20 Foot High Cube container dimensions
If you have ever tried to load a machine that is just a few centimeters too tall for a standard shipping container, you already understand why the 20-foot high cube container exists. It provides the same floor area as the standard 20-foot box – the one every warehouse and freight forwarder knows – with an extra 12 inches (approximately 30 cm) of vertical space. That single foot changes the math on what you can transport, store, or build inside.
This guide covers every dimension that matters – exterior, interior, door openings, cubic volume, floor area, weight limits, and pallet layout – in every unit system you are likely to encounter in practice: feet and inches, meters and centimeters, and millimeters. It also addresses the practical questions that dimension tables alone cannot answer: why the door opening is the real bottleneck when loading, how a 20-foot HC differs structurally from a standard 20-foot, why these containers are harder to find than their 40-foot counterparts, and what people consistently get wrong in their specifications.
Quick overview: A 20-foot high cube container measures 20 ft × 8 ft × 9 ft 6 in externally (6.058 m × 2.438 m × 2.896 m) and provides approximately 37.4 cubic meters (1,320 cubic feet) of internal cargo space – roughly 15% more volume than a standard 20-foot container.
What are the exact dimensions of a 20-foot High Cube container?
The dimensions of a 20-foot high cube container are governed by the ISO 668 standard, an international standard that defines the classifications, dimensions, and load capacities of cargo containers. This standard ensures that a 20-foot HC loaded in Shanghai will fit on a truck in Rotterdam and on a train in Chicago. Within this standard, however, individual manufacturers have tight tolerances – generally ±5 mm on length, ±2 mm on width, and ±2 mm on height – so the numbers you see on a specification sheet may differ by a fraction of an inch from those on another. The table below represents a consensus among the major shipping lines and container manufacturers.
Exterior dimensions (all unit systems)
The external footprint is what determines transport compatibility. The “20-foot” designation refers to the length, and the “high cube” designation refers to the height of 9 ft 6 in – one foot taller than the standard container height of 8 ft 6 in.
| Measurement | Feet and inches | Meters | Millimeters |
|---|---|---|---|
| Length | 20 ft 0 in | 6.058 m | 6,058 mm |
| Width | 8 ft 0 in | 2.438 m | 2,438 mm |
| Height | 9 ft 6 in | 2.896 m | 2,896 mm |
All three external dimensions are firmly fixed by the ISO standard, and the width in particular – 8 feet (2,438 mm) – is the universal gauge across virtually all dry cargo containers in worldwide circulation, regardless of length or height.
Interior dimensions (all unit systems)
The interior dimensions are smaller than the exterior dimensions because the corrugated corten steel walls, plywood floor on steel, and roof panel all take up space. The walls alone consume approximately 4 inches (100 mm) of width loss and roughly 4 inches of height loss due to the ceiling panel and floor structure.
| Measurement | Feet and inches | Meters | Millimeters |
|---|---|---|---|
| Length | 19 ft 3 in – 19 ft 4 in | 5.89 – 5.90 m | 5,890 – 5,900 mm |
| Width | 7 ft 8 in – 7 ft 9 in | 2.35 – 2.36 m | 2,350 – 2,360 mm |
| Height | 8 ft 9 in – 8 ft 10 in | 2.67 – 2.69 m | 2,670 – 2,690 mm |
The ranges reflect legitimate manufacturer variation within ISO tolerances. A new, one-trip 20-foot HC will typically be at the upper end of these ranges; a well-used unit that has been repaired or repainted may measure slightly less.
Door opening dimensions – the critical loading constraint
This is the dimension that surprises first-time buyers: the door opening is significantly smaller than the internal cross-section. The double doors at the rear of the container are framed by a heavy steel header beam and corner posts that reduce both width and height.
| Measurement | Feet and inches | Meters | Millimeters |
|---|---|---|---|
| Door opening width | 7 ft 8 in | 2.34 m | 2,340 mm |
| Door opening height (new/one-trip) | 8 ft 5 in – 8 ft 6 in | 2.57 – 2.59 m | 2,570 – 2,590 mm |
| Door opening height (used/cargo-worthy) | 7 ft 6 in | 2.28 m | 2,280 mm |
The door opening height for a new or one-trip 20-foot high cube container is approximately 8 ft 5 in (2.58 m). That is roughly 4 to 5 inches less than the interior ceiling height due to the structural header beam that spans the top of the door frame. On used containers – especially those classified as cargo-worthy or wind and water tight – door height can drop to approximately 7 ft 6 in (2.28 m) if they were originally built to an older specification or if repairs have altered the door frame.
Practical rule of thumb: When loading tall cargo with a forklift, measure by the door opening height – not the interior ceiling height. Cargo that has half an inch of clearance from the interior ceiling will still not pass through the doors if it exceeds the header beam clearance.
How does a 20-foot High Cube compare to a standard 20-foot container?
A standard 20-foot shipping container – the most common container in global trade – measures 8 ft 6 in (2.59 m) in external height, with an internal height of approximately 7 ft 10 in (2.39 m). The 20-foot high cube adds exactly 12 inches (305 mm) of external height, and almost all of that translates into usable interior space.
Side-by-side dimension comparison
| Specification | Standard 20-foot | 20-foot High Cube | Difference |
|---|---|---|---|
| Exterior length | 20 ft (6.058 m) | 20 ft (6.058 m) | None |
| Exterior width | 8 ft (2.438 m) | 8 ft (2.438 m) | None |
| Exterior height | 8 ft 6 in (2.591 m) | 9 ft 6 in (2.896 m) | +12 in / +305 mm |
| Interior length | ~19 ft 4 in (5.89 m) | ~19 ft 4 in (5.89 m) | None |
| Interior width | ~7 ft 8 in (2.35 m) | ~7 ft 8 in (2.35 m) | None |
| Interior height | ~7 ft 10 in (2.39 m) | ~8 ft 10 in (2.69 m) | +12 in / +300 mm |
| Door opening width | 7 ft 8 in (2.34 m) | 7 ft 8 in (2.34 m) | None |
| Door opening height | ~7 ft 6 in (2.28 m) | ~8 ft 5 in (2.58 m) | +11 in / +300 mm |
| Interior volume | ~33.2 m³ (1,172 ft³) | ~37.4 m³ (1,320 ft³) | +4.2 m³ / +148 ft³ |
| Tare weight | ~2,100 kg (4,630 lb) | ~2,300 kg (5,070 lb) | +200 kg / +440 lb |
| Maximum payload | ~28,200 kg (62,170 lb) | ~28,100 kg (61,950 lb) | -100 kg / -220 lb |
What those extra 12 inches of height actually mean
That single foot of additional height translates into approximately 15% more interior volume – around 4 to 5 extra cubic meters – with no increase in the container’s footprint. In practical terms, that means:
- Double-stacking pallets becomes feasible. A standard 20-foot container typically holds 10 US standard pallets (40 in × 48 in) on the floor. With a high cube, you can stack a second layer on top – fitting up to 20 pallets – because the interior height accommodates two standard pallet heights plus handling space for a forklift.
- Human occupancy becomes comfortable. The interior ceiling of a standard container is approximately 7 ft 10 in. Add 2 inches of floor insulation and 2 inches of ceiling cladding for a container conversion project and you are down to 7 ft 6 in – usable, but tight for anyone over 6 feet tall. In a high cube, those same modifications leave you with approximately 8 ft 6 in of finished clear height, which matches residential ceiling heights.
- Machinery and equipment that reach 8 to 8.5 feet – generators, compact excavators, printing presses, large-format CNC machines – will pass through the doors and fit inside, while a standard container would leave them stranded on the dock.
What is the cubic volume and storage capacity of a 20-foot High Cube?
Cubic volume in all units
The internal cubic volume of a 20-foot high cube container is calculated by multiplying the internal length, width, and height. Using the median internal dimensions:
5.90 m × 2.35 m × 2.69 m = 37.3 m³ (metric)
19.33 ft × 7.71 ft × 8.83 ft = 1,316 ft³ (imperial)
Most manufacturers and shipping lines round this to 37.4 cubic meters or 1,320 cubic feet. For comparison, a standard 20-foot container provides approximately 33.2 m³ (1,172 ft³). The 4.2 m³ difference is equivalent to roughly five full-size household fridge-freezers of additional cargo space.
It is important to understand that these are theoretical maximums. In practice, usable volume is always lower due to irregular cargo shapes, packing inefficiencies, and the need to leave gaps for ventilation and cargo securing. A realistic loading factor for mixed general cargo in a container is 85–90% of theoretical volume, giving a practical capacity closer to 31–33 m³ (1,100–1,180 ft³).
Floor area
The floor area is simply the interior length multiplied by the interior width:
5.89 m × 2.35 m = 13.84 m² (approximately 150 square feet)
This is identical to a standard 20-foot container. The high cube advantage is exclusively vertical.
How many pallets fit in a 20-foot High Cube?
Pallet capacity depends on the pallet standard used, the loading pattern, and whether cargo can be stacked in two layers (which the extra high cube height makes possible).
| Pallet type | Pallet dimensions | Single layer (floor) | Two layers (HC only) |
|---|---|---|---|
| US Standard (GMA) | 40 in × 48 in (1,016 mm × 1,219 mm) | 10 pallets | 20 pallets |
| Euro pallet (EUR/EPAL) | 800 mm × 1,200 mm (31.5 in × 47.2 in) | 11 pallets | 22 pallets |
| ISO pallet | 1,000 mm × 1,200 mm (39.4 in × 47.2 in) | 9–10 pallets | 18–20 pallets |
The double-stacking numbers assume a typical loaded pallet height of approximately 1.0 to 1.2 meters (40–48 inches). Two such pallets stacked on top of each other total 2.0 to 2.4 meters, which fits comfortably within the 2.69-meter interior height while still leaving room for forklift mast clearance at the top. This is the biggest operational advantage of a high cube over a standard container for palletized cargo.
What are the weight specifications of a 20-foot High Cube container?
Shipping container weight limits are governed by a three-part system defined by ISO 668: tare weight, maximum gross weight, and payload.
Tare weight (empty container)
The tare weight of a 20-foot high cube container – the weight of the empty unit – ranges from approximately 2,200 to 2,400 kg (4,850 to 5,290 lb) for a steel dry cargo container. A new one-trip unit typically weighs around 2,300 kg (5,070 lb), which is roughly 200 kg (440 lb) more than an equivalent standard 20-foot container. The extra weight comes from taller corner posts, an extended door frame, and additional steel in the side panels to maintain structural rigidity at the increased height.
Maximum gross weight (MGW)
The MGW – sometimes called maximum rated mass or maximum gross mass – is the absolute limit on the combined weight of the container when loaded, including the container itself, its cargo, and any packing or securing materials. For a 20-foot ISO container, most shipping lines set this value at 30,480 kg (67,200 lb). This figure is set not only by the container’s structural limits, but also by road weight regulations for chassis, bridge laws, and crane capacities at port terminals.
Payload (net cargo capacity)
Payload is the difference between the MGW and the tare weight:
30,480 kg − 2,300 kg = 28,180 kg (approximately 62,130 lb)
In practice, payload varies slightly from unit to unit depending on the exact tare weight. A heavier container (with thicker flooring, additional coating, or modifications) will have proportionally lower payload. The practical payload range for a 20-foot HC is approximately 27,800 to 28,200 kg (61,300 to 62,170 lb).
Floor load capacity
Shipping container floors are designed to withstand concentrated loads from forklift wheels. A standard plywood floor on steel cross members in a 20-foot container is typically rated for a forklift with an axle load of up to 5,460 kg per running meter of floor length when the load is evenly distributed. However, point loads under a single forklift wheel – especially a small-diameter solid tire – can easily exceed this. When driving a forklift into a container, the realistic failure mode is not gross weight but concentrated load breaking through the plywood. Always check the axle and wheel loads of your forklift against the floor load capacity of the container before loading.
Where did the High Cube container come from? A brief history
Understanding why the high cube container exists – and why the 20-foot version is relatively uncommon – requires a brief look at the history of containerization.
The birth of ISO standardization
Before 1956, international cargo was shipped in barrels, crates, and sacks, loaded individually by dock workers. Malcolm McLean, a North Carolina trucking entrepreneur, changed that on April 26, 1956, when his converted tanker SS Ideal-X sailed from Newark to Houston carrying 58 standardized aluminum containers. That single voyage demonstrated that a container could move seamlessly from truck to ship to rail – and global trade never returned to the old ways.
By the end of the 1960s, the International Organization for Standardization (ISO) had issued ISO 668 and ISO 1496, which established the now-familiar dimensions: 8-foot width, 8-foot 6-inch height, and modular lengths of 10, 20, 30, and 40 feet. The 20-foot container became the industry’s basic unit of measure – the TEU, or twenty-foot equivalent unit.
When High Cubes entered the fleet
The high cube concept emerged in the 1970s, when shipping lines sought to maximize revenue per vessel slot. The trade-off was simple: a container that is one foot taller holds roughly 13–15% more volume while occupying the same deck space and the same chassis. Initial adoption focused on the 40-foot length – the 40-foot high cube became the workhorse of the Asia–Europe trade route, where bulky consumer goods (furniture, clothing, electronics in bulky retail packaging) filled the space before they reached the weight limit.
The 20-foot high cube followed, but never achieved the same ubiquity. The economics are simple: on a container ship, every slot on deck is a fixed length. A 20-foot HC uses the same slot as a standard 20-foot, but because most 20-foot cargo is dense and reaches weight limits before volume limits, the extra height is often wasted. The 20-foot HC remains a specialty product for specific cargo profiles – light but bulky, or tall and indivisible.
“Rarity” factor: As discussed in logistics forums (including a long thread on Reddit r/logistics), 20-foot high cube containers are genuinely less available than their standard 20-foot or 40-foot HC counterparts. Many freight forwarders do not carry them as part of their standard equipment pool. If you need one, you may have to specifically order it, pay a premium, or wait longer for availability – particularly if you are buying rather than renting.
What is a 20-foot High Cube container used for?
Industrial and commercial applications
The 20-foot HC is the container of choice when cargo is tall but fits within 20 feet of length. Common examples include:
- Generators and power equipment – large diesel generators often stand 7 to 8 feet tall on their frames. A standard container door will not admit them; a high cube will.
- Compact construction machinery – mini-excavators, skid-steer loaders, and scissor lifts, when the boom or protective frame exceeds the 7 ft 6 in threshold.
- Industrial presses and machine tools – many CNC machines, injection molding machines, and printing presses exceed standard container heights.
- Oversized HVAC ducting, pipe coils, and welded steel assemblies – items where cutting them down to fit a standard container would compromise structural integrity.
Storage and container conversion projects
The extra clear height transforms the user experience of a container used for human occupancy:
- Container offices and site huts: With 2 to 3 inches of floor insulation and a finished ceiling, a standard container leaves approximately 7 ft 4 in of clear height. A high cube leaves roughly 8 ft 4 in – the difference between “you can stand” and “you can stand comfortably without touching the ceiling.”
- Tiny homes and modular housing: The 20-foot HC is increasingly popular for single-module residential units. The extra ceiling height enables lofted sleeping, overhead storage, or simply a more open residential feel.
- Retail pop-ups and food stands: The height provides room for overhead menu boards, ventilation ducting, and lighting rigs without crowding the customer space.
Specialized variants
The 20-foot HC platform also appears in several specialized configurations:
- Double doors (DD): Doors on both ends. Useful for drive-through loading or when cargo needs to be accessed from both ends of a stacked configuration.
- Open side: One long side is fully openable, providing access by crane or forklift along the entire length. Interior dimensions are comparable to a standard 20-foot HC.
- High cube open top: The roof is a removable tarpaulin or removable steel cap. For example, a Hapag-Lloyd 20-foot Open Top High Cube has interior dimensions of approximately 5,892 mm × 2,347 mm with a variable-height roof opening – ideal for cargo that must be loaded by gantry crane.
- Pallet Wide High Cube: Slightly wider inside (approximately 2.42–2.44 m interior width versus the standard 2.35 m) to fit two Euro pallets side by side without wasted gap space. These are more common in European markets.
What are common misconceptions about 20-foot High Cube containers?
“They are just taller standard containers”
Structurally, a high cube container is not simply a standard container with taller side panels. The corner posts – the four vertical load-bearing columns that carry stacking loads – are longer and must resist greater buckling forces. The door header is reinforced for the taller opening. The corrugated side wall profile may differ to maintain rigidity across the larger panel area. These differences are why a 20-foot HC has a slightly higher tare weight, even though the floor and roof are the same steel thickness.
“The interior height is 9 feet 6 inches”
It is not. The exterior height is 9 ft 6 in (2,896 mm). The interior height is approximately 8 ft 10 in (2,690 mm). The 8-inch difference is consumed by the floor structure (plywood on steel cross members, adding roughly 27 mm), the roof panel and its corrugation (approximately 25–28 mm), and the top rail and header assemblies. If you need 9 feet of interior clear height, a 20-foot high cube will disappoint you. You would need a high cube open top and accept that the cargo protrudes above roof level.
“The door opening is the same as the interior”
As emphasized earlier, the door header beam subtracts approximately 4 to 5 inches of clear height compared to the interior ceiling. This is one of the most common loading mistakes: measuring cargo height against the interior specification and then discovering it will not pass through the rear frame. Always check the door opening height on the actual unit you are using – not the manufacturer’s nominal interior height.
“20-foot High Cubes are easy to find”
They are not. The global container fleet is dominated by standard 20-foot containers, 40-foot standard containers, and 40-foot high cubes. The 20-foot high cube is a relatively small fraction of the total fleet. If you are a buyer, expect a 10–20% premium over a comparable standard 20-foot container. If you are a shipper, confirm availability with your freight forwarder before building a logistics plan around 20-foot HC capacity.
“A 20-foot HC counts as more than one TEU”
It does not. TEU (twenty-foot equivalent unit) measures the length of a container, not its volume or height. A 20-foot high cube counts as exactly 1 TEU, the same as a standard 20-foot container. This creates an interesting pricing dynamic: a shipping line charges a per-TEU slot rate for a container that carries 15% more cargo volume than a standard TEU – which is precisely why high cubes are attractive for bulky cargo, and precisely why lines limit how many they make available on a given route.
Frequently asked questions
What are the dimensions of a 20-foot high cube container in feet and inches?
A 20-foot high cube container measures 20 ft 0 in long × 8 ft 0 in wide × 9 ft 6 in tall externally. Inside, it is approximately 19 ft 3 in long × 7 ft 8 in wide × 8 ft 10 in tall. The door openings measure approximately 7 ft 8 in wide × 8 ft 5 in tall on new units.
How tall is a 20-foot high cube container compared to a standard 20-foot container?
A standard 20-foot container is 8 ft 6 in (2.591 m) tall externally with an interior height of approximately 7 ft 10 in (2.39 m). A 20-foot high cube is 9 ft 6 in (2.896 m) tall externally with an interior height of approximately 8 ft 10 in (2.69 m) – exactly 12 inches taller in both external and internal dimensions.
What is the interior volume of a 20-foot high cube in cubic meters and cubic feet?
The interior volume is approximately 37.4 cubic meters, or 1,320 cubic feet. That is roughly 15% more than a standard 20-foot container, which offers approximately 33.2 cubic meters (1,172 cubic feet).
How much weight can a 20-foot high cube shipping container hold?
A 20-foot high cube has a maximum gross weight of 30,480 kg (67,200 lb) and a tare weight of approximately 2,300 kg (5,070 lb), giving a net payload of approximately 28,180 kg (62,130 lb). The exact payload varies slightly by manufacturer and unit age.
How many pallets fit in a 20-foot high cube container?
In a single layer on the floor, a 20-foot HC holds 10 US standard pallets (40 in × 48 in) or 11 Euro pallets (800 mm × 1,200 mm). Thanks to the extra height, double-stacking is possible, yielding up to 20 US pallets or 22 Euro pallets per container.
What is the door opening height of a 20-foot high cube?
The door opening height of a new 20-foot high cube is approximately 8 ft 5 in (2.58 m). On used or older units, it can be as low as 7 ft 6 in (2.28 m). The door opening is typically 4 to 5 inches lower than the interior ceiling height due to the structural header beam above the doors.
Are 20-foot high cube containers rare or hard to find?
Yes, 20-foot high cube containers are significantly less common than standard 20-foot containers or 40-foot high cubes. They represent a small fraction of the global container fleet, because most 20-foot cargo reaches weight limits before volume limits. Buyers should expect a 10–20% premium over a comparable standard 20-foot unit, and shippers should verify availability with their freight forwarder in advance.
What is the difference between a 20-foot standard and a 20-foot high cube?
The only dimensional difference is height: the high cube is exactly 12 inches (305 mm) taller both externally and internally. This adds approximately 4.2 cubic meters of volume, increases tare weight by about 200 kg, and enables double-stacking of pallets. Length, width, door width, and floor area are identical between the two types.
How thick are the walls of a 20-foot high cube container?
The corrugated corten steel wall panels are typically 1.6 mm to 2.0 mm thick (approximately 0.063 to 0.079 inches, or 16 to 14 gauge). The container’s structural strength comes from the corner posts and the corrugation geometry, not just the wall panel thickness.
Does a 20-foot high cube count as more than one TEU?
No. TEU (twenty-foot equivalent unit) measures only the container’s length. A 20-foot high cube counts as exactly 1 TEU, the same as a standard 20-foot container, despite carrying approximately 15% more cargo volume.
Břeclav, Czech Republic 
FREE DELIVERY
More container news...
What Are the Internal Dimensions of a 40 Foot Container?
A standard 40-foot dry shipping container has internal dimensions of 12,032 mm in length, 2,352 mm in width, and 2,395 mm in height — or approximately 39 feet 5⅝ inches × 7 feet 8⅝ inches × 7 feet 10¼ inches. These figures come from the published specifications of major shipping lines and align with the ISO 668 international standard for Series 1 freight containers. The internal capacity is roughly 67.7 cubic meters (2,390 cubic feet).
what is the internal dimensions of a 40 foot container
A standard 40-foot shipping container has internal dimensions of approximately 12.032 meters (39 feet 5⅝ inches) in length, 2.352 meters (7 feet 8⅝ inches) in width, and 2.395 meters (7 feet 10¼ inches) in height. These internal dimensions are significantly smaller than the external dimensions because the corrugated steel walls, structural frame, corner posts, and the floor system—composed of plywood and steel—occupy valuable space intended for cargo.
What Is the Shipping Cost for a 40ft High Cube Container?
The shipping cost for a 40ft high cube container is not a single number — it is a layered calculation spanning purchase price, international ocean freight, and local ground delivery. A used 40ft high cube container typically costs $1,550 to $5,500 to purchase, while a new one-trip unit runs $2,800 to $9,000 depending on condition, location, and whether delivery is included.
Shipping container types
Roughly 80% of everything you own traveled to you inside a steel box. Shipping containers—also called cargo containers, ISO containers, or “conex” boxes—are the backbone of global trade, carrying about 90% of the world’s non-bulk cargo across oceans, rails, and highways. Yet a “shipping container” is not one single object. It is a family of specialized steel boxes, each engineered for a specific kind of cargo: some vent, some freeze, some open from the top, and some have no walls at all.