How Many Boxes Fit on a Pallet? Layer Patterns, Height Limits, Overhang

How many boxes fit on a pallet? The answer is a computation, not a lookup: cartons per layer × number of layers, subject to a height limit, a weight limit, and an overhang rule. This guide walks the method; the pallet calculator runs it instantly with a top-view diagram.

Step 1 — Cartons per Layer

For a GMA pallet (1219 × 1016 mm) and a carton of L × W footprint, the simplest arrangement is a grid: floor(1219 ÷ L) × floor(1016 ÷ W) — but you must also test the rotated grid and mixed patterns that combine both orientations in one layer. For a EUR pallet, substitute the 1200 × 800 mm deck from the EPAL specification. Orientation alone often swings the count by a full row:

Picking the wrong grid here costs 25% of every layer — free capacity lost on every pallet you ever ship. Mixed patterns earn their keep when the carton is large relative to the pallet, leaving a wide strip that a rotated row can reclaim. A 600 × 400 mm carton on GMA is the classic case:

Step 2 — Layers

layers = floor((max height − pallet height) ÷ carton height). Height limits come from three places; use the lowest:

• Warehouse racking at destination: commonly 60–64 in total including the pallet in US distribution centers — always confirm.
• Container clearance: a 40HC gives 269.5 cm internal height; two stacked pallet loads must each stay under ~132 cm including the pallet.
• Product strength: bottom cartons bear the whole column. Check the carton's stacking strength (BCT/ECT) against the weight above it, derated for humidity and transit time — a carton that holds in the lab crushes after three humid weeks at sea. ISTA transit-testing protocols exist precisely because lab strength and voyage strength differ.

Step 3 — Weight Check

max layers by weight = floor(pallet load rating ÷ (cartons per layer × carton weight)). Use the dynamic or racked rating, not static (see pallet standards).

How Many Boxes Fit on a Pallet: Full Worked Example

Carton 300 × 250 × 200 mm, 12 kg. GMA pallet, 145 mm tall, max stack height 1,500 mm, dynamic rating 1,150 kg:

• Per layer (Grid A): 16
• Layers by height: floor((1500 − 145) ÷ 200) = 6
• Layers by weight: floor(1150 ÷ (16 × 12)) = 5
• Result: 5 × 16 = 80 cartons, 960 kg, 1,145 mm tall — weight-bound, with 355 mm of unused height headroom.

Open this exact example in the pallet calculator to see the layer diagram and the pallet count for a full order. Weight-bound pallets are a signal worth acting on: a stronger pallet or lighter cartons converts that headroom into cargo.

Scenario: FBA Prep with a Height Cap

Amazon-bound freight adds a hard external constraint: US fulfillment centers expect GMA pallets with total height commonly capped around 72 in (~180 cm) including the pallet — confirm the current routing guide, since programs and countries differ. Take a 300 × 250 × 200 mm carton at 10 kg, 500 units: run it with a 180 cm cap and you get 16 per layer × 6 layers = 96 cartons per pallet at about 135 cm — the 1,000 kg weight limit binds before the height cap does. That means 6 pallets for the order, with the last one only partially built. Practical FBA notes: a short final pallet still occupies a full pallet position on the truck, and an over-height pallet gets refused or re-worked at the FC dock at your expense. Building to the cap minus a safety margin (wrap adds 1–2 cm; labels must stay visible) is the habit that avoids re-work.

Column Stack vs Interlocked

• Column stacking (corner-over-corner) preserves up to 100% of carton compression strength — corners are where boxes are strong. Best when cartons are the fragile element.
• Interlocked/brick patterns sacrifice ~40–50% of compression strength but tie the load together against shear and lean. Best for heavy, robust cartons on rough transit legs.
• A common compromise: column-stack all layers, interlock only the top layer, and rely on stretch wrap and corner boards for stability.

Overhang: Just Don't

Cartons extending past the pallet edge lose up to a third of their stacking strength, get crushed by adjacent pallets, and are the first thing a carrier photographs when denying a damage claim. If your carton doesn't tile the pallet without overhang, change the pattern or the carton — the pallet calculator lets you set an overhang allowance of zero and see what actually fits. Underhang costs a little density (see freight density) but is structurally safe.

The cost side is easy to underestimate: overhang also inflates the measured footprint of the load, and LTL carriers rate on measured dimensions, not on the pallet size you intended. A couple of centimeters of carton past each edge can push the billed dimensions to the next threshold — you pay more to ship a weaker load.

Common Mistakes and Edge Cases

• Measuring the product instead of the carton. Ti-hi math uses outer carton dimensions — corrugate thickness, flap bulge, and any bagging included. A 5 mm error per carton compounds across four cartons in a row.
• Forgetting the pallet and wrap in declared dimensions. Carriers measure the whole unit load. The ~145 mm pallet plus wrap can move you into a worse density band or a higher volumetric charge — details in chargeable weight explained.
• Tall, narrow stacks. A load much taller than its footprint is wide becomes tip-prone on a forklift; if the stack height exceeds roughly twice the shorter base dimension, add strapping or reconsider the layer count.
• Mixed-SKU "rainbow" pallets. Different carton footprints in one layer break the tiling and the column alignment — expect fewer cartons per pallet and more damage than the single-SKU math predicts.
• Optimizing the pallet but not the container. The tallest legal pallet isn't always right: two shorter loads that double-stack in a container often beat one tall load that strands a meter of height. Check how many pallets fit in a container before locking the ti-hi.