Freight Class Calculator
Estimate the NMFC freight class of an LTL shipment from its density
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Quick summary
Enter your shipment's weight and dimensions to compute its density (pounds per cubic foot) and the estimated NMFC freight class used for LTL pricing. A 500-lb pallet at 48×40×48 inches is about 53 ft³ and 9.4 lbs/ft³, landing in class 100. Denser freight gets a lower (cheaper) class; light, bulky freight gets a higher one. Density is the primary driver, though the official class can also depend on stowability, handling, and liability.
Reviewed by Simple Calculators TeamLast reviewed
How to use this calculator
- Enter the inputs requested by the calculator.
- Choose the units or options that match your situation and review the assumptions.
- Run or update the calculation to see the result.
- Review the result, breakdown, and formulas shown on the page.
- Check the inputs, units, dates, and limitations before saving or sharing the result.
Frequently asked questions
How is freight class determined?
For most commodities, by density — pounds per cubic foot. Higher density means a lower class number and typically lower cost per pound. The NMFC system defines 18 classes from 50 (dense, cheap) to 500 (light, bulky, expensive). This calculator maps your shipment's density to its class.
How do I calculate freight density?
Divide total weight by total volume in cubic feet. Volume is length × width × height (inches) ÷ 1,728. A 500-lb shipment at 48×40×48 inches is 92,160 in³ ÷ 1,728 = 53.3 ft³, so density is 500 ÷ 53.3 ≈ 9.4 lbs/ft³. Include the full pallet dimensions, not just the product.
Why does freight class matter for cost?
LTL carriers price largely by class: a lower class (denser freight) generally means a lower rate. Misclassifying a shipment leads to reweigh-and-reclass fees and billing adjustments. Getting density and class right up front produces accurate quotes and avoids surprise charges.
Is density the only factor in freight class?
No — it's the main one, but the official NMFC class can also reflect stowability, ease of handling, and liability (value/fragility). Some commodities have a fixed class regardless of density. Use this density estimate as a strong starting point, then confirm the exact class with your carrier or the NMFC listing.
Key terms
- Freight Class
- NMFC category (50–500) that drives LTL pricing; lower is cheaper.
- Density
- Pounds per cubic foot; the primary factor in determining freight class.
- LTL
- Less-Than-Truckload — shared-truck freight priced by class and weight.
- NMFC
- National Motor Freight Classification, the standard that defines freight classes.
Methodology, sources & limitations
This page shows the formula, assumptions, and limitations used for this estimate. Rates, thresholds, and other time-sensitive inputs can change, so verify them against the relevant official source before relying on a result.
For our review approach and the primary sources we consult, see the methodology and source policy. If you spot an outdated figure or formula, please contact us with a correction.