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B in Decimal

Hexadecimal B equals 11 in decimal.

B in all number bases

Decimal11
Hexadecimal0xB
Binary1011
Octal13

How b converts from hexadecimal to decimal

Multiply each digit by 16 raised to its position (starting at 0 from the right), then add the results:

B× 160 = 11 × 1 = 11

Sum: 11