class under the updated July 2025 NMFC 13-tier density scale. Classes 77.5, 110, 150, and 200 are no longer assigned by density — they can only be reached via specific NMFC commodity codes.

Class	PCF Range	Common Examples
50	50+ lbs/ft³	Steel, bricks, cement, hardwood flooring
55	35-50 lbs/ft³	Bricks in boxes, hardwood in boxes
60	30-35 lbs/ft³	Car parts, granite slabs
65	22.5-30 lbs/ft³	Bottled beverages, books in boxes
70	15-22.5 lbs/ft³	Food items, automobile engines, lumber
85	12-15 lbs/ft³	Tires, bathroom fixtures
85	12-13.5 lbs/ft³	Crated machinery, cast iron stoves
92.5	10.5-12 lbs/ft³	Computers, monitors, televisions
100	9-10.5 lbs/ft³	Car covers, wine cases, boat covers
110	8-9 lbs/ft³	Cabinets, framed artwork
125	7-8 lbs/ft³	Small household appliances
150	6-7 lbs/ft³	Auto sheet metal parts, bookcases
175	5-6 lbs/ft³	Clothing, couch cushions, fabric
200	4-5 lbs/ft³	Packaged mattresses, aircraft parts
250	3-4 lbs/ft³	Bamboo furniture, mattresses
300	2-3 lbs/ft³	Wood cabinets, tables, chairs
400	1-2 lbs/ft³	Deer antlers, stuffed animals
500	< 1 lb/ft³	Ping pong balls, bags of gold dust

How to Avoid Freight Class Errors

Freight class mistakes are expensive. Here's how to avoid the most common errors that trigger carrier re-class fees:

Always measure accurately: Use the outermost dimensions including pallets, crates, and skids. Round UP to the nearest inch. Carriers will re-measure if dimensions seem off, and under-reporting triggers automatic audits.
Include packaging weight: Total weight must include boxes, pallets, stretch wrap, dunnage, and all protective materials. A standard wood pallet weighs 30-70 lbs—forgetting this is the #1 cause of re-class fees.
Consider NMFC codes: Some commodities have assigned classes regardless of density. Check the NMFC directory for specific product codes. Electronics, for example, may have fixed classes due to liability factors.
Document everything: Take photos of freight on the pallet, keep BOL (Bill of Lading) copies, save certified weight tickets. Visual proof wins re-class disputes 80% of the time.
Use FAK rates when available: Freight-All-Kinds (FAK) contracts let you ship multiple classes at one negotiated rate. If you ship regularly, FAK agreements eliminate classification headaches entirely.
Declare value accurately: Under-declaring invites re-class scrutiny. Over-declaring raises your class unnecessarily. Be honest about freight value—carriers verify high-value shipments.
Account for overhang: If your boxes extend beyond the pallet edges, measure the BOXES, not the pallet. A 48×40 pallet with 2 inches of overhang becomes 50×42 for freight class purposes.
Round dimensions properly: Always round UP to the next whole inch. Carriers round up, so you should too. A measurement of 47.1 inches becomes 48 inches.

Real-World Example: Freight Class Calculation

Scenario: You're shipping crated machinery via LTL carrier

• Pallet dimensions: 48" × 40" × 55" (includes 5" pallet height)
• Total weight: 850 lbs (including 45 lb pallet)

Step 1: Calculate cubic feet

(48 × 40 × 55) ÷ 1,728 = 61.1 ft³

Step 2: Calculate PCF density

850 lbs ÷ 61.1 ft³ = 13.9 PCF

Step 3: Determine freight class

13.9 PCF falls in 12-15 range = Class 85 (July 2025 13-tier scale)

Result: Your shipment is classified as Class 85 under the updated July 2025 NMFC density scale. Note: Class 77.5 is no longer assigned by density calculation — it can only be reached via a specific NMFC commodity code.

Frequently Asked Questions

How do I calculate freight class?

Calculate freight class by determining your PCF density: divide total weight (lbs) by total volume (cubic feet). Volume = (Length × Width × Height in inches) ÷ 1,728. Then match your PCF to the NMFC density chart above. For most general freight, density alone determines the class.

What is PCF density in freight shipping?

PCF (Pounds Per Cubic Foot) is the density measurement LTL carriers use to assign freight class. Higher density = lower class number = cheaper shipping. Lower density = higher class number = more expensive. A dense shipment at 25 PCF gets Class 70; a light shipment at 3 PCF gets Class 250.

Do I need to include pallet weight in freight class calculations?

Yes — always include the pallet weight (typically 30–70 lbs) and full pallet dimensions (adds 4–6 inches of height). Excluding the pallet lowers your calculated density, which causes carriers to re-class your shipment upward and charge re-class fees averaging $75–200 per occurrence.

What happens if I use the wrong freight class?

Using the wrong freight class results in carrier re-class fees of $50–500 per shipment plus the rate difference between classes. A Class 70 shipment misclassified as Class 125 can cost $200–400 extra on a single pallet. Carriers audit shipments at the dock and will re-weigh and re-measure if your declared class seems inconsistent with the freight.

What is the difference between freight class and NMFC code?

Freight class (50–500) is the broad pricing tier assigned to a shipment. NMFC codes are specific 4–6 digit commodity codes published by the National Motor Freight Traffic Association that assign a class to particular products — sometimes overriding density. For most general freight, density-based class is sufficient. For specialized commodities (electronics, food, hazmat), look up the specific NMFC code for your product.

How accurate is this freight class calculator?

This calculator uses the official NMFC density-to-class mapping and is accurate for standard palletized freight classified by density — which covers approximately 90% of LTL shipments. Some commodities have fixed NMFC codes that can override density (electronics, food-grade items, hazardous materials). Always confirm your final class with your carrier before printing the Bill of Lading for first-time or unusual shipments.

What is the most common freight class for LTL shipments?

Class 70 (15–22.5 PCF) and Class 85 (12–13.5 PCF) are the most common for general palletized freight in the US. Class 50–65 covers dense industrial items like machinery and building materials. Class 125–250 applies to lighter goods like furniture and apparel. Class 300–500 is rare and applies only to extremely light items like foam or inflatable products.

What is a FAK (Freight All Kinds) rate and when should I use it?

FAK (Freight All Kinds) is a negotiated rate agreement with your LTL carrier that allows you to ship multiple freight classes at a single blended rate — eliminating re-class disputes entirely. If you ship regularly (50+ shipments per month), ask your carrier rep about FAK rates. They simplify billing and can save 10–20% compared to class-based spot rates.

Can I use this calculator for international freight?

The NMFC freight class system is used for US domestic LTL (less-than-truckload) shipping only. For international ocean freight, use our Ocean Container Planner to optimize container loading. For international parcel shipments, dimensional weight (DIM weight) applies instead — use our DIM Weight Calculator.