Enter your Octopus card number and return the checksum value (the value within parentheses).
What is Octopus Card checksum?
The Hong Kong Octopus Card is an electronic smart card widely used on the MTR, buses, minibuses, and other public transport in Hong Kong.
The card number is a 9-10 digit number that includes a checksum digit, which ensures the accuracy of the card number.
Our service can help you calculate the checksum digit for your Octopus Card number, ensuring its validity and accuracy.