Google Chrome's Omnibar or a regular Google.com search can convert numbers between different bases for you.
Here are the radices that I have found to work with Google:
[number prefix = base]
0b = binary (base 2)
0o = octal (base 8)
0x = hexadecimal (base 16)
regular number = decimal (base 10)
Here are some examples.
Binary to decimal:
Note that the binary number must be prefixed by "0b" (a zero and a lowercase b)
Hexadecimal to decimal:
Note that the hex number must be prefixed with "0x" (once again, a zero and and then a lowercase x)
Decimal to hexadecimal:
No special prefix is needed here. Just a regular number converted to hex.
Binary to hexadecimal:
Octal to decimal:
Note that the octal number must be prefixed with "0o" (a zero and and then a lowercase o)
I think you get the idea. How convenient! Thanks Google :)