Question about Damage Formulas

How do you add criticals into the damage formula for any skill? I assumed it would just be multiply the minimum and maximum damage the skill does by 2 to get the minimum and maximum damage with criticals but that doesn't seem to be the case according to Sybaris' Calculator. Any help is appreciated. Thanks.

+100%

+100%

Adding 100% is the same things as multiplying by 2 if I am not mistaken.

Just for a little more info here the calculator I'm using is giving me 1760 as my minimum damage using Arrow Blow without criticals and 2437 with criticals. 2437=/=1760 x 2 or 1760 + 100%. Is Sybaris' calculator wrong or am I missing something here?

It's not always the same.
Lucky Seven does 150% when maxed. 150 + 100 = 250% with critical, bit different than doubling it = 300%

It's not always the same.
Lucky Seven does 150% when maxed. 150 + 100 = 250% with critical, bit different than doubling it = 300%

Oh wow I can't believe I missed that fact. Thanks a lot, I got it working now.