How to convert from octal to hexadecimal?

First convert every digit of the octal number to 3 binary digits, using this table as reference:

Then convert every 4 binary digits to a hexadecimal digit, using this table as reference:

Example:

Convert octal number 123 to hexadecimal number:

= 1 2 3

= 001 010 011

= 0101 0011

= 53₁₆

Below is the reference table for converting binary number to decimal, octal, hexadecimal, ranging from 0₁₀ to 15₁₀: