Pallet Load Pattern Calculator
Compare pallet load patterns — column stacks and mixed two-block layouts — see boxes per layer and area used, and get a top-view diagram of the best layer.
A pallet load pattern describes the carton arrangement on a layer. This calculator compares column stacks in both directions with mixed two-block patterns, selects the candidate with the most boxes, and draws a top view when readable. Compression strength and stability need separate checks.
How to use this tool
- Choose units and enter the pallet length and width.
- Enter the box length and width, and the box height if you want the layer count.
- Enter any overhang you allow per side (0 is best practice).
- Compare the patterns and use the diagram to build the first layer.
Formula
Column stack = ⌊PL ÷ l⌋ × ⌊PW ÷ w⌋, or ⌊PL ÷ w⌋ × ⌊PW ÷ l⌋ turned
Two-block = k × ⌊PW ÷ w⌋ + ⌊(PL − k × l) ÷ w⌋ × ⌊PW ÷ l⌋, for the best k
Area used (%) = boxes × l × w ÷ original pallet deck area × 100
PL and PW are the pallet length and width, l and w the box length and width. The two-block search is run along the length and across the width, and overhang adds twice its value to each pallet side. This finite pattern search does not guarantee the global maximum. Area percentage uses the original deck, so it can exceed 100% when overhang is allowed.
Example
For 16 × 12 in cartons on a 48 × 40 in pallet, a column stack fits 9 boxes lengthwise or 8 turned. The best two-block pattern puts two rows of three lengthwise boxes (24 in deep) beside one row of four turned boxes (16 in deep): 10 boxes, using 100% of the deck. A 180° alternate layer moves the turned row; actual support and stability require a load-specific check.
Frequently asked questions
Column stacking or interlocking?
Column stacking puts each box’s corners directly over the corners below, which usually improves compression strength for corrugated cartons. Interlocking ties the layers together and resists shifting, but corners then rest on the weaker middle of the panels below. Many shippers column-stack heavy loads and wrap them well.
How do I read the diagram?
It is a top view of one layer with the pallet length running left to right. L marks boxes with their length along the pallet length, T marks boxes turned 90°, and dots show empty deck.
Should I always use the pattern with the most boxes?
Usually, but not at any cost. A pattern that gains one box yet leaves gaps at the edges or loose columns can cause more damage than it saves in freight. Keep the outside faces flush with the pallet edges.
Sources
Last updated: 2026-10-30