Mastery

Mastery is a secondary system of levels tied to individual items within a skill. Each item in a non-combat skill (with the exception of

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Alt. Magic

spells) has a level associated with it.

The bonuses unlocked by leveling Mastery depend on the specific skill the Mastery is associated with. To see a full list of bonuses for a given skill, check the in-game Mastery guide page for that skill or visit the wiki page for that skill.

Earning Mastery XP

Each time a player completes an action with an associated Mastery Level, they will receive Mastery XP for that item. The XP per action calculation is:

[math]\displaystyle{ \biggl[ \Bigl( \text{Unlocked Milestones} \times \frac{\text{Player Total Mastery for Skill}}{\text{Total Mastery for Skill}} \Bigr) + \Bigl( \text{Item Mastery Level} \times \frac{\text{Total Items in Skill}}{10} \Bigr) \biggr] \times \text{Seconds Per Action} \times 0.5 }[/math]

Where:

Unlocked Milestones is the number of milestones the player has unlocked for the relevant skill. These can be seen in game with a level number highlighted in green when viewing milestones from the skilling minibar or skills section of the completion log. This number includes "Skill Mastery" if the player is skill level 99
Player Total Mastery for Skill and Total Mastery for Skill are both numbers shown on each skill tile within the mastery section of the completion log
Item Mastery Level is the mastery level of the item/action currently being crafted/performed
Total Items in Skill is the number of items/actions within the relevant skill, and can also be expressed as [math]\displaystyle{ \tfrac{\text{Total Mastery for Skill}}{99} }[/math]
Seconds per Action for gathering skills (such as
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Woodcutting) is the number of seconds taken to complete the action. For other skills, please see below

For the following skills, Seconds per Action is replaced with the following values, being the lowest possible seconds per action after applying all available interval reduction bonuses (except for

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Firemaking

, where the value used is less than the lowest possible burn interval):

Skill	Seconds per Action
Error creating thumbnail: File missing Firemaking	60% of the log's base burn interval
Error creating thumbnail: File missing Cooking	2.55
Error creating thumbnail: File missing Smithing	1.7
Error creating thumbnail: File missing Fletching	1.5
Error creating thumbnail: File missing Crafting	1.65
Error creating thumbnail: File missing Runecrafting	1.7
Error creating thumbnail: File missing Herblore	1.7

In other words, there are two main factors that are added together to determine the XP per action:

The first is based on how many total Mastery levels the player has in the skill. Each item in a skill adds up to +1 to this factor depending on its current Mastery level.
The second is based on the Mastery level of the specific item gaining XP multiplied by one tenth of the total number of items in the skill.

After both of these factors are added together, they are multiplied by half of the time per action as measured in seconds.

There are two important takeaways from this:

Mastery XP per action increases substantially as Mastery level in an item increases.
Mastery XP is gained much more quickly for skills with a lot of items (such as
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Smithing) than it is for skills with only a few (such as
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Woodcutting).

Bonuses

Aside from increasing the factors mentioned in the formula above, there are several ways to increase the Mastery XP gained:

Name	Description
Ancient Ring of Mastery	The Ancient Ring of Mastery is a rare drop that can be found while Error creating thumbnail: File missing Fishing. It increases Mastery XP gained by 7%.
Error creating thumbnail: File missing Firemaking	Each Firemaking item at level 99 Mastery grants +0.25% Mastery XP to other skills. In addition, reaching the 95% Mastery Pool Checkpoint for Firemaking increases global Mastery XP by +5%.
Error creating thumbnail: File missing Ty	Once acquired, the Mastery pet provides a +3% Mastery XP bonus.
Mastery Pool Checkpoints	The 10% Mastery Pool checkpoint for each skill is a +5% bonus to Mastery XP gained for that skill.

The Mastery Pool

Whenever the player gains Mastery XP, 25% of the amount received is also added to the Mastery Pool for that skill. After Skill level 99, this is increased to 50% of the item Mastery XP. The maximum Mastery Pool XP for a given skill is equal to 500,000 multiplied by the total number of items in that skill.

Mastery XP Pool has two uses:

First, it can be spent to level up any item mastery for a skill. Mastery Pool XP spent this way is converted to item mastery XP at a 1:1 rate.

Second, Checkpoints are reached when the Mastery Pool reaches 10%, 25%, 50%, and 95% filled. These bonuses vary by skill, but are often quite powerful. Checkpoints only remain active as long as the Mastery Pool has enough XP in it to meet the requirement - If enough Mastery Pool XP is spent on leveling items to dip below the threshold for a given checkpoint, the bonus will be lost until enough XP is gained to reach it again.

Mastery tokens can be claimed from the bank to fill the Mastery Pool for the relevant skill by 0.1% of the maximum pool XP.

Mastery Level XP

Mastery Experience follows the same XP progression as skills do.

The experience difference between level [math]\displaystyle{ L-1 }[/math] and level [math]\displaystyle{ L }[/math] is [math]\displaystyle{ \left\lfloor \frac{1}{4} \left( L-1+300 \times 2^{\frac{L-1}{7}} \right) \right\rfloor }[/math]. The tables below show this experience difference for each level and also the cumulative experience from level 1 to level [math]\displaystyle{ L }[/math].

Level	Exp.	Exp. Diff	Level	Exp.	Exp. Diff	Level	Exp.	Exp. Diff	Level	Exp.	Exp. Diff
1	0	N/A	26	8,740	898	51	111,945	10,612	76	1,336,443	126,022
2	83	83	27	9,730	990	52	123,660	11,715	77	1,475,581	139,138
3	174	91	28	10,824	1,094	53	136,594	12,934	78	1,629,200	153,619
4	276	102	29	12,031	1,207	54	150,872	14,278	79	1,798,808	169,608
5	388	112	30	13,363	1,332	55	166,636	15,764	80	1,986,068	187,260
6	512	124	31	14,833	1,470	56	184,040	17,404	81	2,192,818	206,750
7	650	138	32	16,456	1,623	57	203,254	19,214	82	2,421,087	228,269
8	801	151	33	18,247	1,791	58	224,466	21,212	83	2,673,114	252,027
9	969	168	34	20,224	1,977	59	247,886	23,420	84	2,951,373	278,259
10	1,154	185	35	22,406	2,182	60	273,742	25,856	85	3,258,594	307,221
11	1,358	204	36	24,815	2,409	61	302,288	28,546	86	3,597,792	339,198
12	1,584	226	37	27,473	2,658	62	333,804	31,516	87	3,972,294	374,502
13	1,833	249	38	30,408	2,935	63	368,599	34,795	88	4,385,776	413,482
14	2,107	274	39	33,648	3,240	64	407,015	38,416	89	4,842,295	456,519
15	2,411	304	40	37,224	3,576	65	449,428	42,413	90	5,346,332	504,037
16	2,746	335	41	41,171	3,947	66	496,254	46,826	91	5,902,831	556,499
17	3,115	369	42	45,529	4,358	67	547,953	51,699	92	6,517,253	614,422
18	3,523	408	43	50,339	4,810	68	605,032	57,079	93	7,195,629	678,376
19	3,973	450	44	55,649	5,310	69	668,051	63,019	94	7,944,614	748,985
20	4,470	497	45	61,512	5,863	70	737,627	69,576	95	8,771,558	826,944
21	5,018	548	46	67,983	6,471	71	814,445	76,818	96	9,684,577	913,019
22	5,624	606	47	75,127	7,144	72	899,257	84,812	97	10,692,629	1,008,052
23	6,291	667	48	83,014	7,887	73	992,895	93,638	98	11,805,606	1,112,977
24	7,028	737	49	91,721	8,707	74	1,096,278	103,383	99	13,034,431	1,228,825
25	7,842	814	50	101,333	9,612	75	1,210,421	114,143

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Earning Mastery XP

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The Mastery Pool

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