Shipping and logistics
Pallet layer and stack calculator
Compute cases per layer, complete layers, total cases and payload for a uniform rectangular pallet pattern, capped by your stacking height and weight limits.
This calculator finds how many identical cases fit a single pallet using one uniform rectangular grid, testing both case orientations and keeping the larger layer. It then caps complete layers by available stacking height and payload limit. It assumes no overhang and does not check compression strength.
Use this tool
Inputs stay in this tab. Results are planning estimates.
Downloads a plain text report of your inputs, results and limitations.
What the calculator does
You enter one case size and one pallet size, plus the space and weight available. The tool builds a layer pattern two ways: with the case length running along the pallet length, and with the case rotated 90 degrees. It keeps whichever orientation yields more cases per complete layer, then stacks identical layers until height or weight stops it.
Every case is assumed to be the same rectangular box, placed flat in the same orientation within its layer. The result is a count for a single uniform pattern, not an optimized mixed layout.
Inputs to enter
All dimensions are in inches and weights in pounds. Use packed carton dimensions, not the product inside.
- Case outer length, width and height.
- Pallet length and width at the deck surface.
- Available height above deck, which excludes the pallet itself, so 48 means 48 inches of cases.
- Case weight per packed case.
- Payload limit for the load only, excluding pallet tare.
How the layer count is chosen
For the first grid, the tool divides pallet length by case length and pallet width by case width, discarding fractional remainders, then multiplies the two counts. For the second grid it swaps the case dimensions. The larger result becomes cases per complete layer, reported as Ti.
The preferred grid line tells you which orientation won. When the two orientations tie, the tool reports length along pallet length. If no case fits flat on the deck in either orientation, the layer count and total are zero.
How layers are capped
The tool computes two ceilings. The height ceiling is available height divided by case height, rounded down. The weight ceiling is the payload limit divided by the weight of one full layer, which is the layer count times case weight, also rounded down. The smaller ceiling becomes the number of complete layers, reported as Hi.
Because the weight ceiling uses full layers, the tool never stacks a partial layer. If your payload limit allows five and a half layers, you get five. Total cases per pallet is Ti times Hi, and the payload line shows that total times case weight.
Worked example: default scenario
Enter a 12 by 10 by 8 inch case weighing 20 pounds on a 48 by 40 inch pallet, with 48 inches above the deck and a 2000 pound payload limit. Along the pallet length, four 12 inch case lengths fit 48 inches and four 10 inch widths fit 40 inches, giving 16 cases per layer. Rotated, four widths fit the length but only three lengths fit 40 inches, giving 12, so the straight grid wins.
The height ceiling is 48 divided by 8, or six layers. One layer weighs 320 pounds, so the weight ceiling is 2000 divided by 320, or six layers. Both agree, so the pallet holds 96 cases at 1920 pounds, with length along pallet length as the preferred grid.
Worked example: tighter payload limit
Keep every input the same but lower the payload limit to 1000 pounds. The footprint calculation is independent of weight, so Ti stays at 16. The height ceiling is still six layers, but the weight ceiling drops to 1000 divided by 320, or three layers.
Three is the smaller ceiling, so the pallet now holds 48 cases at 960 pounds. This shows why a weight change can cut the total even when geometry has not changed: the binding constraint moved from height to payload.
Edge case: a case that will not fit flat
Suppose the case length exceeds the pallet length and the case width exceeds the pallet width, so neither grid places even one case on the deck. Both layer counts come out zero, and the tool reports zero layers, zero cases and a zero payload rather than attempting an angled or overhanging placement.
This reflects the model's explicit assumption: cases sit flat, aligned to the pallet edges, with no overhang. If neither grid fits, resize the case or pallet or obtain a separately engineered layout. The tool does not authorize an angled arrangement or overhang.
Reading the results in practice
Treat the output as a planning figure for a single uniform pattern. If you need more cases per pallet, a mixed layout combining both orientations in one layer, or pinwheel patterns, can sometimes beat a single grid, which is why the results note that mixed layouts may fit more.
The payload figure excludes the pallet's own weight, so if a forklift or rack limit applies to the total, subtract the pallet tare before entering it. The height figure starts at the deck, so account for pallet height separately when checking doorway or rack clearance.
Compression capacity is a separate check. Stacking six layers tells you the geometry fits, not that the bottom case can carry the weight above it, so verify carton stacking strength independently.
Questions about pallet layer and stack calculator
Why does the calculator only test two orientations instead of optimizing the pattern?
The tool evaluates one uniform rectangular grid in each of its two rotations and keeps the larger layer count. Mixed patterns that combine orientations, pinwheels, or deliberate overhang can sometimes fit more cases, but they are outside this calculator's model, which is why the results note that mixed layouts may fit more.
Should the payload limit include the weight of the pallet itself?
No. The payload limit field is defined as the load excluding pallet tare, so enter only the weight the cases may add. If your equipment or rack rating applies to the total combined weight, subtract the pallet's own weight from that rating first, then enter the remainder.
Why did my total drop when I only changed the case weight or payload limit?
The weight ceiling is the payload limit divided by the weight of one complete layer, rounded down. A heavier case or lower limit can reduce that ceiling when the rounded-down layer count crosses a whole-layer boundary. The tool uses the smaller of the height and weight ceilings. When weight becomes the binding constraint, the total falls even though the layer pattern is unchanged.
Does a higher stack mean the bottom cases are strong enough?
No. The calculator checks only whether the geometry fits within the available height and whether the payload stays under the limit. Whether the bottom carton can bear the compressive load of the layers above it is a separate check that this tool does not perform.
Sources and further reading
- Original worksheet method: The original calculation or decision rules, units, examples and limitations are explained on this page; this is not an external performance standard.