There is also Critical Vulnerability ailment, that adds a flat crit chance on top of your total crit chance
Very true, though I doubt you need to use a formula for that, since its just adding onto whatever your total crit chance is.
If you have +20% crit chance from crit vulnerability, and it is applied before calculating, you just add it to x. If its added on after, you just add 20% to whatever you get from the formula.
It’s not, sadly, though it was originally.
Critical Vulnerability adds flat crit chance per stack but this flat crit chance isn’t affected by anything else. So at max stacks it reduces the “normal” crit chance you need to 80% if you want to hit crit cap.
Should be enough, but… only with zero crit avoidance 
Crit % + CV% - CA% = resulting C% chance
where Crit % is that formula of base, added, inc and more crits from one of the previous answers
Last layer is - crit multiplayer, as it can affect crit so hard that it will be = normal dmg strike (but still proc some On crit effects)
Which Crit Vulnerability also reduces…
Crit Avoidance is multiplicative, not additive.
Hmm
(Crit % + CV%) * (100% - CA%) with no negative ?
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Yup, crit avoidance is just a multiplier at the end, after crit vulnerability
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Crit Vulnerability also reduce Crit Avoidance
Are you saying that Crit Vulnerability allows you to crit on a target with 100% crit avoidance?
Because I have never seen that occur.
https://www.lastepochtools.com/ailments/critical_vulnerability
-10% Critical Strike Avoidance per stack up to 10 stacks
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Ah, you meant like that. I thought you meant that the extra crit would ignore crit avoidance (so at 10 stacks an enemy would still be crit even with >200% CA)
Sorry if I worded it badly.
So the complete formula would then be:
( Attacker_Crit% + CV_Crit% ) * ( 100% - (Defender_CA% - CV_CA%) ) = final chance to crit
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What a twist.
So for 0% CA target with max CV stacks (10/10)
30% Attackers Crit chance is an effective cap as it will be a guaranteed crit
(30%+102%)(100%-(0%-10*10%) or 50×2=100
You would have to test it, but I’m assuming negative Crit Avoidance doesn’t work.
So at 80% Attacker Crit, you’ll guarantee crits with 10/10 Crit Vulnerability, unless the target has >100% crit avoidance.
Again, Edge cases need testing to confirm, but I recall the crit vuln change (from 5% to 2%+10% CA) was just to counter mono mods, not to just double your crit.
No. Crit chance is capped at 100%, Crit Avoidance is also effectively capped at 100% since CA is a multiplicative modifier to the final crit chance, so at 100% crit avoidance you can never be crit ever because 100% crit avoidance mutliplies the attacker’s chance to crit by 0.
The flat crit chance from crit vulnerability is not affected by your % increased/more crit multipliers but it is still affected by the defender’s crit avoidance because crit avoidance is the last term in the “has the target been crit” calculation.
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And formula is still incomplete
Some skills may multiply their crit by as More Crit
Found it in Cinder Strike (based on ignite stacks number on enemy)
Also supercrits from primordial amulet are kinda tricky, as you need 140% crit chance to fully utilize it
Or guarantee crit (example Meteor with 400+ mana node) and 40% crit chance - yes it will supercrit
More crit multipliers were mentioned in the original post.
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I guess it is my first encounter with “more crit” and right, it was mentioned in the very beginning of this post.
Cinder Strike puzzled me a lot. Crit vulnerability from ignite atop “more” and a bunch of other flat n increased with a smidgen of buffs… and at some point % is over 100 and something should be rearranged
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:Not this time 
playing marksman with Hydra Arc and found some nice combo for it, 1000 corruption maps are possible