This pallet calculator answers the question that decides a shipment's cost: how many cartons actually go on one pallet, once the footprint, the height limit and the weight limit have all had their say. Getting it wrong by one layer changes the pallet count, and the pallet count is what freight is priced on.
Arb Digital publishes this in a free tools library aimed at people who need a defensible number rather than a rough guess. The calculation is deliberately conservative: cartons stay upright, only the footprint rotates, and the binding constraint is named so you know which limit to argue with.
What This Pallet Calculator Does
It works in three stages. First it fits cartons onto the deck footprint, trying several patterns and keeping the best. Then it stacks layers upward until either the height limit or the weight limit stops it. Finally it reports the total, the loaded height, the gross weight and how much of each limit the result consumes.
The three bars are there because the useful information is usually which constraint binds. A pallet that fills 98 per cent of its weight limit and 60 per cent of its height is a dense product, and the fix is a lighter carton or a higher weight allowance — adding height achieves nothing. The reverse case is a light bulky product, where a taller allowance immediately adds layers.
The boundary with the neighbouring tool is simple and worth stating. This page puts cartons onto a pallet. The container loading calculator puts pallets into a shipping container, which is the next step up the chain. Run this one first to get pallets, then run that one to get containers. For pure cubic volume with no stacking pattern at all, the CBM calculator is the right tool.
How to Use It
- Enter the carton's outside dimensions. Use the shipping carton, not the retail box, and include any tape or wrap that adds bulk.
- Enter the pallet footprint and deck height. A standard North American pallet is 48 by 40 inches with a deck around 5.5 inches; a common European footprint is 120 by 80 centimetres.
- Set the height and weight ceilings. These come from your carrier, your racking or your trailer door, and they are the numbers that actually limit the load.
- Set overhang to zero unless you are sure. Most carriers and most racking systems do not accept it.
- Read which limit binds. The result line names it, and the bars show how much headroom is left on the other two.
The Formula: How the Fit Is Calculated
For one layer, the tool tests four arrangements and keeps whichever holds the most cartons. Two of them are uniform: cartons all lengthwise, giving floor(pallet length ÷ carton length) × floor(pallet width ÷ carton width), or all crosswise, giving floor(pallet length ÷ carton width) × floor(pallet width ÷ carton length). The other two are split patterns, where part of the deck is filled one way and the leftover strip is filled with rotated cartons — the tool sweeps every possible split point along each axis and keeps the best.
Layers then come from two independent caps. The height cap is floor((maximum height − pallet deck height) ÷ carton height). The weight cap is floor((maximum gross weight − empty pallet weight) ÷ (cartons per layer × carton weight)). The number of layers is the smaller of the two.
Worked example, which is the default on this page. A 12 by 10 by 8 inch carton weighing 20 pounds, on a 48 by 40 inch pallet with a 5.5 inch deck weighing 40 pounds, under a 60 inch height limit and a 2,200 pound weight limit. Lengthwise gives floor(48 ÷ 12) × floor(40 ÷ 10) = 4 × 4 = 16 cartons per layer, and no other pattern beats it. Height allows floor((60 − 5.5) ÷ 8) = floor(6.81) = 6 layers. Weight allows floor((2,200 − 40) ÷ (16 × 20)) = floor(6.75) = 6 layers as well. Six layers of sixteen is 96 cartons, a loaded height of 5.5 + 48 = 53.5 inches and a gross weight of 96 × 20 + 40 = 1,960 pounds. Deck area used is 16 × 120 = 1,920 square inches out of 1,920 available, a perfect 100 per cent fit.
Why a Perfect Fit Is Rare, and What to Do About It
That 100 per cent example is unusual. Most carton sizes leave a strip of dead deck, and the waste compounds: a two-inch gap along a 48-inch pallet is four per cent of the footprint on every layer of every pallet you ever ship. Over a year that is real money in freight.
The fix is almost always to change the carton, not the pattern. If you are designing packaging, work backwards from the pallet: choose carton dimensions that divide the deck evenly, and the fit takes care of itself. On a 48 by 40 inch deck, cartons of 12 by 10, 16 by 10, 24 by 20, 12 by 8 and 16 by 20 inches all tile exactly. On a 120 by 80 centimetre deck, 40 by 30, 60 by 40, 30 by 20 and 24 by 20 centimetres do the same.
Where the carton is fixed, the split patterns this tool tests are where the remaining gains live. Rotating a strip of cartons in the leftover space frequently adds one or two units per layer, which over six layers is another six to twelve cartons on the same pallet. That is why the mixed-pattern option is the default; switch to fixed orientation only when the product genuinely cannot be turned, such as printed cartons that must all face out.
Height, Weight and Which One Really Binds
Height limits come from more places than people expect. A trailer door, a container door, the clear height of a racking bay, the reach of a forklift mast, and any double-stacking plan all impose their own ceilings, and the lowest one governs. Common shipping ceilings sit in the region of 48 to 60 inches loaded for double-stacked freight and higher for single-stack, but the only number that matters is the one your own operation uses.
Weight limits are stricter than most people realise, and they come in layers too. The pallet itself has a rated capacity. The racking has a beam rating. The forklift has a capacity that falls as the load centre moves out. And the total shipment has a legal vehicle weight limit behind it. This calculator applies one gross weight ceiling, which should be the lowest of all of those, not the most generous.
When weight binds before height, you have a dense product and a half-empty column of air above it. Some shippers respond by building a shorter, heavier pallet and using the vertical space for a second lighter pallet stacked on top — which only works if the lower load can carry the upper one. Compression strength is a property of the specific corrugated board and the specific stacking pattern, and it is tested rather than calculated from dimensions. The material weight calculator can help you get from a volume of product to a carton weight if that figure is the one you are missing.
Column Stacking Versus Interlocking
A column stack puts every carton directly above the one below, so the vertical corners line up all the way down. A corrugated carton takes most of its compression strength through those corners, so a column stack is markedly stronger. The trade-off is stability: columns can shear sideways in transit and rely on wrapping or strapping to hold together.
An interlocked or brick pattern rotates alternate layers so cartons bridge the joints below. That binds the load together mechanically and resists shifting, but it puts carton corners onto the flat faces of the cartons below, which is where corrugated board is weakest. Published guidance on this trade-off generally puts the compression loss from interlocking in the tens of per cent, which is why heavy loads are usually column stacked and wrapped rather than interlocked.
This calculator counts positions, not strength. It will happily tell you that six layers fit, and it has no way of knowing whether the bottom layer can carry the five above it. That question is answered by testing — the ISO family of pallet standards covers the test methods, and carton compression is tested separately by the box supplier.
Pallet Sizes, Standards and Why They Vary
There is no single world pallet. The 48 by 40 inch pallet dominates North America, the 1200 by 800 millimetre pallet dominates Europe, and 1100 by 1100 millimetre is common in parts of Asia. The principal dimensions and tolerances for internationally traded flat pallets are set out in ISO 6780, Flat pallets for intercontinental materials handling, which is the reference to check when a customer specifies a footprint rather than a size in inches.
Structural performance is a separate standard again. ISO 8611-1, Pallets for materials handling — Flat pallets — Part 1: Test methods defines how a pallet's load capacity is actually determined, which is worth knowing because a pallet's rated capacity is a tested figure and not something you can infer from its dimensions or its timber.
One more practical point: wooden pallets crossing international borders are subject to phytosanitary treatment requirements, and an untreated pallet can have a shipment refused at the port. That is a documentation matter rather than an arithmetic one, but it is the most common reason a correctly calculated pallet still fails to travel.
Arb Digital's free tools library covers the pricing, margin and logistics maths behind ecommerce, and our team is happy to talk through anything the tools cannot answer.
Browse Free Tools Talk to Arb DigitalCommon Mistakes to Avoid
- Using the retail box dimensions — the shipping carton is bigger, and the difference is often enough to lose a column per layer.
- Forgetting the pallet's own height and weight — the deck eats several inches of your height limit and the timber eats tens of pounds of your weight limit.
- Assuming overhang is acceptable — most carriers and racking systems refuse it, and an overhanging carton loses much of its compression strength.
- Treating the best-fitting pattern as the best pattern — an interlocked layer that fits one more carton may not survive the stack weight above it.
- Ignoring which limit binds — raising a height allowance does nothing at all for a load that is already at its weight limit.
Related Free Tools From Arb Digital
Use the container loading calculator to load the finished pallets into a container, the CBM calculator for cubic volume alone, the freight class calculator for density-based freight classification, the shipping cost per item calculator to turn a shipment cost into a per-unit figure, and the volume converter for unit changes. Everything else is in the free online tools hub.
Frequently Asked Questions
It depends entirely on the carton. A 12 by 10 inch carton tiles a 48 by 40 inch deck exactly at 16 per layer, while a carton an inch larger in either direction may drop to 12. Enter your own dimensions rather than relying on a rule of thumb.
No. Cartons are always kept upright and only the footprint is rotated, because most products have a required orientation and turning a carton on its side changes which faces carry the load.
The lowest ceiling that applies to your load — trailer or container door, racking bay clear height, or whatever your customer specifies. The pallet's own deck height is subtracted from it automatically.
Generally not. Many carriers and racking systems do not accept overhanging loads, and a carton hanging past the deck edge loses much of its compression strength because its corners are unsupported.
Because the product is dense. Adding height allowance will not add layers in that case; only a lighter carton or a higher weight ceiling will. That is exactly what the three bars are there to show.
A column stack is stronger because corrugated board carries compression through its corners. An interlocked stack is more stable in transit but sacrifices a substantial share of that strength, which is why heavy loads are usually columned and wrapped.
This page fits cartons onto one pallet. A container loading calculator fits finished pallets into a shipping container. They are consecutive steps, and you normally run this one first.
No. It counts positions and applies the limits you enter. Carton compression strength depends on the board specification and the stacking pattern and is established by testing, not by dimensions.
This tool performs geometric and arithmetic estimation from the dimensions you enter. It does not assess structural strength, load stability or transport safety, and it does not certify compliance with any carrier, racking or regulatory requirement. Confirm any load that matters against your carrier's rules and your packaging supplier's tested specifications.
