Calculator
Example data table
| Packages | Dimensions | Weight | Volume (total) | Density | Estimated class |
|---|---|---|---|---|---|
| 4 | 48 in × 40 in × 45 in | 150 lb each | 200.00 ft³ | 3.00 lb/ft³ | Class 250 |
| 1 | 1.2 m × 0.8 m × 0.7 m | 120 kg | 0.67 m³ | 179.00 kg/m³ | Class 60 |
Examples are illustrative and rounded.
Formula used
How to use this calculator
- Select dimensions or volume input method.
- Enter package quantity and weight per package.
- If using dimensions, enter L, W, H and units.
- Click Calculate to view totals and density.
- Optional: enable Estimate class for a quick range.
- Use Download CSV or Download PDF for reports.
Notes for accurate results
- Use outside dimensions, including pallets, wrap, and dunnage.
- For mixed shipments, calculate each line item and compare densities.
- Class depends on more than density (commodity, handling, liability).
- If you have a declared NMFC item number, follow your carrier guidance.
Freight density guide
1) Why density matters for LTL rating
Freight density is the shipment’s weight divided by the space it occupies. LTL carriers commonly rate freight in pounds per cubic foot (lb/ft³) or kilograms per cubic meter (kg/m³). In general, higher density suggests easier handling and a lower class, which can reduce the base rate.
2) Measure “outside” dimensions for accuracy
Always measure the full footprint and height of the packaged freight. Include pallets, skids, corner boards, shrink wrap, and any overhang. For example, a 48×40 pallet with 45 inches of stacked height is rated on those outside dimensions, not the product’s internal box size.
3) Typical pallet and carton examples
A standard U.S. pallet is often 48 in × 40 in. If a palletized load is 150 lb and occupies about 50 ft³, its density is 3.0 lb/ft³. A compact 150 lb crate occupying 10 ft³ is 15 lb/ft³. Those two densities can fall into very different class ranges.
4) Units and conversion data used here
This calculator converts length to meters and computes volume in m³, then converts to ft³. The conversions are: 1 in = 0.0254 m, 1 ft = 0.3048 m, 1 lb = 0.45359237 kg, and 1 m³ = 35.3146667 ft³. Density conversions follow directly from these values.
5) Multi-package totals and mixed handling units
If you ship multiple identical cartons or pallets, total volume scales with quantity, and total weight scales the same way. Density stays the same when items are identical. If your shipment includes mixed items, calculate each line separately, then compare densities to avoid underestimating the space occupied.
6) Density bands and class behavior
Many rating guides use density breaks such as 1, 2, 4, 6, 8, 10.5, 12, 15, 22.5, 30, 35, and 50 lb/ft³. A density near 4 lb/ft³ is often rated higher than 8 lb/ft³. Small measurement errors can cross a break and change the estimate.
7) Stackability, packaging, and liability still matter
Density is only one factor. Fragile goods, hazardous materials, unusual shapes, or freight that cannot be stacked may rate higher than density alone suggests. Carriers also consider handling requirements, value, and damage risk. Use the class output as a planning reference, not a guarantee.
8) Practical tips to improve shipping results
Reduce “air” by using right-sized cartons and minimizing void fill. Keep pallets square and stable, and avoid overhang. Consolidate small parcels into a single handling unit when possible. Reweigh and remeasure before booking to match the bill of lading and limit reclassification.
FAQs
1) What is freight density?
Freight density is total shipment weight divided by total shipment volume. It is commonly expressed as lb/ft³ or kg/m³ and helps estimate how a carrier may rate and price the shipment.
2) Should I use inside or outside carton dimensions?
Use outside dimensions. Include pallets, stretch wrap, and any overhang because carriers rate the space your freight actually occupies on the trailer.
3) Why does the calculator show both lb/ft³ and kg/m³?
Carriers and warehouses use both imperial and metric systems. Showing both lets you compare international documents, labelling, and warehouse measurements without doing manual conversions.
4) Does higher density always mean a lower class?
Often, yes, but not always. Commodity type, handling, liability, fragility, and stackability can override density-based expectations and lead to a different class.
5) How do I calculate volume if I only know dimensions?
Select the dimensions method, enter length, width, height, and units. The tool multiplies L×W×H to get volume per package, then totals it by quantity.
6) What if my shipment has multiple different items?
Calculate each item type separately, then compare results. Mixed freight can have different densities and classes, and carriers may apply rules based on the highest class or how it is billed.
7) Why can my billed class differ from the estimate?
The class here is density-based and approximate. Carrier inspections, reweighs, remeasures, commodity details, and packaging factors can change the final class and charges.