Shipping Container & Conex Box Sizes: 20ft, 40ft & High Cube Guide
Not sure which conex box size is right for your project? Use our interactive 3D shipping container size and capacity calculator to visualize exactly how much space each unit offers — then request a free quote directly from the page. Whether you need a compact 20ft conex, a standard 40ft shipping container, or a spacious 40ft High Cube, US Conex offers new (One-Trip) and used units delivered directly to your door across the US.
20ft Shipping Container & Conex Box Dimensions
The 20ft conex box is the most versatile conex size in our lineup — compact enough to fit most residential driveways and commercial job sites, yet spacious enough to hold the contents of a 3-4 bedroom home. At 8 feet wide and 8'6" tall, it offers approximately 1,170 cubic feet of interior storage space.
It is the most popular choice for homeowners, contractors, and small businesses looking for a secure, weatherproof on-site storage solution. All used 20ft units are built from CORTEN anti-corrosive steel and may contain minor dents or surface rust. We also offer One-Trip containers that shipped once from the factory to the US and are essentially brand new.
Every container is inspected before delivery to confirm it is watertight, structurally sound, has intact floors, and has working doors.
Exterior Length: 20′
Exterior Width: 8’
Exterior Height: 8’6″
Interior Length: 19’4″
Interior Width: 7′ 8″
Interior Height: 7’10”
Tare: 4900 lbs
Max Payload: 62,000 lbs
40ft Shipping Container Size & Dimensions
The 40ft standard shipping container is the most common conex size in the world — and for good reason. With over 2,350 cubic feet of interior space, it offers double the capacity of a 20ft unit at a significantly lower cost per square foot. The standard exterior height of 8'6" keeps it compatible with all standard intermodal transport and delivery equipment.
All used 40ft conex containers are constructed with CORTEN anti-corrosive steel and 1-1/8" marine-grade plywood floors. They may show minor dents and surface rust, but every unit is confirmed wind and watertight before delivery. One-Trip units are available for buyers who need a pristine, factory-fresh container.
Exterior Length: 40′
Exterior Width: 8’
Exterior Height: 8’6″
Interior Length: 39’6″
Interior Width: 7′ 8″
Interior Height: 7’10”
Tare: 8,377 lbs
Max Payload: 58,800 lbs
Exterior Length: 40′
Exterior Width: 8’
Exterior Height: 9’6″
Interior Length: 39’6″
Interior Width: 7′ 8″
Interior Height: 8’10”
Tare: 8,860 lbs
Max Payload: 58,500 lbs
40ft High Cube Shipping Container Dimensions
The 40ft High Cube is the largest standard conex container size we carry — and the preferred choice for anyone who needs extra vertical clearance. At 9'6" on the exterior and 8'10" on the interior, it is one full foot taller than a standard container, making it ideal for oversized inventory, modified container offices, retail pop-ups, and any project requiring walk-in comfort.
The extra height also makes it significantly easier to install insulation, lighting, shelving, and HVAC systems inside the container — making the High Cube the go-to option for custom container builds and workspace conversions. Like all our units, it is built from CORTEN anti-corrosive steel with marine-grade plywood floors.
Frequently Asked Questions
How wide is a shipping container? All standard shipping and conex containers are 8 feet wide on the exterior (7'8" interior width). High Cube units share the same width.
How tall is a conex box? Standard height conex boxes measure 8'6" on the exterior (7'10" interior). High Cube containers are 9'6" on the exterior (8'10" interior) — one full foot taller.
How big is a conex container? The most common shipping container sizes are 20ft and 40ft in length. Use the 3D calculator below to compare capacity side by side.
Container Size & Capacity Calculator
Select a container type, then add your cargo to estimate how much fits in 3D