Cooldown Reduction

Cooldown Reduction (CDR) refers to the shortening of the time that a skill can be used again or chargers on a skill are available again.

Which items can have Cooldown Reductions

Attribute	Amulet	Ring	Helm	Chest	Weap 1H	Weap 2H	Off-Hand
Ranks to Frost Bolt [2 -3]
Basic Skill Damage [18.5 - 39.5%]					✔		✔
Basic Skill Damage [37 - 79%]						✔
Basic Skill Attack Speed [4.4 - 10%]			✔				✔
Frost Skill Damage [10.5 - 17.5%]	✔			✔
Damage to Chilled Enemies [7 - 14%]		✔			✔
Damage to Chilled Enemies [14 - 28%]						✔
Damage to Frozen Enemies [9.5 - 16.5%]		✔			✔
Damage to Frozen Enemies [19 - 33%]						✔
Cold Damage [10.5 - 17.5%]		✔		✔
Damage to Crowd Controlled Enemies [5 - 12%]		✔			✔
Damage to Crowd Controlled Enemies [10 - 24%]						✔
Crowd Control Duration [5 - 12%]	✔		✔				✔
Staff: Damage to Crowd Controlled Enemies [35%]						✔
Attribute	Amulet	Ring	Helm	Chest	Weap 1H	Weap 2H	Off-Hand

Helm Amulet Offhand Shield

How Cooldown Reductions are Calculated

Cooldown Reduction is multiplicative. For example

Your skill has a 30 second cooldown. You are wearing:

• Helm: 6% cooldown reduction
• Amulet: 4% cooldown reduction
• Offhand: 7% cooldown reduction

You don't just add these percentages together.

Subtract each reduction percentage from 100% (because you want to know how much is left after the reduction):

• Helm: 100% − 6% = 94%
• Amulet: 100% − 4% = 96%
• Offhand: 100% − 7% = 93%

Multiply these percentages together:

• 0.94 × 0.96 × 0.93 = 0.839904

Subtract that result from 1 to find the total reduction:

• 1 − 0.839904 = 0.160768 x 100 = 16%

So the final reduction on a 30-second cooldown is 4.8 seconds meaning your skill has a new cooldown of 25.2 seconds.