Hex or hexadecimal is base 16. Valid hex characters are 0 1 2 3 4 5 6 7 8 9 A B C D E F A=10(Decimal), B=11, C=12, D=13, E=14, F=15, 10=16 The maximum value you can store in one byte is FF (255 decimal). Try our Hex to Decimal test. 
Here is a Decimal to Hex chart.

Decimal to Binary 
Binary is base 2. Valid binary characters are 0 and 1. Counting in binary looks like this: 0 = 0(decimal), 1 = 1, 10 = 2, 11 = 3, 100 = 4, 101 = 5, 110 = 6, 111 = 7, ... The value of each position for the first byte is: 128 64 32 16 8 4 2 1 The maximum value you can store in one byte is 11111111 (255 decimal). Binary Help Here is a Decimal to Binary chart. Try our Decimal to Binary test. 
Try our Binary to Decimal test. 
Here is a Binary to Hex chart. 
Octal is base 8. Valid octal characters are 0 1 2 3 4 5 6 7. Counting in octal looks like this: 0, 1, 2, 3, 4, 5, 6, 7, 10, 11, 12, 13, 14, 15, 16, 17, 20, 21, ... The maximum value you can store in one byte is 377 (255 decimal). 
Hex to Binary help 
Here is a Decimal to Octal chart. Try our Decimal to Octal test. 
Try our Octal to Decimal test. 
Decimal to Binary to Hex to Octal Chart  Very Big Number
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