Dear Alexi,If you're interested, I modified http://www.cut-the-knot.org/binary.shtml to also calculate & display base 36 (we use it here for 1-byte addresses allowing up to 35 devices on a proprietary comms bus).
The attached file is only the 'form' from your page, but you may cut-and-paste it for your own purposes.
Regards,
Alf Lacis
Ai Scientific Pty Ltd
10-22 Hornibrook Esplanade
CLONTARF QLD 4019
AUSTRALIA
Ph: (+617 or 07) 3105 5087
http://www.aiscientific.com/