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ISO container size and type code decoder
Type a 4-character code such as 22G1, 45G1 or L5G1 to see what container it is.
ISO 6346 · 4-character size and type code
Common size and type codes
| Code | Container |
|---|---|
| 20 ft dry | |
| 20 ft reefer | |
| 20 ft open top | |
| 20 ft flat rack | |
| 40 ft dry | |
| 40 ft high cube dry | |
| 40 ft high cube reefer | |
| 40 ft open top | |
| 40 ft high cube flat rack | |
| 45 ft high cube dry |
Reading a size and type code
The first character identifies the external length. The second identifies height and width. The final two characters identify the container type and its characteristics. For example, G1 means a general purpose container with passive vents in the upper part; R1 means an integral reefer that can refrigerate and heat.
A high cube is 9 ft 6 in high. Codes C, D, E and F in the second position indicate containers wider than 8 ft, such as pallet-wide equipment. Standard dimensions are external dimensions: internal space, door openings and capacity vary by manufacturer.
This decoder covers the codes in its reference table, not every special-purpose code in ISO 6346. An unknown code is not necessarily invalid. Check the standard and the markings on the actual container.
Guide: container numbers (ISO 6346)Guide: shipping container sizes
Frequently asked questions
What does 45G1 mean?
45G1 describes a 40 ft long, 9 ft 6 in high cube general purpose container with passive vents in the upper part.
What is the difference between 22G1 and 42G1?
22G1 is 20 ft long and 42G1 is 40 ft long. Both are 8 ft 6 in high, 8 ft wide general purpose containers with passive vents.
Why do some codes start with L?
L identifies a 45 ft container in the 1995 edition of ISO 6346. The 2022 edition also assigns 5 to the 45 ft length.
Where is the size and type code written on a container?
It is normally marked on the exterior of the container, commonly on the doors near the container identification number. It is a separate four-character code, not part of that number.
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