Originally Posted by Howitzer
Do you need a solid 45% crit to have EW up 100% of the time with only 2/3 EW?
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Without 100% crit Expose Weakness will never be up 100% of the time, regardless of talent points invested.
Other than that...
Uptime = 1 - (ChanceNotToProc^Attacks)
Uptime is a value between 0 and 1, ratio of how much it's up. Uptime*100 = Uptime in percentage.
Attacks = Number of attacks you make in 7 seconds. Most likely this is not an integer, i.e. you might have 5.5 shots each 7 second cycle. If so, averaging out the uptime for 5 and 6 should be a close enough approximation.
With 3/3, ChanceNotToProc = 1-Crit%
With 2/3, ChanceNotToProc = 1-( (Crit%)*(2/3) )
With 1/3, ChanceNotToProc = 1-( (Crit%)*(1/3) )
Some superfluous parenthesis there, but it's to avoid confusion. This, along with a rough knowledge of how often you attack, should be sufficient for determining your average uptime.