Critical

Base Critical = DEX Modifier*Weapon Critical Modifier
Final Critical = Base Critical+Passives+Buffs+Weapon Bonus
The Final Critical is rounded down.
If you have a Final Critical of higher than 500, it is set as 500.

buff	lvl	modifier
Angelic Icon w/Sword or Polearm	1	33
Angelic Icon w/Sword or Polearm	2	66
Angelic Icon w/Sword or Polearm	3	100
Bison Spirit Totem (60%- HP)	1	100
Bison Spirit Totem (30%- HP)	1	400
Blessing of Queen	1	(base critical*0.20)
Blessing of Queen	2	(base critical*0.25)
Blessing of Queen	3	(base critical*0.30)
Chant of Predator	1	(base critical*0.2)
Chant of Predator	2	(base critical*0.25)
Chant of Predator	3	(base critical*0.3)
Chant of Victory	1	(base critical*0.2)
Final Servitor	1	(base critical*0.2)
Focus	1	(base critical*0.2)
Focus	2	(base critical*0.25)
Focus	3	(base critical*0.3)
Focus Death	1	(base critical*-0.3)
Hawk Spirit Totem	1	100
Herb of Critical Attack	1	(base critical*0.3)
Seal of Despair	1	(base critical *-0.3)
Snipe	1-8	(base critical*0.2)
Song of Hunter	1	(base critical*1)
Tribunal	1-6	(base critical*-0.3)
Tribunal	7-9	(base critical*-0.4)
Tribunal	10	(base critical*-0.5)
Zealot (Polearm or Sword)	1	33
Zealot (Polearm or Sword)	2	66
Zealot (Polearm or Sword)	3	100

Risk Focus weapons only give the critical boost when your HP is at 60% or lower.
Weapons SAs actually add a decimal value despite what the in game description says.

type	modifier
Focus SA
Berserker Blade	73.3
Bloody Orchid	67.3
Bood Tornado	61.6
Caliburs	77.8
Caliburs*Sword of Delusion	54.0
Dark Elven Dagger	90.5
Dark Screamer	81.2
Demon Splinter	80.6
Draconic Bow	88.1
Flamberge	86.7
Forgotten Blade	84.3
Grace Dagger	81.2
Great Sword	68.9
Heavens Divider	84.3
Ice Storm Hammer	68
Infernal Master	61
Infinity Cleaver	78.7
Infinity Wings	78.7
Karik Horn	77
Katana	82.2
Katana*Sword of Nightmare	65.0
Keshanberk	68.9
Kris	71.9
Meteor Shower	61.6
Pa'agrian Sword	77
Raid Sword	82.2
Raid Sword*Samurai Longsword	43.7
Raid Sword*Sword of Nightmare	65.0
Samurai Longsword	73.3
Shamshir*Raid Sword	40.4
Shamshir*Sword of Nightmare	65.0
Spirit Sword*Raid Sword	40.4
Spirit Sword*Sword of Nightmare	65.0
Stormbringer	86.7
Stormbringer*Sword of Nightmare	76.6
Stormbringer*Spirit Sword	24.8
Sword of Damascus	64.5
Sword of Delusion	77.8
Sword of Limit*Sword of Nightmare	54.0
Sword of Nightmare	77.8
Sword of Nightmare*Sword of Nightmare	54.0
Sword of Revolution*Elven Long Sword	50.4
Tsurugi	77.8
Tsurugi*Samurai Longsword	52.6
Tsurugi*Tsurugi	54.0

Risk Focus SA
Art of Battle Axe	99.9
Battle Axe	138.7
Big Hammer	138.7
Dark Legion's Edge	130.9
Heavy War Axe	107.7
Silver Axe	138.7
Skull Graver	138.7
Star Buster	99
Yaksa Mace	115.4