Hex 9AC3 
Decimal Equivalent 39,619 
Hex=Decimal 
Comment  Hexadecimal number to be converted  Decimal Equivalent  
0=0 1=1 2=2 3=3 4=4 5=5 6=6 7=7 8=8 9=9 A=10 B=11 C=12 D=13 E=14 F=15 
Columns are numbered from right to left, starting at column zero, not column one  column 3 
column 2 
column 1 
column 0 

Write the hex number with one digit per column  9  A  C  3  
Convert the hex digit to decimal  9  10  12  3  
Multiply each digit by 16 to the power of n, where n is the column number  9 x (16^3)  10 x (16^2)  12 x (16^1)  3 x (16^0)  
Put the answer in this row, and add all the answers together  36,864  + 2,560  + 192  + 3  = 39,619 
Hex 9AC3 
Binary Equivalent 1001 1010 1100 0011 
Hex=Binary 
Comment  Hexadecimal number to be converted  Binary Equivalent  
0=0000 1=0001 2=0010 3=0011 4=0100 5=0101 6=0110 7=0111 8=1000 9=1001 A=1010 B=1011 C=1100 D=1101 E=1110 F=1111 
Hex is directly related to binary and the order of conversion does not matter. You can start at column 3 or column zero.  column 3  column 2  column 1  column 0  
Write the hex number with one digit per column  9  A  C  3  
Convert each hex number directly into binary  1001  1010  1100  0011  
The usual use of binary is in computers where the binary digits are called bits and are grouped by 8's to make one byte (one byte = 8 bits)  1001 1010  1100 0011  1001 1010 1100 0011 