Pallet Calculator

How the pallet calculator works

A pallet build has three limits: how many boxes fit in one layer on the deck, how many layers fit under the height limit, and how much weight the pallet, the boxes and the carrier will accept. The calculator works through them in that order and tells you which one stops you.

• Layer. It tries every box with its long side along the pallet, every box turned, and patterns that mix the two: a band of boxes one way and the rest of the deck filled the other way. That finds the classic 10-box layer of 16 × 12 cartons on a 48 × 40 pallet that a simple grid misses.
• Height. The maximum height includes the pallet deck. Layers are whole boxes; the calculator never counts a part layer.
• Weight. Maximum gross weight includes the empty pallet. If weight runs out before height, the top layer is partial and the label says so.
• Overhang. Allowing a little overhang per side enlarges the usable area, which sometimes adds a whole row. It also costs box strength and affects density, so the default is none.

Each layer uses the same pattern, stacked in columns. Column stacking keeps the corners of every box over the corners below, which is where corrugated boxes are strongest. Many warehouses rotate alternate layers to interlock them for stability; the box count is the same.

Standard pallet sizes

ISO 6780 lists six footprints for intercontinental use, including all of the above. Deck height and empty weight vary with the build and timber, so the calculator's defaults are typical values: change them under "Custom size" if you know yours.

Formula

Worked example: 16 × 12 × 10 inch cartons on a 48 × 40

A distributor ships 18 lb cartons measuring 16 × 12 × 10 inches on GMA pallets, with a 60-inch height limit and 2,000 lb maximum.

• A plain grid with the 16-inch side along the 48-inch edge fits 3 × 3 = 9 boxes and leaves a 4-inch strip. Turned the other way it fits 4 × 2 = 8.
• Mixed: one row of four boxes turned (12 inches along the 48, 16 inches deep) uses 16 inches of the 40, and the remaining 24 inches take two rows of three boxes lengthwise. That is 10 per layer and the deck is fully covered.
• Height: 60 in − 6 in deck = 54 in, so 5 layers of 10 inches. 50 cartons per pallet, 56 inches tall.
• Weight: 50 × 18 = 900 lb plus a 40 lb pallet = 940 lb, well within 2,000. Height is the limit.

The same cartons on a Euro pallet (1200 × 800 mm) fit only 5 per layer, so the Euro build carries 25 cartons at the same height. A carton sized for one pallet standard is rarely efficient on another, which matters for exporters shipping into Europe.

Pallet-building mistakes that cost money

• Overhang. Boxes hanging over the deck edge lose much of their stacking strength and are measured by LTL carriers at the outside edge, raising cube and lowering density.
• Underhang left as empty deck. You pay for the whole 48 × 40 footprint either way. If the layer covers 80 % of the deck, look for a box size that fills it.
• Building taller than the trailer or the customer allows. Many receivers and racking systems cap pallets at 60 or 72 inches, and a 53′ van's door opening is about 100–110 inches. Confirm before you build two-high.
• Ignoring box compression. The bottom box carries every box above it. Heavy products may need fewer layers than the height allows, or a tier sheet and corner boards.
• Using the wrong pallet for the destination. A 48 × 40 pallet does not fit European racking or a 2.4 m trailer the way Euro pallets do, and many retailers reject non-standard pallets.