Precision
Precision is a primary character attribute. It is used to calculate the derived attribute Critical Chance, which determines the character's chance of a critical hit. At level 80, the formula relating Precision to Critical Chance is:

Critical Chance = (Precision  841.9664) / 21.0084
The displayed Critical Chance in the Hero Panel is incorrect, and generally lower than your true Critical Chance based on the above equation.
In other words, Critical Chance is 0% when Precision is 841.9664, and increases by 1% for every 21.0084 Precision above that. Since the minimum value of Precision at level 80 is 926, this means the minimum Critical Chance at level 80 is 4.0%. Only at base 926 precision is critical chance equal to the equation. As you increase precision, the hero panel will display incrementally lower critical chance as the percentage increases.
e.g. If You want to cap 100% crit chance (fury gives 20%, then You need 80%) You need to obtain 2522,6384 Precision (2522 is enough because with warrior Banner of Discipline You'll get 80%). You need to take into consideration things like: Spotter (Ranger Trait), Banner of Discipline, Signets with Precision (Warrior, Thief & Elementalist), Lightning Hammer (when wielding, it gives 180 Precision), Food, Nourisment, Traits (Major and Minor), Sigils (Accuracy & Perception, this 2nd sigil is NOT recomended) & Runes. Some enemies are on higher leveled than 80, this mean that stats are scaling down when You fighting with that opponent (e.g. Lupicus) and You need more precision to cap 100%.
At other levels, the amount of Precision required to increase Critical Chance by 1% increases as you level, in a piecewiselinear fashion  increasing by 0.1 from levels 120, 0.2 from 21 to 40, 0.3 from 41 to 60, and 0.4 from 61 to 80.
Related skills[edit]
Utility skills that increase precision[edit]
 Banner of Discipline
 Signet of Fury
 Signet of Agility
 Conjure Lightning Hammer (while wielding Lightning Hammer)
 Signet of Fire
Related traits[edit]
Trait lines that increase precision[edit]
1 trait point in the indicated trait line increases Precision by 50 points.
Traits that increase precision[edit]
 Retributive Armor (7% of toughness is given as a bonus to precision)
 Deep Strike (+40 for each unused signet equipped)
 Spotter (+150 to nearby allies)
 Blade Training (+50 while wielding a sword or a spear)
Traits that benefit from precision[edit]
 Practiced Tolerance (7% given as a bonus to vitality)
 Soothing Winds (7% given as a bonus to healing power)
Related equipment[edit]
Upgrade components that increase precision[edit]
 Sigil of Perception
 Coral Chunk, Coral Tentacle, Coral Orb
 Emerald Shard, Emerald Crystal, Emerald Orb
 Opal Shard, Opal Crystal, Opal Orb
 Ruby Shard, Ruby Crystal, Ruby Orb
 See also: list of runes that increase precision
Related consumables[edit]
Consumables that increase precision[edit]
 Bowl of Curry Butternut Squash Soup  Doubleclick to gain +100 precision, +70 Ferocity, and +10 Experience from kills. Lasts 30 minutes.
 Bowl of Curry Pumpkin Soup  Doubleclick to gain +100 precision, +70 vitality, and +10 Experience from kills. Lasts 30 minutes.
 Bowl of Fancy Potato and Leek Soup  Doubleclick to gain +100 precision, +70 condition damage, and +10 Experience from kills. Lasts 30 minutes.
 Bowl of Fire Meat Chili  Doubleclick to gain +15% burning duration, +70 precision, and +10 Experience from kills. Lasts 30 minutes.
 Bowl of Truffle Ravioli  Doubleclick to gain +100 toughness, +70 precision, and +10 Experience from kills. Lasts 30 minutes.
 Bowl of Truffle Risotto  Doubleclick to gain +100 condition damage, +70 precision, and +10 Experience from kills. Lasts 30 minutes.
 Fancy Truffle Burger  Doubleclick to gain +15% poison duration, +70 precision, and +10 Experience from kills. Lasts 30 minutes.
 Omnomberry Pie  Doubleclick to gain 66% chance to steal life on critical, +70 precision, and +10 Experience from kills. Lasts 30 minutes.
 Plate of Truffle Steak  Doubleclick to gain +100 power, +70 precision, and +10 Experience from kills. Lasts 30 minutes.
 Saffron Stuffed Mushroom  Doubleclick to gain +200 condition damage for 30 seconds when you kill a foe, +70 precision, and +10% Experience from kills. Lasts 30 minutes.
 Spicy Chocolate Cookie  Doubleclick to gain +100 healing, +70 precision, and +10 Experience from kills. Lasts 30 minutes.
 Chocolate Chip Cookie  Doubleclick to gain +50 healing, +40 precision, and +10 Experience from kills. Lasts 30 minutes.
 Bowl of Tomato Soup  Doubleclick to gain +30 precision, and +10 Experience from kills. Lasts 15 minutes.
 Bowl of Vegetable Stock  Doubleclick to gain +20 precision, and +10 Experience from kills. Lasts 15 minutes.
 Bowl of Kale Soup  Doubleclick to gain +50 precision, +40 vitality, and +10 Experience from kills. Lasts 30 minutes.
 Minotaur Steak  +60 Precision +50 Ferocity
 Toxic Maintenance Oil  +100 Precision +10% increased condition duration