How Many Pallets Fit in a 20ft and 40ft Container?

How many pallets fit in a 20ft or 40ft container? The standard answers, single-stacked on the floor:

Double-stacking, where cargo height and strength allow, doubles these. The rest of this guide shows where the numbers come from — because the counts depend on loading patterns worth understanding before you promise a customer "25 pallets."

The Geometry Problem

ISO containers are ~2,352 mm wide internally; usable lengths are ~5,898 mm (20ft) and ~12,035 mm (40ft) (the ISO 668 series, published by ISO; exact figures vary slightly by manufacturer — see container dimensions). No major pallet standard divides evenly into 2,352 mm — pallets were standardized around trucks and warehouses decades before anyone optimized them for ISO boxes.

How Many EUR Pallets Fit in a 40ft Container: The 15 + 10 Pattern

EUR pallets (1200 × 800, per the EPAL specification): the trick is mixing orientations. The standard 40ft pattern: one column loaded 800-deep (15 per 12 m) alongside one column loaded 1,200-deep (10 per 12 m) = 25 pallets. In a 20ft: 7 + 4 = 11. Some loaders prefer a uniform 24 in the 40ft for faster, squarer loading. The floor plan, to scale:

Note what the diagram makes obvious: both rows finish within 35 mm of the door, but a ~350 mm strip of width rides empty for the whole voyage. That strip is too narrow for any EUR pallet orientation — it can only be recovered by floor-loading cartons instead.

GMA Pallets: Two Across Plus a Pinwheel

GMA pallets (1219 × 1016): two across in the width (2 × 1,016 = 2,032 mm) with 1,219 mm depth per row → 9 rows in a 40ft = 18, plus 2–3 more by turning the last pallets 90° ("pinwheeling") = 20–21. In a 20ft: 10.

Every count above leaves 300–500 mm of width or length unused somewhere — that's the pallet-vs-container mismatch, and it's why floor-loading cartons beats palletizing by 10–20 percentage points of volume utilization (see how many CBM fit in a container).

Double-Stacking Checklist

1. Bottom load strength — cartons must carry the full upper pallet (see stacking strength in boxes per pallet).
2. Flat top surface — uneven top layers concentrate the upper pallet's weight on a few cartons.
3. Payload — 2 × 25 EUR pallets at 600 kg each is 30 t; a 40DC's payload is ~28,800 kg. Weight binds before space. Check container weight limits.
4. Load spread — slip sheets or plywood between tiers spread point loads and are cheap insurance.

The failure mode is expensive enough to respect: a crushed bottom tier isn't one damaged pallet, it can be the whole lower half of the container — and because the crush happens gradually at sea, it's usually discovered at devanning, weeks after anyone could have fixed it. If the bottom cartons can't demonstrably carry the upper tier with margin, ship more containers or floor-load; the freight saved by forcing a double stack rarely covers one crushed tier.

Scenario: Promising a Customer "25 Pallets"

An exporter quotes a German buyer 25 EUR pallets per 40ft. The geometry holds — but each pallet carries 1,100 kg of product plus ~25 kg of pallet, so the load totals about 28.1 t against a ~28.8 t payload. That clears the container spec with little margin, and it may not clear the road: many destination countries limit gross truck weight such that the practical container payload on the final road leg is lower than the container's own rating. The honest quote is "25 positions, weight-checked per order" — run the actual carton and count in the container loading calculator and verify the declared VGM before booking, not at the terminal gate.

Edge Cases: High Cubes, Reefers, and Odd Pallets

• 40HC adds height, not floor. The high cube's footprint is identical to the 40DC, so single-stack pallet counts don't change — the extra ~30 cm only pays off for taller unit loads or double-stacking.
• Reefers are smaller inside. Insulation cuts both width and length (a 20ft reefer is roughly 5,425 × 2,286 mm inside), which typically costs one or two pallet positions versus a dry box — never quote reefer counts from dry-container math.
• Square Asian pallets (1100 × 1100): two across the width fits (2,200 of 2,352 mm), giving around 20 in a 40ft and 10 in a 20ft — a clean pattern with no orientation tricks available.
• Oversize or custom pallets: anything wider than ~1,170 mm can no longer go two-across with a second full column. Measure before assuming; a 30 mm difference can halve a row.

Common Mistakes That Cost Money

• Counting the high cube as extra floor. Quoting "more pallets in a 40HC" is the classic error — the floor is the same, and the correction usually surfaces after the booking, as cargo rolled to a second container nobody priced.
• Forgetting pallet tare in the VGM. Twenty-five wooden pallets add roughly 600–700 kg that the packing list's product weight doesn't show. A misdeclared VGM can hold the container at the terminal, and repeated offenses attract carrier penalties.
• Planning the pattern without the loading sequence. The 15 + 10 EUR pattern assumes pallets go in two disciplined rows; a forklift crew improvising at the ramp often lands 22–23 where the plan said 25. Give the loader a floor diagram, not just a number.
• Ignoring the door. The door aperture is slightly narrower and shorter than the inside of the box. A tall double-stacked pair that clears the ceiling can still fail to clear the door header — check aperture heights in container dimensions before committing to a stack height.
• Mixing pallet footprints in one plan. Ten EUR plus ten GMA in the same 40ft does not load like either pure pattern; mixed footprints break the rows and typically strand more floor than either standard alone would.

Should You Palletize at All?

High-value or DC-bound cargo → palletize. Low-value, high-volume cargo to a devanning warehouse → floor-load. Run the actual comparison per SKU in the container loading calculator — try the max-fill view with your cartons loaded directly on the floor — cartons directly vs cartons-on-pallets is often a full container size worth of difference across a year of shipments. Whether that tips you toward a full container at all is the subject of FCL vs LCL.