# Mana surge and mastery **URL:** \ **Category:** Gameplay Chat (PC/Mobile)\ **Created:** [October 3, 2016, 2:37pm UTC](https://community.gemsofwar.com/t/mana-surge-and-mastery/13257 "2016-10-03T14:37:46Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![zann0t](https://avatars.discourse-cdn.com/v4/letter/z/8c91f0/32.png) [@zann0t](https://community.gemsofwar.com/u/zann0t)\ **Post date:** [October 3, 2016, 2:37pm UTC](https://community.gemsofwar.com/t/mana-surge-and-mastery/13257/1 "2016-10-03T14:37:46Z")
How mana surge % is calculate ? mastery point / mana surge % 282 =\> 59 % 291 =\>312 = 60 % If I try to understand : 59/282 = 0.209 So … with rounding 0.21 \* 282 = 59.22 with 291 (60% in real ) =\> 291\*0.21 = 61.11 So I don’t understand ☹ ---
**Author:** ![Lyya](https://sea1.discourse-cdn.com/flex019/user_avatar/community.gemsofwar.com/lyya/32/3650_2.png) [@Lyya](https://community.gemsofwar.com/u/Lyya)\ **Post date:** [October 3, 2016, 2:44pm UTC](https://community.gemsofwar.com/t/mana-surge-and-mastery/13257/2 "2016-10-03T14:44:31Z")
The formula (for PC/Mobile) is: CHANCE = (0.73 \* MASTERY) / (MASTERY + 62) Source: > [@Change to the Mastery math?](http://community.gemsofwar.com/t/change-to-the-mastery-math/4123): > > I read through the guide on Mana Mastery and found that the formula posted there doesn’t give me the mastery my hero page shows. My mastery is 153 for blue for example. The guide states the formula is Surge Chance = Mastery / (100+Mastery). So . . . 153 / (100+153) = 153 / 253 = 0.605 Now rounding down I get 60% but my hero page shows 51%. Has the formula been changed in some previous update? ---
**Author:** ![zann0t](https://avatars.discourse-cdn.com/v4/letter/z/8c91f0/32.png) [@zann0t](https://community.gemsofwar.com/u/zann0t)\ **Post date:** [October 3, 2016, 2:51pm UTC](https://community.gemsofwar.com/t/mana-surge-and-mastery/13257/3 "2016-10-03T14:51:18Z")
ok I try : (0.73 \*312) /(312 +62) = 0.6089 so the rouding is not fair ??? ---
**Author:** ![Amadan](https://sea1.discourse-cdn.com/flex019/user_avatar/community.gemsofwar.com/amadan/32/7653_2.png) [@Amadan](https://community.gemsofwar.com/u/Amadan)\ **Post date:** [October 4, 2016, 12:03am UTC](https://community.gemsofwar.com/t/mana-surge-and-mastery/13257/4 "2016-10-04T00:03:04Z")
I’d guess that it’s simply truncated, not rounded, for operational simplicity.