Stackable vs non-stackable pallets: how packing changes your loading meters

On less-than-truckload (LTL) groupage, a carrier sells the trailer by the linear metre of floor it occupies. A standard semi-trailer is about 13.6 loading meters long and 2.4 metres wide, and your share of it — your loading meters, or LDM — is how much of that length your freight blocks for other cargo. The chargeable figure for an LTL shipment is the most limiting of its loading meters, its actual weight and its volumetric weight; for low-to-medium-density palletised freight, loading meters usually govern. For the weight side of that comparison, see our guide on chargeable weight.

What turns one pallet's footprint into one-or-two pallets' worth of billable space is stackability. If a second pallet can ride safely on top of the first, the two share a single footprint on the deck; if it cannot, each pallet blocks its own floor space and the air above it travels empty — and you pay for that air.

A pallet is stackable when another loaded pallet can be placed on top of it without damaging the goods or destabilising the stack. In practice that means a flat, rigid, load-bearing top surface; goods that can carry the weight of an identical pallet above them; an even, square-stacked load that does not overhang the pallet edges; and a stable centre of gravity. A pallet capped with a board or a strong top layer and shrink-wrapped square to the footprint is the classic stackable unit.

A pallet is non-stackable when putting weight on top would crush, dent or topple it — fragile or domed tops, pyramid-stacked or cone-loaded goods, fixtures and equipment with delicate upper surfaces, anything overhanging the pallet, or loads explicitly marked ‘do not stack’. Whether a pallet is stackable is a property of how it is built and loaded, not just what is inside it — which is exactly why it is a lever you control.

When a pallet cannot be stacked, the carrier cannot put anything above it, so that column of trailer — from the deck to the roof — is committed to your one pallet for the whole journey. The billing reflects that: a non-stackable pallet is charged for its full floor footprint as if it owned the height, regardless of how tall the pallet actually is. A 1.2-metre-high non-stackable pallet and a 2.2-metre-high one block the same column and cost the same in loading meters.

A stackable pallet, by contrast, shares its column. Two stackable pallets on one footprint split that floor space between them, so each is billed for roughly half the loading meters of the equivalent non-stackable pallet. That halving is the whole game, and it is why the same goods can carry very different prices depending on a single line on the booking.

Loading meters are the floor length a load occupies across the full trailer width. The formula is straightforward: LDM equals the footprint area in square metres divided by the trailer width of 2.4 metres. A standard EUR pallet is 1.2 by 0.8 metres. Placed with its 0.8-metre side along the trailer length, two EUR pallets sit side by side across the 2.4-metre width, so a single EUR pallet works out at about 0.4 loading meters: (1.2 × 0.8) ÷ 2.4 ≈ 0.4.

That 0.4 LDM is the non-stackable figure — one pallet, one footprint, full height. If the same pallet is stackable two-high, the pallet that rides on top adds no new floor space, so the pair still occupies 0.4 LDM and each pallet effectively costs about 0.2 LDM. Our CBM and loading-meter calculator builds this in: it halves the loading-meter contribution of any line you mark stackable, so you can see the difference immediately.

Take ten standard EUR pallets, each 1.2 by 0.8 metres, 220 kg, loaded 1.4 metres high. As non-stackable, each occupies its own 0.4 LDM footprint, so the load is 10 × 0.4 = 4.0 loading meters — nearly a third of a 13.6-metre trailer for ten pallets that are only chest-high. As stackable two-high, the ten pallets sit on five footprints, so the load is 5 × 0.4 = 2.0 loading meters.

At a representative LTL rate of, say, €40 per loading meter on the lane, that is roughly €160 non-stackable versus €80 stackable for the identical goods — the non-stackable declaration doubles the freight bill. The exact rate per LDM varies by corridor and is always confirmed in your written quote; the point is the ratio, not the euro figure. Note the weight cross-check too: at 2,200 kg total this load sits well under the loading-meter-implied weight, so loading meters govern here rather than weight — see the chargeable-weight guide for when the comparison flips.

Most accidental non-stackable surcharges come from how a pallet is finished, not from the product itself. Overhang is the commonest cause — cartons that spill past the pallet edge cannot take a pallet on top and snag in handling. A domed or uneven top layer, a pyramid or cone load, or a tall pallet with a high centre of gravity all read as non-stackable. So does omitting a top cap board on a load that would otherwise carry weight cleanly, or leaving the stretch-wrap loose so the stack can shift.

Mixed-height pallets in the same consignment cause a subtler version: if the carrier cannot pair them, the short ones lose their stacking partner. Where the goods genuinely cannot be stacked, the surcharge is legitimate and worth paying for damage-free delivery — but a large share of non-stackable freight is simply built that way out of habit. Squaring the load to the footprint, capping it, and wrapping it tight often converts a pallet back to stackable and halves its loading-meter cost.

Stackability is a field on the booking, so decide it deliberately. Mark a line stackable only if a loaded pallet of the same weight could sit on top without damage; mark it non-stackable when it genuinely cannot take the load, and expect to pay for the full column. Run your pallets through our CBM and loading-meter calculator with the stackable box set both ways to see exactly what the declaration costs you, then submit the quote form for a firm written price on your lane.

Calculator figures are indicative and meant for planning; the binding number is the one in your written quote, which reflects your actual pallets, the lane and the current rate. If you are not sure whether a load qualifies as stackable, describe it when you request the quote and we will tell you how it will be treated before you commit.