Cleave Books The Number Base Calculator

 
base 2 [0,1]   base 10 [0,1,2,3,4,5,6,7,8,9] 
base 3 [0,1,2]   base 11 [0 to 9, A] 
base 4 [0,1,2,3]   base 12 [0 to 9, A,B] 
base 5 [0,1,2,3,4]   base 13 [0 to 9, A,B,C] 
base 6 [0,1,2,3,4,5]   base 14 [0 to 9, A,B,C,D] 
base 7 [0,1,2,3,4,5,6]   base 15 [0 to 9, A,B,C,D,E] 
base 8 [0,1,2,3,4,5,6,7]   base 16 [0 to 9, A,B,C,D,E,F] 
base 9 [0,1,2,3,4,5,6,7,8]   base 20 [0 to 9, A,B,C,D,E,F,G,H,J,K] 
Restrictions Entries limited to equivalent of 10 million. Only characters indicated on the right may be used. A = 10 B = 11 C = 12 D = 13 E = 14 F = 15 G = 16 H = 17 J = 18 K = 19 
Additional Information This calculator is concerned only with changing numbers into different bases and no attempt is made to explain what these numbers are and how they work. Take care that numbers in any base, other than 10, are said by naming the separate digits. Only in the base 10 (decimal) system can words such "hundred", "thousand", "million" and so on, be used. Thus '10022' in base 3 would be said as "One, zero, zero, two, two" and NOT "Ten thousand and twenty two". (It is "Eighty nine".)
Note in this calculator, for clarity   the numbers have been spaced in groups of four as distinct from the more usual groups of three. However, in some browsers, this space may not appear.  in the sequence of letters used, the I (eye) has been left out. This is to avoid confusion with the numeral 1  input of letters is accepted in either capital or lower case form (A or a) but output is always given with capitals. 

Alternative names for some of the numbers are base 2 = binary base 3 = ternary base 8 = octal base 10 = denary or decimal base 12 = duodecimal base 16 = hexadecimal The symbol & (called an ampersand) is sometimes placed in front of a number to show that it is a hexadecimal number. Thus &B23F7 becomes 730103 in its decimal form. Note that Web pages use hexadecimal numbers in their coding to indicate colours. For instance, the pale green background colour of this page is signalled as #AAFFDD However, this is not a complete hexadecimal number (which would be 11,206,621 decimal). Instead it must be read as three separate hexadecimal numbers. In this case AA;FF;DD and that gives the three values 170;255;221 These three values show the proportions of red, green and blue respectively, that have to be mixed to give the final pale green colour. 
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