CDR calculation

I recently rolled 10% cool down to each one handed weapon I was using. I had 60.3% before I rolled and after with both equipped my CDR only went to 67%. I was expecting it to go around 72%. What am I missing here?

The calculation is done against 100% - your current cooldown, not at a 100% value. So 100% minus your current cooldown (60.3%) leaves 39.7% for the reductions to be calculated against. 10% of that (first weapon) is 3.97%, making your cooldown 64.27%, and 100%- 64.27 is 35.73. 10% of that for the second weapon calculation is 3.57%, so yes, although the flat value of the weapons is 20% cooldown combined, it is only worth +/- 7% because of the additional cooldown % you already have.

If you had no other cooldown anywhere, the first weapon would give you exactly 10% cooldown. The second one would give you 9%, because it would be reducing 10% of 90%.

I though the 10% would be against how much you already have as opposed to what was left. I see now. Thanks a bunch. That was disappointing. I was trying to get up to 75 ish so I could run without zodiac for epiphany on the TR build

Itâ€™s the same thing. But it is multiplicative instead of additive. The math works out the same.

My original thought was if I add 10% to the existing 60.3 it would Get me to 66.3 then another 10 would get me up to 72 ish. Instead it multiplies by the remainder of 100 - whatever cdr you currently have. Which in this case is only a 4% gain instead of 6%. Maybe I should just roll with area damage on both weapons