How Many Pallets Fit in a 20ft Container?

Single-tier floor counts for the four common pallet formats, with the 40 ft column for scale (full 40 ft breakdown: pallets in a 40 ft container):

Every count is our pallet calculator’s pattern search, which tries bands and staggered lanes and keeps the higher count, on the inside the published sheets print, with every pallet tight and none overhanging. The reefer column is lower because insulation shrinks the box: a 20 ft reefer’s interior is 5.454 × 2.290 m against the dry unit’s 5.898 × 2.352 m. Pallet footprints and load ratings for each format are in the pallet sizes guide.

EUR pallets load as two longitudinal bands. Band one: 4 pallets straight, 1.2 m side along the length — 4 × 1.2 = 4.8 m inside the 5.898 m interior. Band two: 7 pallets turned, 0.8 m side along the length — 7 × 0.8 = 5.6 m. Across the width the two bands take 1.2 + 0.8 = 2.0 m against 2.352 m available. Total 4 + 7 = 11, with 352 mm of width and ~0.3 m of length to spare — enough for dunnage, not for a twelfth pallet.

GMA pallets go in as two staggered lanes of five. In each lane four pallets load straight, 1.219 m along the length, and one is turned, 1.016 m along the length: 4 × 1.219 + 1.016 = 5.892 m, which leaves 6 mm of the 5.898 m interior. Two turned pallets cannot stand side by side — 2 × 1.219 = 2.438 m against 2.352 m of width — so one lane turns its pallet at the door and the other at the front wall, and each turned pallet stands beside a straight one: 1.219 + 1.016 = 2.235 m. That is 10 in total, with no overhang. UK 1200 × 1000 pallets reach 10 the same way: four straight and one turned in each lane (4 × 1.2 + 1.0 = 5.8 m), the turned ones at opposite ends, since a turned 1.2 m pallet beside a straight 1.0 m one takes 2.2 m of the width. Feed any custom size to the pallet calculator; it searches the same patterns.

Count in bands, each lane one orientation from end to end or a whole row turned at the door, and US pallets stop at 9 on the 5.898 m floor of a 20 ft, the count a table that works in bands prints. Reaching 10 pallets, the count Seaco’s lessor sheet prints, takes the staggered lanes above, each lane turning its pallets at the opposite end from the other, with 6 mm of the length to spare.

Both counts are right; they answer different questions. 10 pallets are the geometric maximum, for square, tight loads set down with care. Book on 9 when cargo overhangs the deck, when the pallets are not all square, or when they go in by forklift, which needs some play to set the last one down.

The 20 ft payload is 28,250 kg (62,281 lb), per 15 of 16 sheets. Eleven EUR pallets at 1,000 kg each: 11 t — no issue. At 2,000 kg: 22 t — fine for the container, already over what a US line allows on the road. At 2,500 kg: 27.5 t — inside the container rating with 750 kg to spare, but more than a US road load or a 40 t EU vehicle leaves for cargo. In the US the law is the 80,000 lb vehicle (per 23 CFR 658.17), and what it leaves for cargo on a usual tractor and chassis is what the lines print: 38,000 lb (17,236 kg) for a 20 ft on Atlantic Container Line’s sheet, 39,200 lb on Maersk’s and 37,500 lb on Westwood’s. In the EU a five-axle articulated vehicle may weigh 40,000 kg, and 44,000 kg when it carries a container in combined transport (per Directive (EU) 2015/719 and Directive 96/53/EC); less a tractor and chassis of about 12.2 t (Volvo’s FH tractor in running order — with fuel and driver, as the EU defines it — and Schmitz Cargobull’s S.CF container chassis, from their sheets) and the box itself, that leaves about 25,600 kg of cargo in a 20 ft, or 29,600 kg in combined transport.

So for dense palletised cargo — beverages, tiles, paper, metal parts — the working limit is the truck, not the box. This is precisely where the 20 ft earns its keep: it fills to its weight ceiling in 11 pallet spots, where the same tonnage in a 40 ft would ship half-empty air. Density arithmetic for the decision is in the 20 vs 40 ft guide.

Internal height is 2.393 m (7′10″). Two tiers fit when each loaded pallet — goods plus the 144 mm EUR pallet (per EPAL data sheet 05/2025) — stands no taller than 1.140 m (3′9″) for a pair stacked before loading, half the 2.280 m door, or 1.196 m (3′11″) when the top pallet is lifted on inside the box, half the 2.393 m inside height. A pair strapped together on the dock and driven in has to pass the door, so the door is the limit that usually binds. Clear it, and the count doubles to 22 EUR pallets. In practice three conditions must all hold: height (≤ 1.140 m per tier stacked outside, ≤ 1.196 m stacked inside), crush strength (the bottom tier’s packaging must bear the full top-tier weight through an ocean voyage’s vibration, not just in the warehouse), and weight (22 pallets × anything over ~1.28 t exceeds the 28,250 kg payload).

When cargo is stackable but fragile, the compromise is a partial second tier over the strongest pallets, or slip-sheets and load spreaders between tiers. When it is not stackable at all, you are volume-limited at 11 spots — and should price a 40 ft before booking two twenties.

Sequence matters in a box with 0.352 m of spare width. Load the heavy band first, pushed tight against the closed end and one wall; run the second band beside it; keep pallet-to-pallet gaps at zero (gaps let the load accelerate before it hits something). Aim for an even weight spread along the 5.898 m floor, which a container load calculator checks against the CTU Code’s centre-of-gravity limit — a 20 ft tolerates concentration better than a 40 ft, but a full load biased into one half of the box can still overload a truck axle at destination before anything breaks at sea.

Close out with the void filled: dunnage bags in the 352 mm wall strip, and either an airbag, lashing to the door-end rings, or a timber brace across the final row. The last pallet must not be able to lean on the doors — customs and terminal staff open them, and a leaning load is both a safety incident and the classic cause of rejected deliveries.

Any solid-wood pallet crossing an international border must be treated and marked under ISPM 15 — heat treatment to 56 °C core temperature for 30 minutes (HT stamp; per ISPM 15) or, less commonly now, methyl bromide fumigation (MB). The wheat-ear IPPC logo with country code and treatment mark must be visible on the pallet block. No stamp means the pallet — and often the whole consignment — can be refused, fumigated or destroyed at the destination port at your expense.

EPAL EUR pallets are heat-treated by default; cheap one-way pallets often are not. Plastic and presswood pallets are exempt. Check the stamp before stuffing, not after the container is sealed.

The 20 ft is the right container when weight fills it: cargo denser than about 850 kg/m³ — the 20 ft’s payload over its 33.2 m³ — reaches the payload ceiling in a 20 ft before a 40 ft would be half full, and you pay the smaller box’s rate. It is the wrong container for light, voluminous pallet freight: the 40 ft carries 25 EUR spots against 11, so it costs less per pallet whenever its freight rate is under 2.2 times the 20 ft’s. Put your two quotes against that ratio.

Rule of thumb: palletised cargo that needs no more than 11 pallet spots, or so dense that weight binds before floor space → 20 ft. Light cargo, 12–25 pallet spots → 40 ft, even sailing with empty floor. When the whole shipment is only a few cubic metres, get an LCL (shared container) quote too: LCL is charged by the cubic metre, so below some volume it beats any dedicated box, and where that point lies depends on the rates you are quoted.