If you've ever planned a storage unit, container home, or freight setup, you know how confusing the measurements can get. Getting the width wrong means wasted space, poor planning, and extra costs.
This guide gives you clear, straight answers on shipping container width standard sizes, internal vs external measurements, and how 20ft and 40ft containers compare.
I've helped people plan container projects for years, and the width question comes up every single time. By the end of this, you'll know exactly what to measure and why it matters.
Standard Shipping Container Width Explained
The standard shipping container width is the same across almost every ISO container used worldwide. On the outside, it measures 8 feet or 2.438 meters.
On the inside, it's slightly narrower at 7 feet 8 inches or 2.352 meters. That difference comes from the thickness of the steel walls on both sides.
This width was fixed by ISO standards decades ago so containers could fit ships, trains, and trucks globally without any modifications.
Whether you're working in feet or meters, these numbers stay consistent across 20ft and 40ft containers.
Shipping Container Width by Container Size
Width doesn't change with container length here's what to expect for each size.
20ft Shipping Container Width (Standard and High Cube)
A 20ft container has an external width of 8 feet (2.438 m) and an internal width of 7 feet 8 inches (2.352 m). This stays consistent across both standard and high cube versions.
The high cube only adds extra height to the container, not extra width.
40ft Shipping Container Width (Standard and High Cube)
A 40ft container carries the same external width of 8 feet (2.438 m) and internal width of 7 feet 8 inches (2.352 m) as the 20ft unit.
The high cube version of the 40ft gives you more vertical space but does not change the width at all.
20ft vs 40ft Shipping Container Width Comparison
Both the 20ft and 40ft containers share the exact same width on the inside and outside. The only real difference between them is their length.
A 20ft gives about 1,170 cubic feet of space while a 40ft gives around 2,390 cubic feet.
Shipping Container Width in Different Measurement Units
Here are the exact width numbers in every unit you may need for your project.
Shipping Container Width in Feet
The external width in feet is 8 feet and the internal width is 7 feet 8 inches. These are the standard imperial measurements used across the United States and many other countries that follow imperial unit systems.
Shipping Container Width in Meters
In metric, the external width is 2.438 meters and the internal width is 2.352 meters. Metric measurements are the preferred choice for international shipping, engineering projects, and construction planning worldwide.
Quick Conversion Guide for Width Measurements
The external width of a shipping container is 8 feet, 2.438 meters, or 96 inches. The internal width measures 7 feet 8 inches, 2.352 meters, or 92.6 inches.
Each wall on both sides is roughly 1.7 inches or about 43 millimeters thick. These numbers cover all the units you are likely to need whether you are working on a shipping plan, a construction project, or a container conversion.
Shipping Container Width and Height Relationship
Width stays fixed but height is where containers give you real flexibility.
How Width and Height Work Together in Container Design
Width and height together define the total cross-sectional space you have inside a container. While the width stays fixed, the height can vary depending on the container type.
This cross-section is especially important when placing large equipment, vehicles, or built-in structures inside.
Standard vs High Cube Height Impact on Space
A standard container has an internal height of 7 feet 10 inches (2.393 m) while a high cube container gives you about 8 feet 10 inches (2.698 m) of internal height.
That extra foot of vertical space makes a noticeable difference for container homes, workshops, and any build that needs ceiling clearance.
Why Shipping Container Width Remains Consistent
Container width is kept the same globally so that every container fits on the same ships, trains, and trucks without modification.
This standardization has been in place since ISO regulations were established in the 1960s. Changing the width would disrupt the entire global logistics system.
20ft Shipping Container Width Explained
Here is what the width of a 20ft container actually gives you inside and out.
20 Foot Shipping Container Width (Internal and External)
The external width of a 20ft container is 8 feet (2.438 m) and the internal width is 7 feet 8 inches (2.352 m).
These measurements remain the same whether the container is a standard or high cube version. Width does not change based on the height type of the container.
Common Uses of 20ft Container Width
The 7 feet 8 inch internal width is wide enough to fit two standard pallets side by side comfortably.
This makes it a practical choice for small workshops, personal storage units, and single-room office or site conversions.
Space Capacity and Practical Applications
A standard 20ft container holds about 1,172 cubic feet or 33.2 cubic meters of internal space.
That combination of width, length, and height makes it a reliable option for small businesses, construction site storage, and compact single-room container builds.
40ft Shipping Container Width Explained
Here is what the width of a 40ft container gives you and why it suits larger projects.
40 Foot Shipping Container Width (Internal and External)
The external width of a 40ft container is 8 feet (2.438 m) and the internal width is 7 feet 8 inches (2.352 m), the same as a 20ft unit. The significant difference between the two is the extra 20 feet of length, not the width.
Common Uses of 40ft Container Width
The consistent 7 feet 8 inch internal width makes 40ft containers well suited for bulk cargo shipping, building multi-room container homes, setting up retail pop-up spaces, and storing large equipment or machinery.
Why 40ft Containers Are Preferred for Large Storage Needs
A 40ft container holds about 2,390 cubic feet or 67.7 cubic meters of internal space, which is more than double what a 20ft container offers.
The width stays the same but the extra length means you can handle far more volume without needing two separate container units.
Tips for Understanding Shipping Container Width
Even small width differences can affect storage and loading efficiency.
- Always compare internal vs external width before planning your layout or storage setup
- Use meters for construction and engineering work as it gives more precise measurements
- Check the door opening width separately as it is narrower than the internal width
- Compare 20ft and 40ft widths side by side to choose the right container for your space needs
- Remember that width always stays standard across all sizes while height is what varies between container types
Conclusion
I've seen many container projects go sideways simply because someone planned around the external width instead of the internal one.
That small difference of 3.4 inches matters more than people expect. Now you have everything you need, the exact shipping container width in feet, meters, and inches, plus a clear picture of how 20ft and 40ft containers compare.
If this guide helped you, drop a comment below and let us know what you're planning. We'd love to hear about your project.
Frequently Asked Questions
What is the standard shipping container width?
The standard external width is 8 feet or 2.438 meters for all ISO containers. The internal width is slightly narrower at 7 feet 8 inches or 2.352 meters.
Is the width the same for 20ft and 40ft containers?
Yes, both 20ft and 40ft containers have the exact same external width of 8 feet (2.438 m). The only difference between them is their length, not their width.
What is the internal width of a shipping container?
The internal width of a standard shipping container is 7 feet 8 inches or 2.352 meters. This is the actual usable space you have available inside the container.
What is the shipping container width in meters?
The external width is 2.438 meters and the internal width is 2.352 meters. These metric measurements apply to all standard ISO containers regardless of their length.
What is the difference between internal and external width?
The difference is about 86 millimeters or 3.4 inches in total. This gap comes from the thickness of the steel walls built into both sides of the container.
