Container dimensions chart?
A container dimensions chart is a structured reference table that displays the key measurements of standardized shipping containers — external length, width, and height; internal dimensions; door opening sizes; and weight ratings such as tare, payload, and maximum gross weight. It is the single most important reference tool for anyone involved in freight forwarding, warehousing, international trade, or even architectural design using repurposed containers. Whether you are calculating how many pallets fit into a 40-foot container, determining whether a piece of machinery clears the door opening, or verifying compliance with ISO 668, the dimensions chart is where you start.
Definition: A container dimensions chart is a tabular summary of the physical specifications — external, internal, and door-opening measurements — plus weight capacities of intermodal freight containers, organized by container type and nominal length.
Unlike a container specification sheet, which drills into the engineering details of a single container type, a dimensions chart puts all major container types side by side so you can compare at a glance. It is the difference between a zoom lens and a wide-angle lens, and in logistics, you almost always need both.
Where Did Container Dimensions Charts Come From?
Before 1956, there was no such thing as a container dimensions chart — because there was no such thing as a standardized shipping container. Cargo was loaded and unloaded piece by piece, a process called breakbulk shipping, which was slow, labor-intensive, and expensive. A single ship might carry crates, barrels, sacks, and pallets of every imaginable shape and size, and port workers spent days loading and unloading each vessel.
The modern container was born on April 26, 1956, when a trucking entrepreneur named Malcom McLean loaded 58 aluminum truck bodies onto the converted tanker ship Ideal X in Newark, New Jersey, and sailed them to Houston, Texas. McLean’s insight was not the box itself — boxes had been used for decades — but the idea that the box should remain sealed and unopened from origin to destination, moving seamlessly between truck, train, and ship. This was the birth of intermodal freight.
Why Dimensions Had to Be Standardized
A single shipping container that moves across trucks, trains, and ships only works if everyone agrees on the same dimensions. By the early 1960s, multiple incompatible container systems were proliferating. A container built for one shipping line would not fit on another’s chassis, railcar, or vessel. The industry needed a standard.
Between 1961 and 1968, the International Organization for Standardization (ISO) — through its technical committee ISO/TC 104, Freight Containers — worked to define the dimensions that would govern global container shipping. The result was ISO 668, first published in 1968 and revised multiple times since, most recently in 2020. ISO 668 defines the external dimensions, minimum internal dimensions, minimum door opening sizes, and maximum gross weight ratings for Series 1 freight containers.
The most consequential decision made by ISO/TC 104 was to set the uniform width of all Series 1 containers at 2,438 mm (8 feet). This was not arbitrary — it was the widest dimension that could fit on the highway networks of the time, particularly in Europe and the United States. Once the width was locked in, everything else followed: chassis design, railcar dimensions, crane spreader bars, and the cellular guides on container ships.
Containers built to ISO 668 standards are called ISO containers. Today, over 95% of intermodal containers worldwide comply with ISO standards, and the container dimensions chart is essentially a human-readable summary of the key dimensional data contained in ISO 668 and its companion standards.
How Are Shipping Container Dimensions Measured?
Understanding a container dimensions chart requires knowing exactly what is being measured and from where. The three measurement categories that appear on every chart are not interchangeable, and confusing them is one of the most common mistakes in cargo planning.
External Dimensions
External dimensions are measured from the outermost structural points of the container, including corner castings. These are the dimensions that matter for vessel slot allocation, chassis fit, railcar clearance, and crane handling. ISO 668 defines the external dimensions with extremely tight tolerances because they must work across every mode of transport in the world.
| External Dimension | Standard Value | Purpose |
|---|---|---|
| Length | 6,058 mm (20 ft), 12,192 mm (40 ft) | Determines chassis length, vessel slot |
| Width | 2,438 mm (8 ft) | Universal — fits all handling equipment |
| Height (standard) | 2,591 mm (8 ft 6 in) | Fits under bridges, tunnels, overhead wires |
| Height (high cube) | 2,896 mm (9 ft 6 in) | Extra 305 mm of vertical clearance |
Internal Dimensions
Internal dimensions are measured from the inside faces of the container walls, floor, and ceiling. These are the dimensions that matter for cargo loading, pallet configuration, and volume calculations. Because the walls, floor, and roof have thickness, the internal dimensions are always smaller than the external dimensions. The difference is substantial — the internal width of a standard container is approximately 2,352 mm (7 ft 8.6 in), which is 86 mm (3.4 inches) narrower than the external width. That lost width is occupied by the corrugated steel walls and the structural frame.
Door Opening Dimensions
Door opening dimensions are measured from the inside edges of the door frame — the actual clear opening through which cargo must pass. The door opening is always smaller than the internal cross-section because the door frame itself occupies space. On a standard 20-foot container, the door opening is approximately 2,340 mm wide by 2,280 mm high. If your cargo is 2,350 mm wide, it will fit inside the container (internal width: 2,352 mm) but it will never get through the door (opening width: 2,340 mm). This is the single most common mistake made by first-time shippers.
What Do Tare, Payload, and Max Gross Weight Mean?
Every container dimensions chart includes weight ratings. These three terms are the foundation of container weight planning:
| Term | Definition | Example (20 ft Standard) |
|---|---|---|
| Tare Weight | The empty weight of the container itself | 2,200 kg (4,850 lbs) |
| Payload (Net Load) | The maximum weight of cargo the container can carry | 28,280 kg (62,350 lbs) |
| Max Gross Weight (MGW) | The total maximum weight of container + cargo combined | 30,480 kg (67,200 lbs) |
The relationship is simple: Payload = MGW − Tare. If you know any two, you can calculate the third. The critical rule is that the gross weight — container plus cargo — must never exceed the MGW. Road weight limits and crane capacities are also constraints, but the MGW is the container’s own structural limit.
What Are the Standard Shipping Container Dimensions?
The most commonly used shipping containers are the 20-foot standard (often called a 1 TEU container) and the 40-foot standard (a 2 TEU or 1 FEU container). The 10-foot container is also widely used for storage and smaller shipments. All standard containers share the same external width (8 ft / 2,438 mm) and height (8 ft 6 in / 2,591 mm).
Complete Standard Container Dimensions Chart
| Specification | 10 ft Standard | 20 ft Standard | 40 ft Standard |
|---|---|---|---|
| External Length | 2,991 mm (9 ft 9.7 in) | 6,058 mm (19 ft 10.5 in) | 12,192 mm (40 ft) |
| External Width | 2,438 mm (8 ft) | 2,438 mm (8 ft) | 2,438 mm (8 ft) |
| External Height | 2,591 mm (8 ft 6 in) | 2,591 mm (8 ft 6 in) | 2,591 mm (8 ft 6 in) |
| Internal Length | 2,840 mm (9 ft 3.8 in) | 5,898 mm (19 ft 4.2 in) | 12,032 mm (39 ft 5.7 in) |
| Internal Width | 2,352 mm (7 ft 8.6 in) | 2,352 mm (7 ft 8.6 in) | 2,352 mm (7 ft 8.6 in) |
| Internal Height | 2,393 mm (7 ft 10.2 in) | 2,393 mm (7 ft 10.2 in) | 2,393 mm (7 ft 10.2 in) |
| Door Width | 2,340 mm (7 ft 8.1 in) | 2,340 mm (7 ft 8.1 in) | 2,340 mm (7 ft 8.1 in) |
| Door Height | 2,280 mm (7 ft 5.8 in) | 2,280 mm (7 ft 5.8 in) | 2,280 mm (7 ft 5.8 in) |
| Internal Volume | ~15.9 m³ (562 ft³) | ~33.2 m³ (1,172 ft³) | ~67.7 m³ (2,390 ft³) |
| Floor Area | ~6.7 m² (72 ft²) | ~13.9 m² (149 ft²) | ~28.3 m² (305 ft²) |
| Tare Weight | 1,300 kg (2,866 lbs) | 2,200 kg (4,850 lbs) | 3,750 kg (8,268 lbs) |
| Payload | 8,860 kg (19,534 lbs) | 28,280 kg (62,350 lbs) | 26,730 kg (58,929 lbs) |
| Max Gross Weight | 10,160 kg (22,400 lbs) | 30,480 kg (67,200 lbs) | 30,480 kg (67,200 lbs) |
Note: The 40-foot container carries a slightly lower payload than the 20-foot container despite being twice the length. This is because the 40-foot container itself is heavier (higher tare), and they share the same MGW limit. If you are shipping dense cargo like steel or machinery, you may reach the weight limit of a 40-foot container before you fill it. For volume-constrained cargo like furniture or textiles, the 40-foot container is more efficient.
What Are High Cube Container Dimensions?
High cube containers are identical in length and width to standard containers but have an extra 305 mm (1 foot) of internal height. This additional height increases the internal volume by approximately 13%, making high cubes the preferred choice for voluminous but relatively lightweight cargo — everything from furniture and automotive parts to wind turbine components and agricultural machinery.
The external height of a high cube container is 2,896 mm (9 ft 6 in) compared to the standard 2,591 mm (8 ft 6 in). The internal height is approximately 2,698 mm (8 ft 10.2 in) compared to the standard 2,393 mm (7 ft 10.2 in). That extra 305 mm of ceiling clearance is the difference between stacking pallets three-high versus two-high in many configurations.
High Cube Container Dimensions Chart
| Specification | 20 ft High Cube | 40 ft High Cube | 45 ft High Cube | 53 ft High Cube |
|---|---|---|---|---|
| External Length | 6,058 mm (19 ft 10.5 in) | 12,192 mm (40 ft) | 13,716 mm (45 ft) | 16,154 mm (53 ft) |
| External Width | 2,438 mm (8 ft) | 2,438 mm (8 ft) | 2,438 mm (8 ft) | 2,590 mm (8 ft 6 in) |
| External Height | 2,896 mm (9 ft 6 in) | 2,896 mm (9 ft 6 in) | 2,896 mm (9 ft 6 in) | 2,896 mm (9 ft 6 in) |
| Internal Length | 5,898 mm (19 ft 4.2 in) | 12,032 mm (39 ft 5.7 in) | 13,556 mm (44 ft 5.7 in) | 16,002 mm (52 ft 6 in) |
| Internal Width | 2,352 mm (7 ft 8.6 in) | 2,352 mm (7 ft 8.6 in) | 2,352 mm (7 ft 8.6 in) | 2,490 mm (8 ft 2 in) |
| Internal Height | 2,698 mm (8 ft 10.2 in) | 2,698 mm (8 ft 10.2 in) | 2,698 mm (8 ft 10.2 in) | 2,695 mm (8 ft 10.1 in) |
| Door Width | 2,340 mm (7 ft 8.1 in) | 2,340 mm (7 ft 8.1 in) | 2,340 mm (7 ft 8.1 in) | 2,490 mm (8 ft 2 in) |
| Door Height | 2,585 mm (8 ft 5.8 in) | 2,585 mm (8 ft 5.8 in) | 2,585 mm (8 ft 5.8 in) | 2,585 mm (8 ft 5.8 in) |
| Internal Volume | ~37.4 m³ (1,320 ft³) | ~76.4 m³ (2,700 ft³) | ~86.1 m³ (3,040 ft³) | ~107.8 m³ (3,806 ft³) |
| Tare Weight | 2,400 kg (5,291 lbs) | 3,900 kg (8,598 lbs) | 4,200 kg (9,259 lbs) | 5,000 kg (11,023 lbs) |
| Payload | 28,080 kg (61,909 lbs) | 26,580 kg (58,599 lbs) | 28,300 kg (62,389 lbs) | 29,290 kg (64,574 lbs) |
| Max Gross Weight | 30,480 kg (67,200 lbs) | 30,480 kg (67,200 lbs) | 32,500 kg (71,650 lbs) | 34,290 kg (75,597 lbs) |
Important: The 45-foot and 53-foot high cube containers are primarily used in domestic North American intermodal transport, not in international ocean shipping. The 53-foot container, in particular, is too wide at 2,590 mm (8 ft 6 in) to comply with ISO 668 Series 1 international standards, and cannot be stacked in the cellular guides of most ocean-going container vessels. It is the backbone of U.S. domestic rail and truck freight.
Standard vs. High Cube: A Side-by-Side Comparison
The height difference is the defining feature, but the practical implications extend beyond simply fitting taller cargo:
| Feature | Standard Container | High Cube Container |
|---|---|---|
| External Height | 2,591 mm (8 ft 6 in) | 2,896 mm (9 ft 6 in) |
| Internal Height | 2,393 mm (7 ft 10.2 in) | 2,698 mm (8 ft 10.2 in) |
| Door Height | 2,280 mm (7 ft 5.8 in) | 2,585 mm (8 ft 5.8 in) |
| Volume Increase vs. Standard | — | ~13% more |
| Best For | Dense, heavy cargo (steel, machinery, stone) | Voluminous, lighter cargo (furniture, plastics, textiles) |
| Road Transport | Generally unrestricted | May require route planning for low bridges |
| Cost | Lower | ~10–15% premium |
What Are Specialty Container Dimensions?
Beyond standard dry containers and high cubes, a range of purpose-built containers serve specific cargo types. Each has unique dimensional characteristics that a container dimensions chart must account for.
Open Top Container Dimensions
Open top containers lack a solid roof, replacing it with a removable tarpaulin cover and removable top cross-members. They are designed for cargo that is too tall to fit through the door of a standard container — such as machinery, large pipes, or construction materials — and must be loaded from above using a crane.
Open top containers are available in 20-foot and 40-foot lengths. Their external dimensions match the standard dry containers of the same length, but the internal height is effectively unlimited (governed only by the height of the cargo and any road/rail clearance restrictions). The door opening on an open top container also has a removable header bar, allowing oversized cargo to be loaded through the rear door when the header is removed.
Flat Rack Container Dimensions
Flat rack containers consist of a flat bed with fixed or collapsible end walls and no side walls or roof. They are used for cargo that exceeds the width or height of any enclosed container — heavy machinery, vehicles, boats, large industrial equipment, and construction materials.
Flat racks come in 20-foot and 40-foot lengths. The key dimensional data points are:
| Specification | 20 ft Flat Rack | 40 ft Flat Rack |
|---|---|---|
| External Length | 6,058 mm (19 ft 10.5 in) | 12,192 mm (40 ft) |
| External Width | 2,438 mm (8 ft) | 2,438 mm (8 ft) |
| Platform Height (deck height) | ~370 mm (14.6 in) | ~648 mm (25.5 in) |
| Payload | 27,950 kg (61,618 lbs) | 39,080 kg (86,160 lbs) |
| Max Gross Weight | 30,480 kg (67,200 lbs) | 45,000 kg (99,207 lbs) |
The deck height matters because it determines how much the cargo sits above the chassis. A 40-foot flat rack with a 648 mm deck height places the cargo significantly higher than a 20-foot flat rack, which can affect road clearance.
Refrigerated (Reefer) Container Dimensions
Refrigerated containers — reefers — are insulated, temperature-controlled containers with an integrated refrigeration unit mounted at the front. The refrigeration unit reduces the internal length compared to a dry container of the same external length. A 20-foot reefer typically has an internal length of approximately 5,448 mm (17 ft 10.5 in), compared to 5,898 mm for a dry container. The 40-foot high-cube reefer is the most common reefer type, with an internal length of approximately 11,584 mm (38 ft).
Reefers are almost always built as high cubes because the extra internal height is needed for air circulation above the cargo. The refrigeration unit itself requires clearance, and the internal floor includes T-shaped aluminum rails for airflow.
How Do You Read and Use a Container Dimensions Chart?
A container dimensions chart is only useful if you know how to interpret it correctly. The most common mistake — and the most expensive — is confusing internal dimensions with door opening dimensions, or assuming external dimensions are the ones that matter for loading.
Step-by-Step Guide to Interpreting a Dimensions Chart
- Identify your cargo’s critical dimension. Is it weight, length, width, or height that constrains your load? A container dimensions chart gives you all four, but you must know which one is the binding constraint.
- Check the door opening first. If your cargo cannot fit through the door, nothing else matters. The door opening is always narrower and shorter than the internal cross-section.
- Verify the internal length. Even if your cargo fits through the door, it must fit along the floor. The internal length of a 20-foot container is 5,898 mm — not 6,096 mm (20 feet). That 198 mm difference is the thickness of the front wall and door assembly.
- Calculate the weight budget. Subtract the tare weight from the MGW to get the payload. Then verify that your cargo weight does not exceed this payload. Also check road weight limits at origin and destination.
- Consider pallet configuration. The internal width of 2,352 mm accommodates two standard European pallets (1,200 mm × 800 mm) placed side by side lengthwise, or two standard U.S. pallets (48 in × 40 in) placed side by side crosswise. Knowledge of pallet dimensions is essential for maximizing container utilization.
Common Misconceptions About Container Dimensions
Misconception #1: “A 20-foot container is exactly 20 feet long.”
It is not. The nominal 20-foot length refers to the external length, which is 6,058 mm (19 ft 10.5 in). The internal length is shorter still at 5,898 mm. The name is a rounded approximation, not a precise measurement.
Misconception #2: “The internal width is 8 feet.”
It is not. The external width is 8 feet (2,438 mm). The internal width is approximately 2,352 mm (7 ft 8.6 in). The corrugated steel walls consume approximately 86 mm of width. This 86 mm gap is the reason why three standard pallets cannot fit side by side inside a container.
Misconception #3: “All containers of the same type have identical dimensions.”
They do not. ISO 668 defines minimum internal dimensions and maximum external dimensions. Manufacturers can — and do — build containers with slightly different internal dimensions as long as they meet the minimums. Always check the specific container’s data plate, not just the generic chart.
Misconception #4: “A 40-foot container holds twice as much weight as a 20-foot container.”
It does not. Both share the same MGW of 30,480 kg in most configurations. The 40-foot container is heavier, so its payload is actually lower than the 20-foot container’s payload.
Misconception #5: “High cube containers are taller and wider.”
They are taller, but not wider. The external width of a high cube container is the same 2,438 mm as a standard container. Only the 53-foot domestic high cube is wider at 2,590 mm.
How to Choose the Right Container Size Using a Chart
A container dimensions chart is fundamentally a decision-making tool. The process of choosing a container looks like this:
- Cargo weight exceeds 28,000 kg? → You need a 20-foot container (or a flat rack with a higher MGW), because the 40-foot container cannot carry that much payload.
- Cargo volume exceeds 33 m³? → You need at least a 40-foot standard container, or a 40-foot high cube if the volume is above 67 m³.
- Cargo height exceeds 2,280 mm? → It will not clear the door of a standard container. You need either a high cube container (door height 2,585 mm) or an open top container.
- Cargo width exceeds 2,340 mm? → It will not fit through the door of any standard enclosed container. You need a flat rack container.
- Cargo length exceeds 11,900 mm? → It will not fit in a 40-foot container. You need a 45-foot container, a flat rack with overhang, or breakbulk shipping.
The Future of Container Dimensions
Container dimensions have been remarkably stable since ISO 668 was first published in 1968. The 8-foot width and the 20-foot and 40-foot nominal lengths have not changed in over half a century — and they are unlikely to change for international ocean shipping, because the global infrastructure (ships, cranes, chassis, railcars) is built around them.
However, two trends are worth watching:
Larger domestic containers. The 53-foot container, already dominant in North American domestic freight, is gradually being adopted in other regions. Australia and parts of South America are seeing increased 48-foot and 53-foot usage on domestic corridors. These containers will never be international ISO containers, but their dimensions are increasingly relevant for anyone working in domestic logistics.
48-foot containers for international shipping. There is ongoing industry discussion about standardizing a 48-foot international container with a higher MGW. President Lines and other carriers have experimented with 48-foot containers on select routes. If adopted, a 48-foot ISO standard would represent the first major change to international container length dimensions in decades — and would require a new row in every container dimensions chart.
Frequently Asked Questions
How wide is a shipping container?
All ISO Series 1 shipping containers have an external width of exactly 2,438 mm (8 feet). The internal width is approximately 2,352 mm (7 ft 8.6 in). The door opening width is approximately 2,340 mm (7 ft 8.1 in). The 53-foot domestic container, used in North America, is wider at 2,590 mm (8 ft 6 in) externally and 2,490 mm (8 ft 2 in) internally.
How long is a shipping container?
Shipping containers come in nominal lengths of 10 feet, 20 feet, 40 feet, and 45 feet for international use, plus 48 feet and 53 feet for domestic use. The actual external length of a 20-foot container is 6,058 mm (19 ft 10.5 in), and a 40-foot container is 12,192 mm (40 ft exactly). Internal lengths are shorter: 5,898 mm for a 20-foot and 12,032 mm for a 40-foot.
How tall is a standard vs. high cube container?
A standard container has an external height of 2,591 mm (8 ft 6 in) and an internal height of approximately 2,393 mm (7 ft 10.2 in). A high cube container has an external height of 2,896 mm (9 ft 6 in) and an internal height of approximately 2,698 mm (8 ft 10.2 in). The difference is 305 mm (1 foot).
How many pallets fit in a 20-foot container? A 40-foot container?
A 20-foot container accommodates approximately 10 standard European pallets (1,200 mm × 800 mm) or 10 standard U.S. pallets (48 in × 40 in) in a single layer. A 40-foot container accommodates approximately 24 European pallets or 20–21 U.S. pallets. The exact count depends on pallet orientation and whether pallets are stacked.
What is the CBM of a 20-foot container?
The CBM (cubic meters) of a 20-foot standard container is approximately 33.2 m³. This is calculated by multiplying the internal length (5.898 m), internal width (2.352 m), and internal height (2.393 m). The 20-foot high cube has a CBM of approximately 37.4 m³. A 40-foot standard container has a CBM of approximately 67.7 m³.
What is a TEU and how does it relate to container dimensions?
TEU stands for Twenty-Foot Equivalent Unit. It is the standard unit for measuring container ship capacity and container terminal throughput. One 20-foot container equals 1 TEU. One 40-foot container equals 2 TEU (also called 1 FEU — Forty-Foot Equivalent Unit). The TEU is fundamentally tied to container dimensions: all ISO standard containers are multiples of the 20-foot length module, and this modularity is what makes the entire global container system interoperable.
How thick are shipping container walls?
Standard shipping container walls are made of 14-gauge corrugated Corten steel, approximately 1.9 mm (0.075 in) thick. The corrugation profile adds structural rigidity while keeping weight low. The combined thickness of both side walls (approximately 86 mm total, including the corrugation depth) is what reduces the internal width from 2,438 mm to 2,352 mm. The roof and floor are typically thicker — the roof uses 16-gauge steel and the floor consists of 28 mm plywood or bamboo over steel cross-members.
What is the difference between a container dimensions chart and a container specification sheet?
A container dimensions chart is a comparative reference table showing key measurements across multiple container types side by side. It is designed for quick comparison and high-level decision-making. A container specification sheet (or data sheet) is a detailed engineering document for a single container type, often including frame dimensions, corner casting dimensions, forklift pocket locations, lashing ring ratings, and structural test loads. The chart answers “which container should I use?” while the specification sheet answers “how do I engineer around this container?”
How are container dimensions verified?
Every ISO container carries a CSC (Convention for Safe Containers) safety approval plate — a permanently affixed metal plate that displays the container’s identification number, manufacturer, manufacturing date, maximum gross weight, tare weight, and other technical data. The dimensions on the plate are the authoritative values for that specific container. Dimensions charts provide nominal values; the CSC plate provides the actual values for the container you are standing in front of.
Why are container dimensions important for architectural and construction projects?
Repurposed shipping containers are increasingly used for homes, offices, retail spaces, and emergency shelters. Knowing the exact internal dimensions is critical for insulation planning, structural framing, and code compliance. The internal width of 2,352 mm becomes roughly 2,200 mm after insulation and drywall — a meaningful reduction that must be designed around from the start. The 2,280 mm door opening height is also an important constraint for building entries and interior headroom.