Converting binary to hex is just the reverse:

• Process the bits in groups of 4, starting from the right:

• Replace each group of 4 bits by the corresponding single hex digit

Example:

Write the binary string 10011110000111 in hex

 (1) Separate 10011110001111 into groups of 4 (starting from the right):
      
       10 0111 1000 1111

     Add leadding 0's if necessary so the leftmost group also has 4 bits

       0010 0111 1000 1111

 (2) Replace each group of 4 bits by the corresponding hex 'digit'
     and use 0x indicate this is a hex value:

     Binary: 0010 0111 1000 1111
     Hex      2     7   8    F

 Answer: 0x278F