Tool to work out Partition sizes after format?

[Big.Wayne]

Hi, is there any cool little apps that can roughly work out disk space and partition sizes after they have been formatted?

I'm just at the WinXP set-up screen using a 40GB disk and its showing me

36656 (roughly 36GB)

But if I wanted to make a 20GB partition/NTFS what amount would I enter? Obviously it would be close to 20656 but by the time that has formatted it would be less than 20GB.

I always just guesstimated this but I'm sure there must be a web-page app or small program that can work this out for u (i.e what figures to enter)

Thanks in advance

 

[Big.Wayne]

Not sure if one excists to work out the size after a drives been formatted etc.

Thanks Lunix, great stuff that worked it out perfectly!