Pallet Configuration Calculator NZ: How to Work It Out

A pallet configuration calculator for New Zealand works out how many cartons, bags or boxes fit on a standard pallet and how high you can stack them, based on pallet size, load dimensions and weight limits. You enter your pallet footprint, your carton or bag size, and the maximum stack height or weight, and it returns the number of units per layer, layers per pallet, and total units per pallet. This is a practical planning tool for freight, warehousing and export packing, and it uses the same maths you would do by hand.

Formula

The calculator uses simple integer arithmetic. For each layer, you find how many cartons fit along the pallet length and width, then multiply those two numbers:

Units per layer = floor(pallet length ÷ carton length) × floor(pallet width ÷ carton width)

Layers = floor(maximum stack height ÷ carton height)

Total units per pallet = Units per layer × Layers

Where:

• Pallet length and width are the usable deck dimensions in millimetres (mm).
• Carton length, width and height are the external dimensions of one carton in millimetres.
• Max stack height is the total height you allow for the load, including any pallet height if you measure from the floor.
• floor() means you round down to the nearest whole number – you cannot fit a partial carton.

The result is the theoretical maximum. Real-world packing often has gaps, overhang, or orientation constraints that reduce the count.

Worked Example

Using the default values from the calculator above:

• Pallet: 1200 mm × 1000 mm
• Carton: 400 mm × 300 mm × 250 mm
• Max stack height: 1500 mm

Step 1 – units per layer:

Along length: 1200 ÷ 400 = 3. Along width: 1000 ÷ 300 = 3.33, floor to 3. So 3 × 3 = 9 cartons per layer.

Step 2 – layers:

1500 ÷ 250 = 6 layers.

Step 3 – total:

9 × 6 = 54 cartons per pallet.

The calculator shows 9 per layer, 6 layers, 54 total. That matches the hand calculation.

Note: if you measure stack height from the floor, you must subtract the pallet height first. A typical NZ pallet is 150 mm tall, so the usable height would be 1500 − 150 = 1350 mm, giving 5 layers (1350 ÷ 250 = 5.4).

Why Pallet Configuration Matters in New Zealand

New Zealand uses a mix of pallet standards. The most common is the Australian Standard Pallet at 1165 mm × 1165 mm, but many exporters use the ISO pallets: 1200 mm × 1000 mm (Europe) and 1200 mm × 800 mm (Europe/Asia). Domestic freight often uses 1200 mm × 1000 mm or the older 1100 mm × 1100 mm. Knowing which pallet your freight company or destination country uses is the first step, because the same carton yields different counts on different pallets.

For example, a 400 mm × 300 mm carton fits 9 per layer on a 1200 × 1000 pallet, but only 8 per layer on a 1165 × 1165 pallet (2 along each side = 4, but you can fit 2 along one side and 3 along the other? Actually 1165 ÷ 400 = 2.9, so 2; 1165 ÷ 300 = 3.88, so 3; 2 × 3 = 6). That is a 33% difference in pallet utilisation, which directly affects freight cost per unit.

How to Use the Calculator Correctly

To get a realistic number, follow these steps:

1. Measure the actual external dimensions of your carton or bag – do not use nominal sizes.
2. Decide whether the carton can be rotated on the pallet. Some calculators allow orientation changes, but this one assumes a fixed orientation. If you can rotate, you may fit more – try both orientations manually.
3. Set the maximum stack height based on your pallet racking, truck trailer internal height, or the load limit of the bottom carton.
4. Subtract the pallet height if your height limit is from the floor.
5. Check the weight: even if the cartons fit geometrically, the total weight may exceed the pallet’s safe working load (typically 1000–1500 kg for a standard wooden pallet).

The calculator gives a geometric maximum. It does not account for overhang, which is usually limited to 25 mm per side, or for the need to leave space for stretch wrap or banding.

Common Mistakes and Misconceptions

One frequent error is mixing units – entering pallet size in millimetres and carton size in centimetres. Always convert to the same unit. Another is forgetting that the stack height includes the pallet itself. A 1500 mm height limit with a 150 mm pallet leaves only 1350 mm for cartons.

A common misconception is that you can always rotate cartons to fit more. Rotating works only if the carton’s footprint is not square and the pallet dimensions allow it. For example, a 400 × 300 carton on a 1200 × 1000 pallet: if you rotate every carton, you get floor(1200÷300) × floor(1000÷400) = 4 × 2 = 8 per layer, which is less than the 9 you get without rotation. So rotation is not always better.

Another mistake is assuming the floor() function is optional. You cannot fit 3.33 cartons along a side – you must round down. The calculator does this automatically.

Pallet Types and Their Dimensions

New Zealand uses several pallet types, each with a different usable area:

• Australian Standard (AS 4068): 1165 mm × 1165 mm – common in trans-Tasman trade.
• ISO Pallet (1200 × 1000): the most common in Europe and increasingly in NZ export.
• ISO Pallet (1200 × 800): common in Europe, often called the Euro pallet.
• Custom pallets: often 1100 × 1100 or 1200 × 1200 for specific industries.

The pallet’s actual deck may be slightly smaller than the nominal size due to board gaps. Measure the usable surface, not the overall footprint, for accuracy.

Weight Limits and Load Stability

Geometric fit is only half the story. The total weight of the loaded pallet must not exceed the pallet’s rated capacity, which for a standard wooden pallet is usually around 1000–1500 kg. Also, the bottom carton must withstand the compression of the layers above. A typical corrugated box can handle a certain stacking strength, but it varies widely. If the cartons are heavy, you may need to reduce the number of layers even if the height allows more.

Load stability also matters. If the cartons do not fill the pallet completely, you may need to add dunnage or use a different arrangement. The calculator assumes a perfect grid, but real loads often have gaps at the edges.

Alternatives and Related Tools

If you need to optimise pallet loading, you can try a pallet pattern generator that tests multiple orientations and finds the best arrangement. Some software also considers weight distribution and overhang. For simple calculations, this calculator is sufficient. If you are working with bags or drums, the same formula applies – just use the bag’s footprint and height.

For freight costing, you also need to know the pallet’s volume (length × width × height) and weight, because carriers charge by either weight or cubic volume, whichever is greater. This calculator gives you the count, but you must multiply by the unit weight to get total weight.

Frequently Asked Questions

What is the standard pallet size in New Zealand? There is no single standard. The Australian Standard 1165 × 1165 mm is common for domestic and trans-Tasman freight, but 1200 × 1000 mm is widely used for exports. Always confirm with your freight forwarder.

How do I account for pallet height in the stack height? If your height limit is measured from the floor, subtract the pallet height (typically 150 mm) before dividing by the carton height. If the limit is the racking beam height, you may not need to subtract the pallet if the beam is above the pallet.

Can I fit more cartons by rotating them? Sometimes yes, but not always. Rotating changes the number along each side. For a 1200 × 1000 pallet and a 400 × 300 carton, the non-rotated arrangement gives 9 per layer, while the rotated gives 8. Test both orientations manually.

What is the maximum weight a pallet can hold? It depends on the pallet construction. A standard wooden pallet is often rated for 1000–1500 kg, but you must check the specific pallet’s rating. The calculator does not include weight – multiply the number of units by the unit weight to get total load.

Does the calculator account for overhang or gaps? No. It assumes a perfect grid with no gaps. In practice, you may need to leave a small gap for handling, or you may have overhang which is usually limited to 25 mm per side. Adjust your carton dimensions slightly up to be safe.

What if my carton dimensions are in centimetres? Convert to millimetres first. 1 cm = 10 mm. For example, a 40 cm × 30 cm carton is 400 mm × 300 mm. Entering mixed units will give a wrong count.

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in pl | Pallet length | mm | 1200 | 0 | 3000
in pw | Pallet width | mm | 1000 | 0 | 3000
in cl | Carton length | mm | 400 | 0 | 2000
in cw | Carton width | mm | 300 | 0 | 2000
in ch | Carton height | mm | 250 | 0 | 2000
in mh | Max stack height | mm | 1500 | 0 | 5000
out per_layer | Units per layer | units | floor(pl / cl) * floor(pw / cw) | 0
out layers | Layers | layers | floor(mh / ch) | 0
out total | Units per pallet | units | floor(pl / cl) * floor(pw / cw) * floor(mh / ch) | 0