Container Dimensions: A Visual Guide to 20′, 40′ and High Cube

Almost every cost decision in an import comes down to a simple question: will it fit? And right after that, a less simple one: will it fit and still be allowed on the road? This guide brings together the dimensions of the containers used in most operations, the weight limits that apply in Brazil and the calculations that prevent surprises when the order is closed.

Keep one idea in mind before the numbers: a container has two independent limits, volume and weight, and cargo hits one of them long before it hits the other. Knowing which one your cargo hits is what tells you whether to buy more units, change the packaging or switch to a different type of equipment.

The three sizes that cover most imports

The figures below are those published by Hapag-Lloyd for its standard equipment. The carrier’s own caveat applies: containers vary by manufacturer and owner, so for cargo close to the limit, confirm the specification of the actual unit you will use.

Notice what changes from the 40′ Dry to the 40′ High Cube: the floor is identical, the allowed weight is practically the same, and yet the HC carries 8.6 m³ more. The whole difference is thirty centimeters (about one foot) of height.

The thirty centimeters that change the math

The High Cube was created for cargo that takes up space without weighing much. If your product is bulky and light, such as plastic packaging, furniture, assembled components or foam, the HC gives you more cubic meters for the same container freight and practically the same available weight.

The floor and the pallets

The floor calculation is direct: internal length divided by one side of the pallet, and internal width divided by the other. The Brazilian standard pallet, the PBR, measuring 1.20 × 1.00 m (the same footprint as the ISO 1200 × 1000 pallet), works out like this:

Two readings matter more than the drawing. In the 40′, ten rows of two pallets take up 12.00 m of the 12.032 m available: a perfect fit, 20 positions, three centimeters to spare. In the 20′, four rows of two use 4.80 m and leave a 1.10 m gap that only takes one more pallet turned sideways, for 9 positions in total.

Market tables often quote 10 to 11 positions in a 20′ and 20 to 22 in a 40′. The difference appears when the operator turns some of the pallets and works with minimal clearance. Before agreeing on quantities with the supplier, confirm the layout with whoever will stuff the container: one pallet more or less changes the whole order.

Weight or volume: which runs out first

Divide the allowed weight by the available volume and you get the density the equipment can handle. In the 40′ High Cube, 28,600 kg in 76.3 m³ works out to about 375 kg per cubic meter. In the 20′, 28,130 kg in 33.2 m³ comes to about 847 kg per cubic meter.

That gives a useful rule of thumb: dense cargo, such as metal parts, ceramics or liquids in drums, tends to hit the weight limit in a 20′ with the container still half empty. Light, bulky cargo fills the volume of a 40′ HC with ten tons of capacity left over. Buying the wrong equipment means paying freight for air, or for space you cannot use.

The limit the road imposes in Brazil

This is the point that causes the most friction after customs release. The container accepts almost 28.6 tons of cargo, but what can travel by road to your warehouse is decided by Brazilian traffic law, not by the ocean carrier.

CONTRAN Resolution No. 882 of 2021 (in Portuguese) sets limits for gross vehicle weight and gross combination weight according to the number and spacing of axles, with a 5% tolerance on the total at weigh stations. In practice, for the most common truck combination the combined ceiling is around 48 tons, and from that figure you still have to subtract the tare of the tractor and trailer and the tare of the container itself.

• Typical payload left for a 40′ on a standard combination: somewhere between 25 and 27 tons, not the 28.6 the equipment allows.
• Above that, the options are splitting into two shipments, using a combination with more axles or transloading at the port, each with its own cost.
• Confirm before you buy, with the trucking company and for the specific route: state, road restrictions and weigh stations change the math.

VGM: the weight you declare before loading

Since July 1, 2016, under an amendment to the SOLAS convention, no container can be loaded on a ship unless its verified gross mass has been determined and reported. In Brazil, the procedure is governed by Ordinance No. 164 of 2016 of the Navy’s Directorate of Ports and Coasts, and the declaration is the responsibility of the shipper named on the bill of lading.

Two methods are accepted: weighing the packed and sealed container on a calibrated scale, or adding the weight of every item, packaging and pallet to the container’s tare. The second method does not apply to bulk cargo. A mismatch between the declared VGM and the real weight is grounds for refusing the container, and the cost of cargo left behind always falls on the importer.

When a dry container will not do

Three situations take cargo out of the standard container.

Temperature control. The 40′ Reefer High Cube measures 11.599 × 2.290 × 2.425 m inside, with a tare of 4,420 kg, payload up to 29,580 kg and 67.7 m³. Note that the refrigeration unit eats into length and width: almost half a meter less length and six centimeters less width than a standard 40′.

Cargo too tall to go through the door. This is where the open top comes in, loaded from above by crane. The limit is no longer the door but the clearance along the route.

Cargo too wide or irregular. This is the case for the flat rack, a platform with end walls, used for machinery, steel coils, structural steel and non-standard vehicles. Dimensions vary considerably by equipment owner, so ask for the unit’s specification before planning.

The NOR: a reefer that travels switched off

There is a fourth type of equipment that almost never appears in the tables and is worth knowing, because it holds the most direct freight saving on an import from Asia. The NOR, short for Non-Operating Reefer, is a refrigerated container shipped with its unit switched off, carrying ordinary dry cargo.

It exists because of an equipment imbalance. Brazil exports meat, fruit and other cargo that needs refrigeration, much of it to Asia, and receives manufactured goods in return, which travel in dry containers. The result is a surplus of empty reefers at Brazilian terminals and a shortage on the other side. Instead of paying to reposition the empty equipment, the carrier prefers to sell it as dry cargo space, at a lower rate.

The volume difference is the same one that separates the 40′ Dry from the High Cube, only now it works against you: the same 8.6 m³ less. Notice also how the weight flips. On paper the NOR accepts almost a thousand kilos more than the High Cube, because refrigerated equipment is built for a higher gross weight. But its tare is 520 kg heavier, and what uses up the Brazilian road limit is the tare, not the equipment’s gross rating. In practice, on the truck, you end up with less payload, not more.

How much you save depends on the route and the season. Brazilian operators report NOR freight up to 40% below dry rates at the peaks of the imbalance. And since freight is part of the tax base for Brazilian import taxes, lower freight also lowers the tax, not just the transport cost.

Where the NOR bites

• The floor is different. The grooved aluminum is there so cold air can circulate under the cargo. It makes it harder to lash machinery and vehicles, and calls for care when moving pallets with a forklift.
• The walls are insulated, not corrugated steel. They are polyurethane clad in aluminum or stainless steel. They dent more easily during stuffing and repairs cost much more than on a dry container.
• Moisture. The box is sealed and insulated. Cargo loaded with moisture tends to cause condensation during the voyage, and the damage only shows up at destination.
• Free time and demurrage. Free time is usually shorter and the daily demurrage rate higher, because the equipment is worth more. This is where the freight saving disappears when clearance is delayed.
• Restrictions and return. Cargo that leaves residue is usually refused, dangerous goods are rarely accepted, and the container generally has to be returned clean.
• Availability. It is not a regular offer. It depends on the origin, the season and the carrier’s equipment stock that week.

So the math is not just freight. It is freight minus the demurrage risk and minus the cost of stuffing a box that needs more care. For dry, palletized cargo of medium volume it usually works out well. For heavy machinery, bulk cargo that leaves residue and operations that will need a lot of time at the port, it rarely pays off.

How Silcor Trading helps

Silcor Trading treats the choice of equipment as part of the quote, not as a consequence of it. Before the volume is agreed with the supplier, the operation is simulated with the real packaging dimensions: how many cartons per pallet, how many pallets per container, the resulting weight and whether that weight can travel to the destination without transloading.

That changes concrete decisions. An order that would take two 20′ containers sometimes fits in one 40′ High Cube with lower freight. Dense cargo that would fill half a 40′ ships more cheaply in a 20′. A part that does not fit through the door has to be identified in the product engineering, not at the port.

Because we run the operation end to end, including stuffing at origin by our own teams in China and the United States, the floor layout, the VGM and the road limits at the final destination are discussed before shipment. That is what prevents the expensive discovery that the cargo fit on the ship but not on the truck.

Conclusion

A container is a box with two ceilings, volume and weight, and a third ceiling that is not written on it: the Brazilian road. Calculating all three before buying saves freight, avoids transloading and keeps you from discovering the limit at the weigh station.

Want to check whether your order works best in a 20′, a 40′ or a High Cube? Talk to Silcor Trading and we will simulate the container layout with your real packaging dimensions before you agree the volume with your supplier.