How many boxes fit on a pallet? Pallet patterns explained

Why the number matters

Freight is almost never priced by the individual unit. It's priced by the pallet, the linear foot of trailer, the full truckload, or a dimensional weight that rewards a dense load. So the count of cases you fit on a pallet is the hinge that converts a freight quote into a cost per unit. Fit one more layer, or a few more cases per layer, and every unit on the truck gets cheaper. Lose a layer to a case that's an inch too tall, or a load that hangs over the deck, and you're paying to ship air.

That one number ripples outward: it decides how many pallets a purchase order becomes, whether a shipment is one truck or two, and how much load your product's box strength has to bear. It's part of our complete guide to packaging logistics.

The standard pallet: the GMA 48×40

In North America, most conversations start from one footprint: the GMA pallet, named for the Grocery Manufacturers Association that standardized it. It measures 48 inches by 40 inches (roughly 1219 × 1016 mm), typically a hardwood stringer or block pallet notched for four-way forklift entry. It's the most common deck in the region, which is why "boxes per pallet" is usually shorthand for "boxes on a 48×40."

It is not the only size, and assuming it can quietly break your math. Other footprints in regular use include 42×42 and 48×48 (common for drums), plus the Euro pallet at 1200×800 mm and the 1200×1000 mm block pallet. Big-box retailers and distribution centers often mandate a specific pallet and a maximum load height on inbound freight, so optimize for the deck your customer actually receives on — confirm it before you count.

Ti and Hi: the two numbers that decide everything

Every pallet count reduces to two figures. Ti — short for tier — is how many cases fit in a single layer sitting flat on the deck. Hi is how many of those layers you stack on top of each other. Multiply them and you have the pallet:

Cases per pallet = Ti × Hi.

Ti is a two-dimensional packing problem — fitting rectangles onto the deck. Hi is a one-dimensional stacking problem, capped by height and weight. Solve each and the total falls out.

A worked example (illustrative only)

Let's run the numbers on an example — yours will differ, so treat this purely as an illustration of the method. Say you have a case that measures 12 inches by 10 inches on the ground and stands 9 inches tall, and you're loading it onto a 48×40 GMA pallet.

Find Ti. Lay the 12-inch side along the pallet's 48-inch length: 48 ÷ 12 = 4 cases. Lay the 10-inch side along the 40-inch width: 40 ÷ 10 = 4 cases. That's 4 × 4 = 16 cases in a single layer. Because 12 and 10 divide 48 and 40 exactly, this layer uses the entire deck with nothing left over — so 16 is the most this case will ever fit per layer, no clever pattern beats it.

Find Hi. Now the height. Suppose your operation caps the load at about 54 inches of product — leaving clearance under a standard trailer roof and keeping the stack stable. At 9 inches per case: 54 ÷ 9 = 6 layers.

Multiply. Ti × Hi = 16 × 6 = 96 cases per pallet. If each case holds 24 units, that's 2,304 units riding on one pallet — and that unit count is exactly what turns a per-pallet freight rate into a cost per unit.

Step	Figure
Pallet footprint	48 × 40 in (GMA)
Case footprint	12 × 10 in
Cases along the 48 in side	48 ÷ 12 = 4
Cases along the 40 in side	40 ÷ 10 = 4
Ti (cases per layer)	4 × 4 = 16
Case height	9 in
Load height cap	~54 in
Hi (layers)	54 ÷ 9 = 6
Cases per pallet	16 × 6 = 96

Most real cases don't divide the deck so neatly. When they don't, you rotate some cases, mix orientations within a layer, or accept a little wasted deck — which is where the pattern you choose starts to matter.

Column vs interlocked: the pattern trade-off

Once cases are on the deck, there are two families of stack pattern, plus a hybrid:

• Column stack — every case sits squarely on the one below, corners and walls aligned all the way up the load, like pillars.
• Interlocked (brick) — each layer is rotated, usually 90°, so cases straddle the seams of the layer beneath and tie the load together.
• Pinwheel — a rotational variant that interlocks a layer while keeping corners closer to aligned, often leaving a small void in the middle.

The reason to care is a genuine trade-off between strength and stability. A corrugated box carries compression best down its vertical edges and corners; that's where the board is stiffest. Column stacking keeps every corner loaded straight onto the corner below, so it preserves the most of the box's compression strength. Interlocking sacrifices that — a case bridging two boxes below can't send its load cleanly down the corners — in exchange for a load that resists shifting and leaning without much help.

Pattern	Strength	Cube	When
Column stack	Highest — compression runs straight down aligned corners	Best — tightest fit, most cases per layer	Heavy or compression-sensitive loads; unitized with stretch wrap or strapping; rack or floor storage
Interlocked / brick	Lower — cases bridge seams, so top load isn't carried corner-to-corner; can shed a large share of stack strength	Similar to slightly lower	Loads that must resist shifting in transit with minimal wrap; lighter or robust product
Pinwheel	Between the two — interlocks while keeping corners nearer aligned	Can leave a small center void	Certain footprints where you want interlock and reasonable strength together

How much strength does interlocking give up? The commonly cited rule of thumb is up to roughly half versus a clean column stack — enough that it should be a deliberate choice, not an accident of habit. That stack strength is what your box's box compression test (BCT) has to beat over the load's whole life, with safety margins for humidity, storage time, and rough handling. Many operations split the difference: column-stack for strength and rely on stretch wrap, corner boards, and load straps for stability, or interlock only the top layer or two to lock the cap in place.

Overhang and underhang: match the load to the deck

The goal is a load flush with the pallet edges. Missing in either direction hurts.

Overhang — cases hanging past the deck edge — is the more expensive mistake. An overhanging box has unsupported corners, precisely the part that carries compression, so stacking strength drops sharply; a commonly cited estimate is that even an inch of overhang can cost up to about a third of a box's compression strength. Overhanging cases also get crushed, snagged, and torn as loads brush past each other and against racking.

Underhang — a load smaller than the deck — looks safe but isn't free. It wastes cube: you're paying to ship empty pallet. It also undermines stability, because in a double-stacked or racked situation the corners of the load above land on unsupported pallet edges instead of on solid boxes, and a load that doesn't fill its footprint is freer to shift and lean. Aim to fill the deck as fully as the case size allows.

Height and weight: the ceilings on Hi

Hi isn't simply "how many layers fit under the roof." Three separate ceilings compete, and the lowest one wins:

• Vehicle height. A dry-van trailer interior is typically around 108–110 inches. If you want to double-stack pallets inside the trailer, each load has to be roughly half that. Containers and air freight impose their own limits.
• Racking and DC rules. Warehouse rack openings cap load height, and receiving distribution centers frequently mandate a maximum pallet height (product plus pallet) and a maximum weight per pallet for safe handling.
• Stack strength. The bottom boxes must carry everything above them for the entire time in storage. As the stack gets taller and heavier — and as humidity and time slowly weaken the board — the safety margin shrinks. This is the ceiling that connects directly to your board grade and BCT.

Weight has the last word too. Pallets are commonly kept under a practical weight for forklift and racking safety, and the trailer's legal payload caps the total across every pallet on board. Treat all of these as typical guidelines that vary by carrier, facility, and region — always confirm the limits that apply to your lane.

How software solves the fit

Working one case by hand is easy. Doing it across a whole catalog — many SKUs, several pallet types, and every constraint above — is a genuine optimization problem. Palletization and load-optimization tools (also called cube optimization, cartonization, or 3D bin-packing) search across case orientations and stack patterns to maximize cases per pallet subject to real limits: overhang tolerance, maximum height and weight, per-layer weight, and whether the product may be interlocked or must be column-stacked. A good optimizer also respects crush and BCT, so it won't hand you a dense pattern that fails on the road. What comes out is a Ti-Hi, a layer pattern, a load height and weight, and a pallets-per-shipment count.

How PackOS computes packout and pallet build

PackOS carries the case-and-pallet math straight through the quote instead of leaving it for a spreadsheet later. From the case dimensions it detects or derives, it computes the packout — units into cases, cases into shipper cartons — and the pallet build: Ti-Hi, the stack pattern, load height and weight, and pallets per shipment. Because that rolls into freight, you see cost per unit, not just per pallet, before you commit to an order — and if you change the case size or the pallet, the whole load re-solves. You can see the logistics engine on the technology page, or run it on a real file with Quick Quote.