What Is Freight Density?
Freight density describes how much weight is packed into a unit of shipment volume. A denser shipment has more weight for the same space; a less dense shipment has less weight for the same space.
Cargo calculator
Freight Density Calculator
Calculate shipment density from carton dimensions and actual weight, or from known total shipment weight and volume. Results show kg/m³ and lb/ft³ with transparent totals.
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Freight density guide
Understanding freight density
Use these notes to verify the calculator output and understand how density relates to volume, weight, and billing concepts.
Freight Density Formula
Total shipment weight ÷ total shipment volume
For carton rows, CargoMeasure first totals the shipment weight and volume, then divides those totals. It does not average individual row densities.
Freight Density Example
A carton measures 50 × 40 × 30 cm, quantity is 10, and each carton weighs 15 kg. Total volume is 0.60 m³ and total weight is 150 kg.
Example result
150 kg ÷ 0.60 m³ = 250 kg/m³. The same density is 15.61 lb/ft³.
Freight Density From Known CBM
If the shipment is 600 kg and total volume is 2.4 CBM, density is 600 ÷ 2.4 = 250 kg/m³. Use the known shipment mode when you already have total weight and CBM.
Freight Density in lb/ft³
If the shipment is 1000 lb and total volume is 50 ft³, density is 1000 ÷ 50 = 20 lb/ft³, which is approximately 320.37 kg/m³.
Density vs CBM
CBM measures volume only. Density combines weight and volume. If you need shipment volume before entering density, use the CBM Calculator.
Density vs Volumetric Weight
Volumetric weight converts shipment dimensions into a billing-weight estimate using a divisor. Density is actual shipment weight divided by actual shipment volume. For dimensional weight, use the Volumetric Weight Calculator.
Density vs Chargeable Weight
Chargeable weight compares actual weight with dimensional or volumetric weight under a carrier rule. Density can help describe a shipment, but it is not the same as the final billable weight. Use the Chargeable Weight Calculator for that comparison.
Freight Density and Freight Class
Density can be one input in some freight classification or rating workflows, but density alone does not determine every class or rate. CargoMeasure does not calculate NMFC freight class or carrier-specific class tables.
Why Packed Dimensions Matter
Density should be based on the cargo as shipped. Cartons, padding, wrapping, pallet overhang, and void space can change the volume that carriers and warehouses see.
Common Mistakes
- Using product size instead of packed shipping dimensions.
- Mixing kg and lb without converting them consistently.
- Mixing CBM and cubic feet without converting the volume.
- Averaging row densities instead of dividing total shipment weight by total shipment volume.
- Forgetting to multiply carton volume and weight by quantity.
- Treating density as a complete freight class or price calculation.
FAQ
Freight Density Calculator FAQ
What is freight density?+
Freight density is shipment weight divided by shipment volume. CargoMeasure shows it as kg/m³ and lb/ft³.
Should I use product dimensions or packed dimensions?+
Use packed outer carton or cargo dimensions. Packaging, void fill, and palletization can change the shipment volume.
Does freight density determine freight class?+
Not by itself. Density can be one input in freight classification, but commodity, handling, liability, and carrier rules can also matter.
Can I calculate density from known CBM?+
Yes. Use the known shipment mode, enter total weight and total CBM, and the calculator will divide weight by volume.
Why are both kg/m³ and lb/ft³ shown?+
Metric and imperial teams often use different density units, so the calculator displays both from the same shipment totals.