Shipping container dimensions
Shipping container dimensions are the single most important specification to understand before you buy, rent, load, or modify a container. The numbers that appear on every spec sheet — lengths of 10, 20, or 40 feet, a near-universal 8-ft width, and heights of 8 ft 6 in or 9 ft 6 in — are not arbitrary. They are locked down by an international standard called ISO 668, which guarantees that a container loaded in Shanghai can sit on a truck in Chicago and a crane in Rotterdam without anyone having to measure it a second time.
This guide explains every dimension you will encounter, from the exterior footprint that determines road clearance to the interior space and door opening that determine what actually fits inside. It also covers the weight figures — tare, payload, and maximum gross weight — that decide whether your load is legal to transport.
What Are the Standard Shipping Container Dimensions?
A standard general-purpose (or “dry”) shipping container is 8 feet (2.44 m) wide and 8 ft 6 in (2.59 m) tall on the outside. The two dominant lengths are 20 feet (6.06 m) and 40 feet (12.19 m). This is the combination that accounts for the vast majority of the world’s container fleet.
There is also a taller variant called a high cube, which measures 9 ft 6 in (2.90 m) on the outside — exactly one extra foot of vertical clearance. High cubes come in all the standard lengths but are most common in the 40 ft size.
The table below summarizes the most common configurations. Note that “standard” describes the height (8 ft 6 in), not the length.
| Container Type | External L × W × H | Internal L × W × H | Door Opening W × H | Internal Capacity |
|---|---|---|---|---|
| 10 ft Standard | 9’9.75″ × 8′ × 8’6″ | 9’3″ × 7’8″ × 7’10” | 7’8″ × 7’5″ | ~561 cu ft |
| 20 ft Standard | 19’10.5″ × 8′ × 8’6″ | 19’4″ × 7’8.5″ × 7’10” | 7’8″ × 7’6″ | ~1,172 cu ft (33.2 m³) |
| 20 ft High Cube | 19’10.5″ × 8′ × 9’6″ | 19’4″ × 7’8.5″ × 8’10” | 7’8″ × 8’6″ | ~1,315 cu ft (37.2 m³) |
| 40 ft Standard | 40′ × 8′ × 8’6″ | 39’5″ × 7’8.5″ × 7’10” | 7’8″ × 7’6″ | ~2,390 cu ft (67.7 m³) |
| 40 ft High Cube | 40′ × 8′ × 9’6″ | 39’5″ × 7’8.5″ × 8’10” | 7’8″ × 8’6″ | ~2,694 cu ft (76.4 m³) |
| 45 ft High Cube | 45′ × 8′ × 9’6″ | 44’5″ × 7’8.5″ × 8’10” | 7’8″ × 8’6″ | ~3,040 cu ft (86.1 m³) |
Key point: External and internal dimensions always differ. The steel walls, door frame, and corner castings consume roughly 4 inches of width, 8 inches of height, and up to 8 inches of length. Never plan a load using the exterior numbers alone.
How Wide Is a Shipping Container?
A standard shipping container is 8 feet (2.438 m) wide on the exterior, and this measurement is nearly universal across the entire ISO fleet, from the smallest 10 ft unit to the largest 45 ft box. It is one of the few container dimensions that almost never changes.
Inside, the usable width shrinks to about 7 ft 8 in (2.35 m) because each corrugated steel side wall takes up roughly 2 inches.
There is one important exception. 53-foot intermodal containers — the oversized units used for North American domestic rail and truck freight — are built to a wider 8 ft 6 in (2.59 m) standard. These “domestic” containers are designed for road and rail within a single country and generally do not travel by ocean vessel, which is why they can exceed the ISO ocean-going width.
The fixed 8-ft width has a practical consequence worth remembering: you cannot fit two pallets side by side across the floor of a standard container if each pallet is the common 40-inch (1.0 m) width — two such pallets total 80 inches, which exceeds the 92-inch interior width only in theory, but the practical limitation is the door opening width, discussed below.
How Tall Is a Shipping Container?
There are exactly two external heights you need to know:
- Standard height: 8 ft 6 in (2.591 m)
- High cube: 9 ft 6 in (2.896 m)
The difference is precisely one foot, and “high cube” simply means “one foot taller.” This extra foot is taken up almost entirely as additional interior headroom, which is why high cubes are so popular for conversions: the extra vertical space accommodates insulation, ceiling panels, lighting, and ventilation without making the space feel cramped.
Internally, a standard container offers about 7 ft 10 in (2.39 m) of vertical clearance, while a high cube offers about 8 ft 10 in (2.70 m). For shipping bulky goods, that extra foot is frequently the difference between a load that fits and a load that has to be shipped loose or in a flat rack.
Where Did These Dimensions Come From? (History of Container Size Standardization)
The idea of moving goods in a standardized steel box is credited to American trucking entrepreneur Malcolm McLean, who launched the first container ship, the Ideal X, in 1956. But the consistency of container dimensions — the reason every container is 8 feet wide today — is the result of a decade of international negotiation that followed.
In the 1950s and early 1960s, competing operators used competing boxes. Matson used one size, Sea-Land (McLean’s company) another, and European railways a third. Cargo still had to be re-handled at every transfer point, defeating the entire purpose of containerization.
The breakthrough came through the International Organization for Standardization (ISO), which published the first version of its container standard in the mid-1960s. The committee settled on the 8 ft (2.44 m) width as a compromise between American road limits (allowable width on highways) and European railway loading gauges. The length units of 20 ft and 40 ft became the building blocks, and ISO 668 was born — the standard that still governs “series 1” freight containers today.
The TEU — twenty-foot equivalent unit — is a direct product of this standardization. It is not a physical box but a counting unit: a 20 ft container equals one TEU, a 40 ft container equals two TEUs, and so on. Port statistics, vessel capacity, and freight rates are all expressed in TEUs precisely because the physical container dimension is now fixed and universal.
How Do Internal, External, and Door Dimensions Differ?
Three different sets of numbers appear on every container spec sheet, and they each answer a different question. Confusing them is one of the most common — and most expensive — mistakes in freight planning.
External dimensions (what the world sees)
These govern everything outside the box: whether the container fits on a truck chassis, clears a bridge or tunnel, and occupies the right cell on a container ship. External dimensions are fixed by ISO 668 for interchangeability.
Internal dimensions (what fits inside)
These govern your cargo. Because walls, floor, and roof have real thickness, the internal length is typically 6–8 inches shorter than the external, the internal width about 4 inches narrower, and the internal height about 8 inches lower.
Door opening (the real bottleneck)
This is the measurement that surprises people most. The cargo opening at the rear of a standard container is about 7 ft 8 in wide by 7 ft 6 in tall — notably smaller than the interior cross-section, because the door frame and header reinforce the opening. A piece of cargo may physically fit inside the box’s volume, yet be unable to pass through the door.
The table below shows the internal-to-external difference for a typical 40 ft standard container:
| Measurement | External | Internal | Difference |
|---|---|---|---|
| Length | 12,192 mm (40 ft) | 12,032 mm (39 ft 5 in) | ~160 mm (6.3 in) |
| Width | 2,438 mm (8 ft) | 2,352 mm (7 ft 8.5 in) | ~86 mm (3.4 in) |
| Height | 2,591 mm (8 ft 6 in) | 2,393 mm (7 ft 10 in) | ~198 mm (7.8 in) |
| Door height | — | 2,292 mm (7 ft 6 in) | ~0.3 m below roof |
Rule of thumb: allocate about 6 inches of length, 4 inches of width, and 8 inches of height to the container’s structure when converting from exterior to interior figures.
What Is the Difference Between a Standard and a High Cube Container?
The only difference is height. A standard container is 8 ft 6 in tall; a high cube adds one vertical foot to 9 ft 6 in. Length and width are identical.
That single foot has cascading effects:
| Feature | Standard (8’6″) | High Cube (9’6″) |
|---|---|---|
| External height | 2.591 m | 2.896 m |
| Internal height | ~2.39 m (7’10”) | ~2.70 m (8’10”) |
| Door opening height | ~2.28 m (7’6″) | ~2.58 m (8’6″) |
| 40 ft internal capacity | 67.7 m³ | 76.4 m³ |
| Typical use | General cargo, cost-sensitive freight | Tall cargo, storage, conversions |
The extra foot increases a 40 ft container’s volume by about 13% — but it also raises the tare (empty) weight slightly, and in some regions the taller unit can trigger higher road-clearance restrictions. For shipping dense, heavy cargo, the standard height is usually the right choice; for voluminous or tall cargo — and for most container-home or office conversions — the high cube is preferred.
Shipping Container Weight Terminology: Tare, Payload, and Gross Weight
Dimensions are only half the story. Every container is also stamped with weight ratings, and understanding the vocabulary is essential to loading legally.
- Tare weight — the weight of the empty container itself. A 20 ft unit tares around 2,100–2,300 kg; a 40 ft unit around 3,500–3,800 kg.
- Maximum gross weight (MGW) — the combined weight of container plus cargo that the vessel and road equipment are rated to carry. For a typical 20 ft container this is 30,480 kg (67,200 lb); many 40 ft units are rated 32,500 kg (71,650 lb).
- Payload (or net load) — the difference: how much cargo you may actually put inside. Roughly 28,000 kg for a 20 ft and 26,500–28,750 kg for a 40 ft container.
| Container | Typical Tare | Typical MGW | Usable Payload |
|---|---|---|---|
| 20 ft Standard | ~2,200 kg (4,850 lb) | 30,480 kg (67,200 lb) | ~28,280 kg (62,350 lb) |
| 40 ft Standard | ~3,750 kg (8,270 lb) | 32,500 kg (71,650 lb) | ~28,750 kg (63,380 lb) |
| 40 ft High Cube | ~3,900 kg (8,600 lb) | 32,500 kg (71,650 lb) | ~28,600 kg (63,050 lb) |
Important: Your national limits usually come into force before the container’s MGW does. Many countries cap total road weight below the container’s theoretical maximum, so a container rated for 32,500 kg may still be restricted to a lower figure once placed on a truck chassis. Always check road and rail limits for the specific route.
What Are the Less Common Container Sizes?
Beyond the 20 ft and 40 ft workhorses, a handful of other lengths exist for specific jobs:
- 10 foot containers — compact units (external length ~2.99 m) used for small storage, site offices, and tight-access deliveries. Because demand is low, they are often more expensive than a 20 ft unit despite being half the size.
- 45 foot high cube — popular for volume (rather than heavy) cargo; holds roughly 86 m³ against the 40 ft’s 76 m³.
- 48 and 53 foot containers — North American domestic units. The 53 ft unit is also 8 ft 6 in wide, one of the few width exceptions in containerization.
Specialized types — refrigerated (reefer), open-top, flat rack, pallet-wide, and tank containers — all share the same external 8-ft width and 20/40-ft length grid, which is exactly what ISO standardization was designed to achieve: any container, any ship, any port.
How Much Can You Fit in a Shipping Container? (Practical Capacity Examples)
Volume tells only part of the story. Cargo that fits the cubic capacity can still be blocked by the door or the floor plan. The loading examples below show why each constraint is checked separately.
| Scenario | Calculation | What it reveals |
|---|---|---|
| 20 Euro-pallets (1.2 × 0.8 × 1.5 m each) in a 40 ft container | 28.8 m³ and ~10,000 kg of cargo | Below both volume and weight limits — but you must confirm the pallet grid actually fits through the 7 ft 6 in door and across the 92 in floor. |
| Bulky but light furniture in a 40 ft HC | Low weight, high volume | The high cube’s extra 13% volume matters more than its payload rating. |
| Dense machinery in a 20 ft standard | High weight, low volume | Payload — not volume — is the binding constraint; 28 tonnes fills far less than 33 m³. |
The recurring lesson is that volume, weight, and door clearance must each be planned independently. Internal capacity is not a guarantee that an equivalent volume of packaged goods will fit.
What Do People Get Wrong About Shipping Container Dimensions?
Several misconceptions recur constantly:
- “The 20 ft / 40 ft figure is the usable length.” It is the nominal external length. The interior is nearly half a foot shorter.
- “If it fits inside, it fits through the door.” False. The door opening is narrower and shorter than the interior cross-section.
- “All containers are 8 feet wide, everywhere.” Mostly true for ocean-going ISO boxes, but 53 ft domestic containers measure 8 ft 6 in wide.
- “High cube means taller and wider.” It only means taller. Width is unchanged.
- “A bigger container is always more expensive.” A 10 ft container often costs more than a 20 ft unit because of low supply and niche demand.
Where Is Shipping Container Standardization Heading?
The physical dimensions defined in ISO 668 have been stable for decades, and that stability is the point — retrofitting the entire world’s ports, ships, and crane systems is prohibitively expensive. What continues to evolve is how those fixed dimensions are used: higher-capacity vessels stow more 40 ft and 45 ft units per cell, smart containers use the interior space more efficiently, and the conversion market (homes, offices, studios) now routinely specifies high cube dimensions specifically for their extra vertical clearance.
For anyone planning freight, storage, or a build, the practical future is the same as the present: know your internal dimensions, check the door opening, and confirm the weight before you commit.
Frequently Asked Questions
How wide is a shipping container?
Outside, a standard shipping container is 8 feet (2.44 m) wide. Inside, the usable width is about 7 ft 8 in (2.35 m). The exception is the 53 ft domestic container, which is 8 ft 6 in wide.
How tall is a shipping container?
There are two heights: standard is 8 ft 6 in (2.59 m) and high cube is 9 ft 6 in (2.90 m). Internal headroom is about 7 ft 10 in for standard and 8 ft 10 in for high cube.
What are the dimensions of a 20 ft shipping container?
Externally about 19 ft 10.5 in long × 8 ft wide × 8 ft 6 in tall (6.06 × 2.44 × 2.59 m). Internally about 19 ft 4 in × 7 ft 8.5 in × 7 ft 10 in (5.90 × 2.35 × 2.39 m), with a capacity of roughly 33 m³ (1,172 cu ft) and a usable payload near 28,000 kg.
What are the dimensions of a 40 ft shipping container?
Externally about 40 ft long × 8 ft wide × 8 ft 6 in tall (12.19 × 2.44 × 2.59 m). Internally about 39 ft 5 in × 7 ft 8.5 in × 7 ft 10 in (12.03 × 2.35 × 2.39 m), with a capacity of about 67.7 m³ (2,390 cu ft). A 40 ft high cube offers roughly 76.4 m³ and internal height of 8 ft 10 in.
What is the difference between internal and external dimensions?
External dimensions are the box’s overall footprint and govern transport clearance. Internal dimensions are smaller — by about 6 inches in length, 4 inches in width, and 8 inches in height — because of the wall, floor, roof, and door structure.
Why is the door opening smaller than the interior?
The rear door frame and header beam reinforce the opening, reducing it to about 7 ft 8 in wide × 7 ft 6 in tall on a standard container (8 ft 6 in tall on a high cube). Tall or wide cargo must fit through this opening, not just inside the volume.
What does TEU mean?
TEU stands for “twenty-foot equivalent unit,” a counting measure based on the standardized 20 ft container. One 20 ft container equals one TEU; a 40 ft container equals two TEUs.
What are tare, payload, and maximum gross weight?
Tare is the empty container’s weight. Maximum gross weight is the permitted combined weight of container plus cargo. Payload is the difference — how much cargo you can legally load.
Are shipping container dimensions the same worldwide?
Yes, for ISO 668 ocean-going containers. The 8-ft width and 20/40-ft length grid are internationally standardized, which is what allows containers to move seamlessly between ships, trucks, and trains globally.
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