What is a Container Check Digit?

A check digit is used to detect errors in an intermodal shipping container number. The seventh digit of the container number also known as the check digit, is calculated off of the four letters and six digits of the container number. As long as the container number follows the ISO standard, the container number can be entered into a check digit calculator to determine if it is a valid number.

For more information on ISO 6346 intermodal (shipping) containers and check digit calculations, click here.

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Check Digit Calculator

Example of a Check Digit Verification
  • MSKU2666542 [ Good ]
  • MSKU2666542 [ Good ]
  • MSKU2666542 [ Bad ]
Example of a Check Digit Calculation
  • MSKU2666542 [ 2 ]
  • MSKU2666542 [ 3 ]
  • MSKU2666542 [ 0 ]

Gulf Winds has done an exceptional job for WSS in assisting in the nationwide management of our in-house container moves. They are very pro-active and provide a top notch service. They are our premier vendor choice.

Brian Davis | Purchasing manager
Quorum international LP