How 2 Inches of Pallet Overhang Drops Your PCF Density & Costs 35% More in LTL Freight Class

How overhang is measured

Dimensioners and inspectors measure the handling unit, not the pallet. Length and width are taken at the widest point of whatever sticks out furthest. If a layer of cartons hangs an inch past the deck on every side, the 48 × 40 pallet is rated as 50 × 42. The pallet's nominal size does not matter, and neither does the fact that only the top tier overhangs.

For a 48 × 40 pallet:

Because density is weight divided by cube, the same percentages come off your PCF. One inch per side takes a pallet at 6.3 PCF down to 5.76 PCF; two inches per side take it to 5.29 PCF.

Worked example: four 60-inch pallets of boxed displays

Four stackable pallets, each 60 inches tall and 420 lbs gross, 1,680 lbs in total, on a 900-mile lane.

The math for the 1-inch case: 50 × 42 × 60 ÷ 1,728 = 72.92 cubic feet per pallet, 291.7 for four, and 1,680 ÷ 291.7 = 5.76 PCF, under the 6 PCF line, so class 175 instead of 125. On our indicative model the bill rises from about $363 to about $509, 40 percent more for the same freight, because the class factor rises from 1.25 to 1.75. On real carrier rate tables the gap between class 125 and class 175 is commonly somewhere around 30 to 40 percent depending on lane and weight break, which is where the 35 percent figure comes from. Treat it as indicative.

The half-inch case shows how thin the margin is: 6.02 PCF is class 125 by two hundredths. A dimensioner reading a little more height, or a slightly bowed carton, moves it. To get back to 6 PCF from the 1-inch case the load would need 70 lbs more product or 2.4 inches less height; far easier to pull the cartons back onto the deck.

Overhang also costs you in claims and floor space

• Damage. Overhanging cartons carry their load on unsupported edges. Corrugated loses much of its stacking strength when the corners are off the deck, and the overhanging edge is the first thing a forklift, a trailer wall or the next pallet hits. Carriers commonly treat overhang as inadequate packaging when assessing a damage claim.
• Linear feet. A 50-inch pallet takes 50 inches of trailer length, not 48. Ten pallets loaded two across take 20.8 feet instead of 20.
• Width. Two 44-inch-wide units side by side need 88 inches, which still fits a 98.5-inch van, but pinwheel patterns and mixed loads get harder.

The opposite problem, underhang, costs less but is still waste: a load that stops two inches short of the deck edge is rated at the full pallet size, so you pay for cube you do not use.

Packaging moves that raise density

1. Match carton footprint to the pallet. Pick carton sizes whose layer pattern fills 48 × 40 without overhang. A carton footprint that tiles 48 × 40 exactly is worth more than a carton that is slightly cheaper to buy.
2. Choose the smallest deck that supports the load. A 48 × 48 pallet under a 48 × 40 load adds 8 inches of width you pay for on every inch of height. Use 48 × 40, 42 × 42 or 40 × 40 decks where the product sits safely.
3. Cut void fill. Air inside cartons is rated exactly like product. Right-size cartons to the product and use less dunnage.
4. Build to a target height. Use the weight windows on the density chart: on 48 × 40, class 125 needs 320 lbs at 48 inches and 400 lbs at 60 inches. Build to the height that the pallet's weight supports at the class you want.
5. Keep the top flat and under 60 inches. A flat, rigid top under 60 inches can be stacked and is cubed at its real height. Over 60 inches, expect a 96-inch imputation.
6. Re-measure after wrapping. Wrap pulled tight can draw cartons in; wrap applied loosely can add an inch. The dimensions on the bill must be the finished ones; see the BOL checklist.

Where overhang shows up most

If the product truly cannot fit the deck, rate it on its real footprint and price modes that charge for floor space rather than class. A load of long, light panels often fits better on a custom skid or crate than on an overhung pallet.

Running an overhang audit on your own dock

Overhang is a habit, not an accident, so it is worth measuring how often it happens before deciding what to change. A one-week audit is enough for most shipping departments:

• Sample twenty finished pallets across your main SKUs and shifts. Measure length, width and height at the extreme points after wrapping, exactly as the BOL checklist describes, and weigh each one.
• Compare against the bill. For each pallet, note the dimensions your BOL template would have written. Most templates assume 48 × 40, so any overhang shows up as a gap.
• Compute density both ways. Work out PCF from the template dimensions and from the measured ones. Flag every pallet where the two land in different classes.
• Look at the boundaries. Pallets within about 0.3 PCF of a tier line (6, 8, 10 or 4 PCF, for example) are where an inch of overhang changes the class. Those SKUs get carton or pattern changes first.
• Check your re-bills. Pull the last quarter's W&I corrections and see how many cite a footprint wider than 48 × 40. That number puts a dollar figure on the habit.

The fix usually comes down to a handful of SKUs whose cartons do not tile the deck. Changing one carton dimension or one layer pattern for those SKUs removes most of the overhang across the whole shipping program.

When the carrier measures overhang you did not ship

Sometimes the overhang on the W&I report is not real: a pallet carried tilted on the forks, a wrap tail flapping in the dimensioner field, or cartons that shifted in transit after the pallet left your dock. Photos taken at your dock with a tape measure in frame, showing the load flush with the deck, are the evidence that wins those. Recompute the class with your true dimensions first; if the overhang did not change the class, it is not worth the dispute. The W&I dispute guide has the procedure.

Frequently asked questions