Search For Articles

Path of Exile Mana Regeneration Guide

Path of Exile Mana Regeneration Guide by RulerofAsgard

The following post is an exhaustive breakdown on Mana Regeneration and why it is useful for builds that depend upon casting several spells per second – my example will be my current Hardcore character, who is a Fire Summoner Witch in Cruel Act 2.

This is my current build:


This is my intended build 2 levels from now:

Some important information about my character:

Base Mana: 511
Mana Regeneration from gear: 41%
Mana Regeneration from passives: 60%
MR from passives in 2 levels: 100%
Mana per second from Clarity: 11.9
Inner Force buff to Clarity: 30%

Fireball base casting Cost: 22
Greater Multiple Projectiles: 200%
Faster Casting: 120%

Base cast speed of Fireball: .85
Faster Casting increased cast speed: 22%
Increased cast speed from gear: 10%
Increased cast speed from passives: 10%

-----------------------------------------------------------------------------------------

The basic formula for calculating Mana Regeneration per second is this:

((Base Mana * 1.05)/60) * (1 + MR from gear + MR from passives)


With Clarity and Inner Force, it becomes a little more complex:

(((Base Mana * 1.05)/60) + (Clarity’s Mana/sec * (1 + Inner Force bonus))) * (1 + MR from gear + MR from passives)


Using the numbers I gave for my character, my Mana Regeneration per second is:

(((511 * 1.05)/60) + (11.9 * (1+.3))) * (1 + .41 + .6) = 49.069125 = ~49.1

My tooltip for Mana Regeneration per second shows 49.1, so we are good so far.


Using the numbers I provided for 2 levels from now, I get:
(((511 * 1.05)/60) + (11.9 * (1+.3))) * (1 + .41 + 1) = 58.834125 = ~58.8

So as this shows, two “20% Increased Mana Regeneration Rate” nodes equates to 9.7 higher Mana Regeneration per second – an increase of nearly 20% total regeneration in my case.

----------------------------Why is this important, you may ask?----------------------------

Take a look at Fireball. Currently, it is linked with GMP and Faster Casting. This means the cost per cast is:

22 * 2 * 1.2 = 52.8 = ~53 (tooltip shows 53)


Now we must calculate the number of casts per second, which is done thusly:

(1/Base Cast Speed) * (1 + Faster Casting bonus + Gear bonus + Passive bonus)


So for my numbers this is:

(1/.85) * (1 + .22 + .1 + .1) = 1.670588 casts per second (tooltip shows 1.67)


Using this, the total cost per second to cast Fireball is:

52.8 * 1.670588 = 88.20706 = ~88.2


My total usable Mana pool is:

Base Mana – Reserved Mana = 511 – 260 = 251


This means I can cast Fireball:

251 / 88.2 = 2.845… times WITHOUT Mana Regeneration.


With the Mana Regeneration I currently have (49.1/sec) I can cast Fireball:

251 / (88.2 – 49.1) = 6.42 times


Two levels from now, I will be able to cast Fireball:

251 / (88.2 – 58.8) = 8.54 times


This means that I can cast Fireball 2 additional times before needing to pop a Mana Flask or needing to stop casting to allow my Mana to regenerate, which equates to a 33% increase in DPS.

If you find any errors in the above, or if you have any questions, please feel free to point them out/ ask away, information is a powerful tool, so it is key to make sure what you know is accurate.

Other Related Path of Exile Articles:
PoE Class Builds
Duelist Builds
Path of Exile 2H Sweep Duelist Build
Path of Exile Dual Strike Duelist Build
Path of Exile Hardcore Race Duelist Build
Path of Exile Dual Wield Blood Rage Duelist Build
Path of Exile Duelist Bow Tank Build

Marauder Builds
Path of Exile Marauder Ground Slam Build
Path of Exile 1H Mace Hardcore Marauder Build
Path of Exile General Marauder Build Guide
Path of Exile Marauder 2H Leap Slam Build
Path of Exile Marauder 2H Axe Guide
Path of Exile Vaal Pact Marauder Build 
Path of Exile Bow Shock Marauder Build
Path of Exile Ultimate Hardcore Marauder Build

Ranger Builds
Path of Exile Elemental Bow Ranger Build
Path of Exile Dual Physical Wand Ranger Build
Path of Exile General Ranger Build
Path of Exile Physical Ranger Build
Path of Exile CI Lightning Arrow Ranger Build

Shadow Builds
Path of Exile Crit Dagger Shadow Build
Path of Exile Coldfire Crit Caster Shadow Build
Path of Exile EB Ethereal Knives Shadow Build
Path of Exile EB Ethereal Knives Shadow Build #2
Path of Exile Cold Caster Shadow Build
Path of Exile Whirling Blades Shadow Build

Templar Builds
Path of Exile CI Totem Templar Build
Path of Exile Shield Shock Block Templar Build
Path of Exile EB Frost Templar Build
Path of Exile CI Zealot's Oath Templar Build
Path of Exile Mace/Shield LS Templar Build

Witch Builds
Path of Exile Hardcore Necromancer Witch Build
Path of Exile Fire Witch Summoning Guide

General PoE Guides
Path of Exile Act 3 Walkthrough
Path of Exile Easy Merveil Runs Guide

PvP Guides
Path of Exile Cold Witch PvP Guide


No comments: