Sig. Sizes and Avitar Sizes

I know yall usually limit the sizes of yalls avitars and sigs. i can make my own i would just like to know the sizes of both, prefered in pixil dimensions, TY

150x200 64kb max on avatars

sigs dont have a limit since they are hosted on third party sites and linked directly on here, but keep in mind the bigger you make your sig the longer its going to take to load etc etc.... i use 450x150 for my sigs