Wolfram|Alpha Mathematics

Number Bases

Base Conversions

convert a decimal number to another base
219 to binary 1275 to base 7 convert 0.25 to ternary
convert a number in a given base to decimal
100011010 base 2
convert a number from one base to another
convert 324 base 6 to base 12
convert C-notation hexadecimal numbers to decimal
0xff42ca

Computations

do computations with numbers in a given base
(110110 base 2) / (11 base 2)
do mixed-base computations
(28 base 16) + (30 base 5) 675 & 0x00ff