Freight cubing solutions: what dimensioners do, how to choose one, and the free way to start

Freight cubing is measuring the space a shipment takes and recording it the same way every time. It matters because density drives freight class for many LTL items, and because carriers and shippers both price space. A freight cubing solution, usually a dimensioning device with software, does it in seconds and keeps a record. This guide explains what those systems do, the criteria to compare them on, and the free manual method that gets most small shippers accurate numbers without one. We don't rank products; we haven't tested them, and the right one depends on your freight.

The manual method is laid out below: measure one pallet, see its cube and density, then lay the shipment on the trailer floor.

What a freight dimensioner does

A dimensioner measures the outer dimensions of a pallet, crate or package, usually with cameras, depth sensors or lasers, and calculates its cube, normally the smallest box that contains it. Many integrate a scale, so one pass records dimensions and weight, and therefore density. Many also take a photo, which is useful when a carrier disputes a measurement. The data goes into shipping, warehouse or transportation software to print labels, estimate class, plan loads and support invoices.

Types of cubing systems

• Static stations: the freight sits on a platform under the sensor. Accurate and fast for pallets that come to one place.
• Forklift-mounted: sensors on the forklift measure as the pallet is moved. Saves a stop, with some trade-off in accuracy.
• Handheld or mobile: a device or phone app measures freight wherever it is. Flexible, best for occasional use.
• Parcel dimensioners: for packages on conveyors, common in parcel operations rather than LTL.
• Cubing software alone: works from measurements you enter, for load planning and class estimates without a device.

Criteria to compare them on

1. Accuracy at your sizes: test with your own freight, including odd shapes and shrink-wrapped pallets.
2. Approval for commercial use: if you'll bill from the measurement, check that the device is approved for that use under your state's weights and measures rules.
3. Speed: seconds per pallet matters at a busy dock.
4. Weight capture: an integrated, calibrated scale gives density in one pass.
5. Photos: a picture with every measurement settles disputes.
6. Integration: does it feed your shipping, warehouse or transportation system without manual entry?
7. Footprint and environment: space at the dock, cold, dust and forklift traffic.
8. Total cost: purchase or lease, installation, support, software fees and calibration.

Ask each maker for a demonstration on your freight and for references from operations like yours, and record the date of any pricing they give you.

The free manual method

Most small shippers can get accurate numbers without a device:

• Measure each piece at its longest, widest and tallest points, with the pallet, rounded up to the next inch. Measure the overhang, not the pallet's edge.
• Weigh on a certified or calibrated scale, pallet and packaging included.
• Photograph each side with a tape measure in the shot.
• Record the numbers on a simple sheet or in the trailer cube calculator for volume, and the density calculator for class.
• Repeat the same way every time, so your numbers are consistent even if they're not perfect.

That method, done consistently, catches most of the errors that lead to reclasses. The bigger errors come from guessing, not from using a tape.

A worked example

That's an EXAMPLE. Notice the overhang: measuring the pallet's 48 × 40 footprint instead of the cartons would understate the cube, and that's the kind of error a carrier's dimensioner catches.

When a dimensioner pays for itself

The case for a device comes down to a few numbers you can track. Count your reclasses and inspection fees over a few months. Estimate the staff time spent measuring by hand. Add the cost of disputes you lost because you had no photo or record. If that total, over the life of the device, is larger than its full cost with support and calibration, the device pays. If you ship a few pallets a week and reclasses are rare, the manual method is probably enough. If you ship dozens a day, or reclasses keep appearing, a dimensioner usually earns its place quickly.

Rolling out a cubing process

1. Pick one method and write it down: where to measure, how to round, how to weigh.
2. Train everyone who builds or ships pallets on the same method.
3. Record every shipment, with photos, against its bill of lading.
4. Compare with carrier bills each month and look for patterns in any differences.
5. Fix the cause, whether it's a packaging habit or a measuring habit.

The process matters more than the tool. A dimensioner used inconsistently gives inconsistent data; a tape used the same way every time gives numbers you can defend.

Common measuring mistakes

• Measuring the pallet instead of the cartons that overhang it.
• Forgetting the pallet's own height.
• Rounding down instead of up.
• Measuring a leaning stack at its narrowest point.
• Weighing on an uncalibrated or approximate scale.

Cubing, density and freight class

For LTL items that use the density scale, the cube is half the class calculation. A cubing solution that records dimensions and weight gives you density on every shipment, which is the basis for estimating class. Our guide to freight class explains how density maps to classes and why the item and the carrier's tariff have the final word. Shippers that negotiate a single class for mixed freight, called freight all kinds, still benefit from cubing, because the agreement often depends on average density staying within a range.

Cubing and the bill of lading

The measurements only help if they reach the paperwork. Put the piece count, the dimensions where the carrier asks for them, the weight and the NMFC item and class on the bill of lading, taken from the same record you measured. Many carriers now ask for dimensions on LTL bookings, because their own dimensioners will check them at the terminal. A bill of lading that matches what the carrier measures goes through without a rebill; one that doesn't starts a dispute you have to win with photos.

Packaging is part of the cube

The cube a dimensioner records is the cube of what you built. Pallets with overhang, uneven stacks or loose top layers measure bigger than the product needs. Our packaging and palletizing guidelines (coming soon) show how to build pallets that are stable and compact, which lowers the cube and often the class.

Cubing for carriers and load planning

Carriers think in floor space and payload rather than class. Knowing the cube of each shipment tells a carrier how much floor a partial load will take and whether a second partial can ride with it. For the trailer and truck dimensions that cube has to fit into, see our guide to freight truck sizes.

What to check and document

Partial freight pays best when someone checks it fits. Our dry van dispatch desk matches loads to your floor and payload, and you approve every load. Send an application.