Help my figure my winrate (B&M player)

I need help figuring my winrate. I know my BB/hr and I know how many hours I've played. Can someone give me an equation to help me calculate the range of my winrate? Thank you

[BritNewbie]

Is this any help?

stuff about winrates (http://forumserver.twoplustwo.com/showflat.php?Cat=&Board=inet&Number=1342415&fpart= &PHPSESSID=)

[meow_meow]

Unless you have some data that will let you get a handle on your variance, you are out of luck.