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

The quick answer: a 40’ container takes 24–25 euro pallets or 20 standard 48 × 40 in pallets on the floor, and a 20’ takes 11 or 10. Those counts are not fixed properties of the box, though. They depend on the loading pattern, and the wrong pattern can cost you up to five pallets in a 40’.

This is how I work out pallet counts before I ask for a quote or make a booking. The table below is single stacked, on the floor.

For pallets stacked two high, double these numbers, but only when the load height, the strength of the bottom boxes and the payload all allow it. More on that below.

Why pallets never fit a container wall to wall#

Start with the width. A standard 20’ or 40’ dry container measures 2,350–2,352 mm across the inside, and none of the common pallet sizes divides into that cleanly. Two 48 × 40 in pallets side by side take 2,032 mm. A euro pallet turned one way next to one turned the other way takes 1,200 + 800 = 2,000 mm. Two UK pallets or two square 1,100 mm pallets take 2,200 mm. Whatever pattern you pick, you end up with a gap along the width, the length, or both.

Pallet sizes settled around trucks and warehouse racking first, and containers came from a different set of constraints, so the two were never designed to fit each other.

The numbers in this guide use a 40’ dry container at 12,032 × 2,352 mm inside and a 20’ at 5,900 × 2,352 mm. These are ISO 668 series containers, but ISO 668 only sets minimum internal dimensions. The exact inside measurements come from carrier spec sheets and vary slightly by manufacturer. Carrier figures of 2,350 mm wide, or 5,898 mm long for a 20’, give the same pallet counts. Door openings and heights for each size are in the container dimensions guide.

How 25 euro pallets fit in a 40’: the 15 + 10 pattern#

The euro pallet is 1,200 × 800 mm under the EPAL standard. The trick to getting 25 in a 40’ is loading the two rows differently:

• Row one: pallets with the 800 mm side along the container length. 12,032 ÷ 800 gives 15 pallets.
• Row two: pallets with the 1,200 mm side along the length. 12,032 ÷ 1,200 gives 10 pallets.

That is 15 + 10 = 25. The two rows use 1,200 + 800 = 2,000 mm of width, which leaves about 350 mm (2,352 − 2,000 = 352 mm) along one wall. Both rows come to exactly 12,000 mm, so there is 32 mm to spare at the doors.

If every pallet faces the same way, you lose up to five. With the 1,200 mm side along the length you fit two across and ten deep, so 20. With the 800 mm side along the length only one fits across, so 15. Either way, a single orientation tops out at 20 in a 40’.

So where does 24 come from? It is the same mixed pattern with one pallet left out of the long row (14 + 10). 32 mm of clearance is tight for a forklift, and dropping one pallet gives the loader room to work. When a quote says 24, that is usually the reason.

A 20’ works the same way: 5,900 ÷ 800 gives 7 and 5,900 ÷ 1,200 gives 4, so 11 euro pallets. One orientation only would give 8.

The 350 mm strip along the wall is narrower than the short side of a euro pallet (800 mm), so no pallet goes there in any direction. The only way to use it is to load loose boxes straight onto the floor alongside the pallets.

Standard 48 × 40 in pallets: why 20 is the number#

The US standard pallet is 48 × 40 in (1,219.2 × 1,016 mm), also called the GMA pallet. Two side by side take 2,032 mm, leaving 320 mm of width. Rows of two, each 1,219 mm deep, fit 9 times into 12,032 mm, so 18 pallets. The 1,059 mm left at the end takes one more pallet turned 90°, for 19.

To reach 20, use a pinwheel pattern: four pallets turned around each other to make a square block of 2,235 × 2,235 mm (1,219.2 + 1,016). Mixing these blocks with straight rows gets you 20 in a 40’, the most any of these layouts reaches. In a 20’, two blocks (4,470 mm) plus one straight row (1,219 mm) take 5,690 mm of the 5,900 mm length, which gives 10.

UK pallets (1,200 × 1,000 mm, an ISO standard size) follow the same logic as euro pallets. In a 40’, one row with the 1,200 mm side across the container takes 12 pallets and the other row with the 1,000 mm side across takes 10, so 22 in 2,200 mm of width and 32 mm spare at the doors. Many plans use 21 for working room; a single orientation gives 20. In a 20’ the mixed rows give 5 + 4 = 9, and two rotated blocks of 2,200 × 2,200 mm plus one straight row (5,600 mm in total) give 10.

Across pallet sizes and patterns, a strip of roughly 300–500 mm usually ends up empty somewhere. That lost space is a big part of why floor loaded cargo (boxes stacked directly on the container floor, no pallets) fits more into a container than palletized cargo. The CBM per container guide compares the two in cubic meters.

Before you double stack: four checks#

Stacking pallets two high doubles the count on paper. In practice, check these four things first.

1. Can the bottom boxes carry the load? The boxes on the lower pallet take the full weight of the pallet above. Work out the compression strength before you commit; the boxes per pallet guide covers how to calculate it.
2. Is the top of the lower pallet flat? If the top layer is uneven, the pallet above rests on a few boxes and all its weight goes into them.
3. Does the weight still work? 25 euro pallets stacked two high at 600 kg each is 50 × 600 = 30,000 kg. A 40’ dry container has a payload of about 28,800 kg (28,750 kg on one carrier’s spec sheet, 28,800 kg in our calculator), so you reach the weight limit before the space is full. Payload varies by carrier and equipment, and one carrier rates its 40’ dry at 26,840 kg, so check the actual box. Limits and Verified Gross Mass (VGM) rules are in the container weight limits guide.
4. Is the load spread? A slip sheet or a single sheet of plywood between the tiers spreads point loads across the boxes below. It costs very little.

Height is the other limit. A 40’ high cube is about 2,695–2,700 mm high inside, but the door opening is only 2,585–2,597 mm high. The two tiers have to go through the door, so the door height, not the inside height, sets the maximum combined height. On a standard 40’ dry container the door opening is 2,280–2,292 mm high.

When the bottom tier fails, it rarely stops at one pallet. Crushing can spread across the whole lower tier of the container, and because it happens slowly over the ocean leg, nobody sees it until unloading at destination. My rule: if the bottom boxes can’t carry the top tier with room to spare, book another container or floor load the cargo instead.

When weight stops you before space does#

Take a hypothetical case. An exporter plans 25 euro pallets in a 40’, each with 1,100 kg of product. The pallet itself adds about 25 kg, so each unit weighs 1,125 kg, and 25 × 1,125 = 28,125 kg, about 28.1 t. That is under the roughly 28.8 t payload of a 40’ dry container, so the container rating is fine.

The road leg is a different question. The destination country limits the gross vehicle weight (the maximum permitted weight of the loaded vehicle), and after the truck, chassis and container are counted, the cargo that can actually travel by road may be well below the container payload. On US Interstates the limit is 80,000 lb gross vehicle weight. For international transport in the EU, a 5- or 6-axle combination is limited to 40 t, and 44 t applies to a 3-axle tractor with a 2- or 3-axle semi-trailer carrying a container in combined transport. How much cargo that leaves depends on the vehicle, so check it with your trucking company or haulier.

That is why I keep pallet count and weight apart in a quote: something like “25 positions, weight to be confirmed per order.” Check the load with your real box dimensions and quantities in the container loading calculator. The link opens with 500 boxes of 60 × 40 × 40 cm at 8 kg each in a 40’ high cube: all 500 fit, so quantity is the limit, with about 62.9% space utilization and 4,000 kg in total. Confirm the VGM for each order before the container is loaded onto the ship.

High cube, reefer, square and oversized pallets#

40’ high cube. The floor is the same length and width as a standard 40’, so the single stacked pallet count does not change. The extra 305 mm (about 30 cm) of internal height only helps with tall loads or stacking two high.

Reefers. Insulation makes a refrigerated container smaller inside. A 20’ reefer is about 5,425–5,456 × 2,280–2,288 mm inside, against 5,900 × 2,352 mm for a 20’ dry. Using about 5,450 mm of length, euro pallets drop from 11 to 10 (6 + 4). A 40’ high cube reefer, at 11,590–11,599 × 2,284–2,290 mm, takes 23 euro pallets (14 + 9) instead of 25.

Square 1,100 × 1,100 mm pallets. This size (T11) is common in Asia. Two across take 2,200 of the 2,352 mm width, so a 40’ fits 10 rows (12,032 ÷ 1,100), or 20 pallets, and a 20’ fits 5 rows (5,900 ÷ 1,100), or 10 pallets. The pallet is square, so turning it gains nothing.

Oversized and non-standard pallets. Anything wider than about 1,175 mm (half of 2,350–2,352 mm) can’t sit two across, which halves the number of pallets per row. A few tens of millimeters can change how the rows work, so measure the actual pallets before you plan the load.

Five mistakes that cost money#

1. Assuming a high cube has more floor. It has the same floor as a standard 40’. Quote more pallets for a 40’ high cube and you find out after booking, when the overflow needs a second container.
2. Leaving out the pallet weight. 25 wooden euro pallets weigh about 625 kg on their own. A typical 48 × 40 in pallet weighs about 17 kg (37 lb), so 20 of them add about 340 kg. If the packing list shows only product weight, the VGM comes out too low. The VGM is a condition for loading the container onto the ship: if it is missing or wrong, the container is held at the terminal and doesn’t get loaded, which can mean it is rolled to the next sailing. Depending on the carrier and the country, there may be penalties as well.
3. Not planning the loading order. The 15 + 10 pattern only works if both rows are loaded the way they were planned. If the loading crew (the forklift operators) places pallets as they come, you can end up with 22 or 23. Send the crew a load plan showing the floor layout, not just a number.
4. Forgetting the door. The door opening is narrower and lower than the inside of the container. A load that clears the ceiling can still catch on the top of the door frame. Door dimensions for each size are in the container dimensions guide.
5. Mixing pallet sizes. Put euro pallets and 48 × 40 in pallets in the same container and neither pattern works. You usually end up with more empty floor than with one size alone.

Palletize or floor load?#

Sometimes the better question is whether to use pallets at all. Floor loaded cargo fits the most into a container. Pallets take up space themselves and never match the floor grid exactly, so palletized cargo fits less.

The 10–20 point gap is a common rule of thumb, not a measured figure, so treat it as a rough guide. In practice, I palletize high-value cargo and anything going into a distribution center, and floor load low-value, bulky cargo going to a warehouse that unloads by hand. Over a year of regular shipments, the difference can add up to a whole container.

For the final call, compare both options SKU by SKU in the container loading calculator. To see how far floor loading goes, load the same 60 × 40 × 40 cm boxes to the maximum: a 40’ high cube takes 650 of them, with space as the limit, at about 81.7% utilization and 5,200 kg.

One note on the calculator’s pallet mode. It uses a heuristic engine that usually places pallets in a single orientation, so it can show fewer pallets than the patterns in this guide, for example 20–21 euro pallets or 19 standard 48 × 40 in pallets in a 40’, and 9 euro pallets in a 20’. Use the pattern counts here for planning and the calculator to check your real boxes and weights.

If your cargo won’t fill a container either way, the FCL vs. LCL guide explains when a shared container makes more sense.