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Freight Density Calculator

Freight density in lb/ft³ (or kg/m³) and the likely NMFC freight class for LTL shipments.

Enter values

Results update as you type.

Result

Density

5 lb/ft³

Cubic feet
50
Estimated freight class
175
Density (metric)
80.1 kg/m³

Class estimate from density only — actual NMFC class also depends on stowability, handling and liability.

About the Freight Density Calculator

Freight density in lb/ft³ (or kg/m³) and the likely NMFC freight class for LTL shipments.

Also known as: freight class calculator, lb per cubic foot, nmfc class.

How to use this calculator

  1. Enter weight, length (in), width (in), height (in).
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

Density = weight ÷ (L × W × H ÷ 1728)

Worked example

Using the values pre-filled in the calculator above:

  • Weight = 250 lb
  • Length (in) = 48
  • Width (in) = 40
  • Height (in) = 45

the calculator returns:

  • Density: 5 lb/ft³
  • Cubic feet: 50
  • Estimated freight class: 175
  • Density (metric): 80.1 kg/m³