CalcBase for Windows Phone 7/8 has just been approved into the Windows Phone Store. You can download it here.
CalcBase is a simple base converter that converts any base-2 to base-16 number to all other bases from base-2 to base-16. Simply select the base you are converting from, enter your number, and then show the results to see the conversions. It’s that simple.
Here is a screen shot of the input screen:
If you have any suggestions for this app, send me some feedback.