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 | Helm | Legs | Gloves | Off-Hand | Shield |
|---|---|---|---|---|---|---|
| Cooldown Reduction [4.2% - 7%] |
✔ | ✔ | ✔ | |||
| Cooldown Reduction [7%] |
✔ | |||||
| Druid: Storm Skills CDR [4.2 - 7%] |
✔ | ✔ | ||||
| Rogue: Trap Skills CDR [4.2 - 7%] |
✔ | ✔ | ||||
| Rogue: Imbuement Skills CDR [10.5 - 17.5%] |
✔ | ✔ | ||||
| Attribute | Amulet | Helm | Off-Hand | Shield |
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.