How Many Pallets Fit in a 20 ft 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):

The reefer column is lower because insulation shrinks the box: a 20 ft reefer’s interior is 5.444 × 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: two columns with the 1.016 m side across the width (2 × 1.016 = 2.032 m, fits 2.352 m). Lengthwise, 1.219 m per pallet gives floor(5.898 / 1.219) = 4 per column — 8 pallets — plus two turned at the door end (1.016 m deep, 1.219 m across, 2 × 1.219 = 2.438 m just over width, so they load side-by-side turned 90°): 10 total. UK 1200 × 1000 pallets manage only 9 — the near-square footprint wastes the most floor. Feed any custom size to the pallet calculator; it searches the same band patterns.

The 20 ft payload is 28,250 kg. Eleven EUR pallets at 1,000 kg each: 11 t — no issue. At 2,000 kg: 22 t — fine for the container, already marginal for road legality in many countries. At 2,500 kg: 27.5 t — inside the container rating with 750 kg to spare, but over the road limit almost everywhere (a US road maximum is ~19.9 t of cargo in a 20 ft; the EU allows ~21 t on a standard artic).

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. Two tiers fit when each loaded pallet — goods plus the 144 mm EUR pallet deck — stands no taller than ~1.19 m. Clear that, and the count doubles to 22 EUR pallets. In practice three conditions must all hold: height (≤ ~1.19 m per tier), 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 0.35 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 5.9 m floor — a 20 ft tolerates concentration better than a 40 ft, but a full 21 t 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) 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 ~850 kg/m³ hits the payload ceiling in a 20 ft before a 40 ft is half full, and you pay the smaller box’s rate. It is the wrong container for light, voluminous pallet freight — the 40 ft rate is typically only 25–30% above the 20 ft rate but carries 25 EUR spots against 11, so its cost per pallet is roughly 45% lower.

Rule of thumb: palletised cargo over ~1 t per pallet or under ~12 pallet spots → 20 ft. Light cargo, 12–25 pallet spots → 40 ft, even sailing with empty floor. Between 11 and 15 m³ total, get an LCL (shared container) quote too — below ~15 m³ LCL often beats any dedicated box.