Is there any freeware tool that can convert fractional values of various numeral systems to each other?

I have already searched Google and I am finding no tool to conver开发者_如何学运维t fractional values of various numeral system into each other.

Can anyone hive me a hand?

I need a freeware executable for WindowsXP.

WolframAlpha can do it for you, e.g. the query 7/3 in base 5 converts it.

Without a specified operating system, finding tools is just guessing we're targeting the correct OS :).