How do reduced mana reserved for auras and reduced mana gem scale ?

Do they add or multiply ?
In the end my question is : is it possible to have 3 auras, using 21% reduced mana reserved and a lvl 20 reduced mana gem ?
http://fogz.mine.nu:8080/poe_reserved_calc/

This will help you. Or if you dont trust the link just look for poe aura calculator on google.
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royvisser1990 wrote:
http://fogz.mine.nu:8080/poe_reserved_calc/

This will help you. Or if you dont trust the link just look for poe aura calculator on google.


Thank you dude it helped a lot !
Or without any links, do this math:

(total aura reserved) * reduced reserve on tree * reduced mana gem

Example:

Determination + Grace = 120% reserve
On tree reduced = 12% = multiplier is 100% - 12%
Reduced mana gem multiplier = 87%

120 * 0.88 * 0.87 = 91,872 = 92%


Also do note that Reduced Mana gem quality doesn't work for auras.
Life is tough... but it is tougher if you're stupid.
"
VenatorPoE wrote:
Or without any links, do this math:
(total aura reserved) * reduced reserve on tree * reduced mana gem

Not exactly.

Path of Exile always rounds down.

Reduced Mana applies directly to the Base Reserve, and rounds.
PoE calculates your reduction, rounds that, and subtracts it from the Base Reserve.
(using factors and rounding up accomplishes the same)

Additionally, don't add Reserves like that. Can screw with rounding far too easily.
As always, gear and passives are all the same - Alpha's Howl and Prism Guardian are additive with Reduced Reserve from the tree. The passive Mortal Conviction is multiplicative because it's Less, not Reduced.


Using your numbers:
60 * .87 = 52.2, round to 52
52 * 0.88 = 45.76, round to 46

Two auras, so 46 * 2 = 92% Reserved.

One level-up on Reduced Mana, though:
60 * 0.86 = 51.6, round to 51
51 * 0.88 = 44.88, round to 45
45 * 2 = 90%

Your way ends up with 120 * 0.88 * 0.86 = 90.816, round to 91%

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