Container Dimensions • Sea Freight • 20ft • 40ft • High Cube
Container dimensions: all sizes clearly at a glance
Whether you are shipping a pallet of parts or a full load of consumer goods: the right container dimensions determine whether your transport is tightly organised or turns into hassle. On this page you will find all standard sizes clearly together — from 20ft to 45ft High Cube — so you know exactly which container type fits your goods, volume and load plan.
In short: what are the standard container dimensions?
Sea containers follow the worldwide ISO 668 standard and have a uniform width of 2,438 mm (8 ft). The most common types are the 20ft container (internally around 6.06 m long, 33.1 m³), the 40ft container (around 12.19 m, 67.7 m³) and the 40ft High Cube with 30 cm of extra height (76.4 m³). Internal dimensions are always smaller than external ones — and the door opening is slightly tighter still. Which type fits depends on volume, weight and load plan.
Container dimensions are a core topic within sea freight, alongside container handling in the port and the customs steps for import. The choice also carries through the whole chain: after arrival, the same container continues by rail, barge or road transport into the hinterland, often in an intermodal combination. And whoever knows the sizes also plans the customs handling and documents better.
Why the right container dimensions matter so much
The container size looks like a detail but directly determines costs and planning. With the right container dimensions you avoid costs, delay and loading problems: a container that is too small means a second booking or cargo left behind, a container that is too large means paying for air. And cargo that just doesn't fit through the door opening means repacking on the quay — exactly what you want to avoid.
The container's strength lies in standardisation. Because the sizes are standardised worldwide, ship, train, barge and truck exchange the same container seamlessly. The whole container world also counts in TEU — twenty-foot equivalent unit — literally based on the 20ft container: the port of Rotterdam handled around 14.2 million of them in 2025.
Whoever knows the sizes can therefore make a tight load plan in advance: how many pallets fit, how high can you stack, and is a standard container enough or do you need a High Cube, reefer, open top or flat rack?
What companies often get wrong about container dimensions
The first misconception: "a 40ft container carries twice as much as a 20ft." In volume that is roughly true (67.7 versus 33.1 m³), but not in weight: the maximum payload of both is almost the same. Heavy cargo such as metal, tiles or machinery often maxes out a 20ft container on weight while space remains — a 40ft then adds nothing. The 40ft and High Cube pay off precisely for voluminous, lighter cargo.
The second misconception: "the external size is the internal size." A 20ft container is over 6 metres on the outside, but internally around 6.06 by 2.35 metres remain — and the door opening is slightly smaller than the internal size. Whoever bases the load plan on external dimensions, or allows no margin for the forklift, gets stuck at loading. Always calculate with internal dimensions and the door opening.
The third misconception: "every container type is available everywhere at once." Standard 20ft and 40ft containers are plentiful, but special types such as reefers, open tops, flat racks and 45ft High Cubes are scarcer and not directly available on every route or terminal. With special cargo, it pays to fix the container type early — otherwise availability dictates the planning instead of the other way around.
Practical example
A Rotterdam trading company wants to ship 22 euro pallets of consumer goods to a customer and requests two 20ft containers. TOP runs the load plan: as a rule of thumb, around 25 euro pallets fit on the floor of one 40ft container, so a single container suffices — considerably cheaper than two separate 20ft bookings. Because the boxes are stacked up to 2.60 metres high, TOP also advises a 40ft High Cube: it offers 2,896 mm of internal height, where the standard 40ft with 2,591 mm would be just too tight. One container, one booking, no loading problems.
All container dimensions at a glance
Below are the internal dimensions (in mm) and the capacity of the most common container types. These are the sizes to base your load plan on.
Container dimensions in numbers: sources and methodology
The sizes above are internal dimensions; the standardisation behind them and the figures below come from ISO, evofenedex and the port of Rotterdam, and were verified for this page in August 2026.
ISO 668: the world standard — The dimensions of sea containers are laid down worldwide in the ISO 668:2020 standard (Series 1 freight containers). All standard containers have a uniform width of 2,438 mm (8 ft); the standard height is 2,591 mm (8 ft 6 in) and High Cube containers measure 2,896 mm (9 ft 6 in). Thanks to that standardisation, containers fit every ship, train and truck in the world.
14.2 million TEU in Rotterdam — The port of Rotterdam, Europe's largest container port, handled around 14.2 million TEU in 2025. The TEU (twenty-foot equivalent unit) is literally based on the 20ft container: the unit of this page is also the counting unit of the entire container trade.
One size, every mode — Precisely because container sizes are standardised, ship, train, barge and truck exchange the same container seamlessly. From Rotterdam, a container travels via over 400 international rail connections and a fine-meshed barge network into the European hinterland — without being unpacked once.
Source: Port of Rotterdam, containers
How TOP arranges the container choice in practice
TOP starts with your cargo: dimensions, weight, number of pallets and any specifics such as temperature requirements or oversize. On that basis, our forwarders advise the container type that fits — and run the load plan, so you don't pay for air and nothing has to stay behind on the quay.
TOP then arranges the rest of the chain around it: the booking with the carrier, the container handling in the port including monitoring demurrage and detention deadlines, the customs handling and the onward transport by rail, barge or truck. You follow the status of your container in real time via the TOP platform with API integrations.
Unsure about the right size or the optimal load combination? Request a quote, prepare your shipment via book a shipment, or schedule an introduction with TOP.
Which companies is TOP suitable for?
TOP is suitable for companies shipping by container that want to be sure size and load plan are right. These can be SMEs booking their first full container, but also multinationals with weekly container flows in which every sub-optimally filled container costs money structurally.
Boards want predictable transport costs per container. Logistics managers want a load plan that is correct and a container type that is available when needed. Procurement and warehouse teams want to know how many pallets really fit. TOP understands that these interests come together in one thing: the right container, well filled, at the right moment.
That is why TOP works in an advisory and practical way. No unnecessary jargon, but clear explanations of sizes, load plans and availability. For general developments in the transport sector, TOP also refers where relevant to industry information from Transport en Logistiek Nederland.
TOP is not a standard freight forwarder
TOP helps companies with a practical combination of customs matters, sea freight, air freight, intermodal transport, warehousing, rail and barge. This makes TOP particularly suitable for entrepreneurs and logistics teams who want understandable advice on importing, exporting and the right container choice without complicated jargon. Its strength lies in organising, explaining and following up on the entire logistics chain — down to the millimetre of the load plan.
Frequently asked questions about container dimensions
What are the dimensions of a 20ft container?
A standard 20ft container (20DV) has internal dimensions of around 6,058 mm long, 2,438 mm wide and 2,591 mm high, with a capacity of 33.1 m³. The external dimensions and the door opening differ slightly.
What are the dimensions of a 40ft container?
A standard 40ft container (40DV) has internal dimensions of around 12,192 mm long, 2,438 mm wide and 2,591 mm high, with a capacity of 67.7 m³. The 40ft High Cube is 30 cm taller (2,896 mm) and offers 76.4 m³.
What is the difference between a 40ft and a 40ft High Cube?
Length and width are the same; the difference is in the height. A High Cube is internally 2,896 mm high instead of 2,591 mm — 30 cm extra that, with high-stacked or voluminous cargo, often makes the difference between one and two containers.
How many euro pallets fit in a container?
As a rule of thumb, around 11 euro pallets fit on the floor of a 20ft container and around 25 in a 40ft container, unstacked. The actual number depends on pallet size, stacking and weight — TOP is happy to run the load plan for you.
What is a TEU?
TEU stands for twenty-foot equivalent unit: the counting unit of container shipping, based on the 20ft container. A 40ft container counts as 2 TEU. The port of Rotterdam handled around 14.2 million TEU in 2025.
Does TOP help choose the right container type?
Yes. Based on your cargo, TOP advises which container type fits — from standard dry van to High Cube, reefer, open top or flat rack — and runs the load plan, so size, weight and costs are right before you book.
Conclusion: the right size prevents costs and hassle
Container dimensions are standardised worldwide, but choosing the right type remains tailored work: volume, weight, stacking height and availability together determine what fits. Whoever calculates with internal dimensions and runs the load plan in advance avoids costs, delay and loading problems.
TOP actively thinks along about which container fits your shipment best. Convenient, fast and typically TOP: no hassle, just clarity.
Find the right container for your cargo
Unsure between a 20ft, 40ft or High Cube — or do you have special cargo? TOP runs the load plan and advises the type that fits.
Request a quoteWant to know more about Trans Ocean Pacific forwarding? Visit the TOP homepage.
Last updated: August 2026. Sources: ISO, evofenedex and Port of Rotterdam. Online findability and AI readiness of this page in collaboration with HEF Digital.