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A number system is a systematic way to represent numbers with symbolic characters and uses a base value to conveniently group numbers in compact form. The most common number system is decimal, which has a base value of 10, and a symbolic character set of 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9. However, there are other number systems, and they can be more efficient to use for a specific purpose. For example, because computers use Boolean logic to perform calculations and operations, they use the binary number system, which has a base value of 2.

Microsoft Office Excel has several functions that you can use to convert numbers to and from the following number systems:

 Number system Base value Symbolic character set Binary 2 0,1 Octal 8 0, 1, 2, 3, 4, 5, 6, 7 Decimal 10 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9 Hexadecimal 16 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F

To do this task, use the BIN2DEC function.

 1 2 3
 A B Formula Description (Result) =BIN2DEC(1100100) Converts binary 1100100 to decimal (100) =BIN2DEC(1111111111) Converts binary 1111111111 to decimal (-1)

To do this task, use the BIN2HEX function.

 1 2 3 4
 A B Formula Description (Result) =BIN2HEX(11111011, 4) Converts binary 11111011 to hexadecimal with 4 characters (00FB) =BIN2HEX(1110) Converts binary 1110 to hexadecimal (E) =BIN2HEX(1111111111) Converts binary 1111111111 to hexadecimal (FFFFFFFFFF)

To do this task, use the BIN2OCT function.

 1 2 3 4
 A B Formula Description (Result) =BIN2OCT(1001, 3) Converts binary 1001 to octal with 3 characters (011) =BIN2OCT(1100100) Converts binary 1100100 to octal (144) =BIN2OCT(1111111111) Converts binary 1111111111 to octal (7777777777)

To do this task, use the DEC2BIN function.

 1 2 3
 A B Formula Description (Result) =DEC2BIN(9, 4) Converts decimal 9 to binary with 4 characters (1001) =DEC2BIN(-100) Converts decimal -100 to binary (1110011100)

To do this task, use the DEC2HEX function.

 1 2 3
 A B Formula Description (Result) =DEC2HEX(100, 4) Converts decimal 100 to hexadecimal with 4 characters (0064) =DEC2HEX(-54) Converts decimal -54 to hexadecimal (FFFFFFFFCA)

To do this task, use the DEC2OCT function.

 1 2 3
 A B Formula Description (Result) =DEC2OCT(58, 3) Converts decimal 58 to octal (072) =DEC2OCT(-100) Converts decimal to octal (7777777634)

To do this task, use the HEX2BIN function.

 1 2 3 4
 A B Formula Description (Result) =HEX2BIN("F", 8) Converts hexadecimal F to binary, with 8 characters (00001111) =HEX2BIN("B7") Converts hexadecimal B7 to binary (10110111) =HEX2BIN("FFFFFFFFFF") Converts hexadecimal FFFFFFFFFF to binary (1111111111)

To do this task, use the HEX2DEC function.

 1 2 3 4
 A B Formula Description (Result) =HEX2DEC("A5") Converts hexadecimal A5 to decimal (165) =HEX2DEC("FFFFFFFF5B") Converts hexadecimal FFFFFFFF5B to decimal (-165) =HEX2DEC("3DA408B9") Converts hexadecimal 3DA408B9 to decimal (1034160313)

To do this task, use the HEX2OCT function.

 1 2 3 4
 A B Formula Description (Result) =HEX2OCT("F", 3) Converts hexadecimal F to octal with 3 characters (017) =HEX2OCT("3B4E") Converts hexadecimal 3B4E to octal (35516) =HEX2OCT("FFFFFFFF00") Converts hexadecimal FFFFFFFF00 to octal (7777777400)

To do this task, use the OCT2BIN function.

 1 2 3
 A B Formula Description (Result) =OCT2BIN(3, 3) Converts octal 3 to binary with 3 characters (011) =OCT2BIN(7777777000) Converts octal 7777777000 to binary (1000000000)

To do this task, use the OCT2DEC function.

 1 2 3
 A B Formula Description (Result) =OCT2DEC(54) Converts octal 54 to decimal (44) =OCT2DEC(7777777533) Converts octal 7777777533 to decimal (-165)

To do this task, use the OCT2HEX function.

 1 2 3
 A B Formula Description (Result) =OCT2HEX(100, 4) Converts octal number 100 to hexadecimal with 4 characters (0040) =OCT2HEX(7777777533) Converts octal number 7777777533 to hexadecimal (FFFFFFFF5B)

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