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bonus experience formula
* Higher levels of [[Monster Power]] grant increased Magic Find, Gold Find, and larger experience bonuses per monster.
** On Normal, Nightmare, and Hell each MP level adds 10% experience, for a maximum of +100%.
** On Inferno (post-[[patch 1.0.7]], which increased these bonuses) each MP grants a additional bonus experience starting at 25% increase, on MP1 and going up to +250510% on [[MP10]].* Once characters reach level 60 they generate can gain[[Nephalem Valor]] stacks which award multiply the experience gain by 15% bonus experience each. (The maximum number of stacks is five.)* When multiple players are in the same game their experience gain is multiplied by 10% for each extra player except the first one. (The bonus goes up to 30% with a full party of 4 and is additive with the Nephalem Valor stacks.)
All +percent experience gain adds up in a value shown on the character window, granting a grand total of increased experience that boosts the monster's base experience. Thus a level 60 character wearing a +25% Leoric's Signet, a Hellfire Ring on a Follower (35% / 5 = 7%), 5 stacks (75%), and playing in Inferno on MP4 (100120%) would earn a total bonus of (25 + 7 + 120) * 1.75 + 100 = 207266% experience gain.
It's not uncommon for well-equipped [[end game]] characters (Hellfire Ring + Leoric's Signet on the character and the Follower) to pull 200-300% bonus experience. More +experience isn't necessarily better, though.
After patch 1.0.7 the importance of experience enhancing items was reduced when playing on high MP settings since the MP bonus was greatly increased. The bonus from items and the one from MP are additive. Thus on MP0 (0% bonus xp) experience enhancing items are very powerful, while on MP10 (510% bonus xp) their effectiveness is reduced.
For players serious about level up speed, it's a good idea to keep a log. Record the starting time of each game, note your equipment, [[build]], and the MP level, then record the total time of the game and your ending experience. After a few trials the data should make clear which strategies are yielding the best experience over time.
==Calculating the bonus experience percentage==
Formula is as follows:
[100% (base) + bonus from MP + items] * [1 + Up to 0.75 from NV + Up to 0.30 for multiplayer + 0.25 experience shrine]
Note: base XP, MP bonus and item bonuses are all additive with each other and are multiplied by the sum between NV stacks, multiplayer bonuses and XP shrines.
Following this formula we can determine that on MP10 (510 bonus) with a full party (30% bonus) and 5 NV stacks (75% bonus) we get:
610% * 2.05 = 1250.5% (if we remove the base xp we get 1150 - the value that will be displayed in the game)
