Container Check Digit Calculator
Validate or compute ISO 6346 container check digits. Paste one or many container numbers (newline, comma or space separated) and click CHECK. The tool follows the international ISO 6346 algorithm.
Bulk support: newline, comma, space separated
What is a Shipping Container Check Digit?
A container number consists of 4 letters (owner+category), 6 serial digits and 1 check digit (last). The check digit is calculated per ISO 6346 by converting letters into numeric values, weighting each character by powers of two (1,2,4,8,...), summing and taking the remainder modulo 11. If the remainder is 10 many operators use 0.
This tool follows the ISO 6346 algorithm and will suggest the correct full container number when a wrong check digit is provided.