Shipping Container Dimensions:
PLEASE NOTE: Dimensions may vary slightly, based on manufacturer. But these numbers should be very close.
Shipping container dimensions are held to very specific standards. The International Standard for Organization (ISO) requires that all containers are built to within a few millimeters of one another so they can be stacked on container ships without issue.
Containers are normally quantified in terms of twenty-foot equivalent units (TEU's) and are most commonly built in 20' and 40' lengths. Standard containers have an outside height of 8'6" tall, and "High Cube" containers have an outside height of 9'6".
The newest container ships are capable of handling 18,000 TEU or more. So it's extremely important that there be very little size variance from container to container. When loaded, cargo-worthy (CWO) containers are capable of stacking 7-high.