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The Herb Index is made up of a weighted average of all of the grimy and clean herbs listed in the Market Watch, with the starting date of this average on 10 June 2009, at an index of 100. The overall rising and falling of herb prices is reflected in this index.

While specialised for just watching herb prices, it is set up and adjusted in a manner similar to the Common Trade Index, and the divisor may be adjusted to include new herbs added by Jagex (see the FAQ for more information).

As of today, this index is 137.26 Down -0.25

Historical chartEdit

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SummaryEdit

Any suggested changes to this index should be added to the talk page.

  • Start date: 10 June 2009 (at index of 100)
  • Index today: 137.26
  • Change today: Down -0.25
  • Number of items: 34 (last adjusted on 6 November 2011)
  • Index divisor: 33.2409 (last adjusted on 6 November 2011)

List of itemsEdit

This is the current list of items included in this index:

Icon Item Price Direction Low Alch High Alch Limit Members Details Last updated
Clean avantoeClean avantoe1,462
Up
192810,000P2P iconview6 hours ago
Clean cadantineClean cadantine3,239
Up
263910,000P2P iconview6 hours ago
Clean dwarf weedClean dwarf weed2,270
Down
284210,000P2P iconview6 hours ago
Clean fellstalkClean fellstalk3,977
Up
609010,000P2P iconview6 hours ago
Clean guamClean guam279
Up
121810,000F2P iconview6 hours ago
Clean harralanderClean harralander173
Down
81210,000P2P iconview6 hours ago
Clean iritClean irit3,470
Up
162410,000P2P iconview6 hours ago
Clean kwuarmClean kwuarm5,440
Up
213210,000P2P iconview6 hours ago
Clean lantadymeClean lantadyme3,235
Down
274010,000P2P iconview6 hours ago
Clean marrentillClean marrentill179
Unchg
2310,000F2P iconview6 hours ago
Clean ranarrClean ranarr2,281
Down
101510,000P2P iconview6 hours ago
Clean snapdragonClean snapdragon1,695
Unchg
233510,000P2P iconview6 hours ago
Clean spirit weedClean spirit weed4,871
Unchg
91410,000P2P iconview6 hours ago
Clean tarrominClean tarromin37
Down
4610,000F2P iconview6 hours ago
Clean toadflaxClean toadflax5,347
Up
192810,000P2P iconview6 hours ago
Clean torstolClean torstol3,944
Down
304510,000P2P iconview6 hours ago
Clean wergaliClean wergali1,135
Unchg
172610,000P2P iconview6 hours ago
Grimy avantoeGrimy avantoe1,268
Up
0010,000P2P iconview5 hours ago
Grimy cadantineGrimy cadantine3,028
Up
0010,000P2P iconview5 hours ago
Grimy dwarf weedGrimy dwarf weed2,074
Down
0010,000P2P iconview5 hours ago
Grimy fellstalkGrimy fellstalk3,853
Unchg
406010,000P2P iconview5 hours ago
Grimy guamGrimy guam279
Down
121810,000F2P iconview5 hours ago
Grimy harralanderGrimy harralander100
Down
0010,000P2P iconview5 hours ago
Grimy iritGrimy irit3,288
Down
0010,000P2P iconview5 hours ago
Grimy kwuarmGrimy kwuarm5,241
Down
0010,000P2P iconview5 hours ago
Grimy lantadymeGrimy lantadyme2,994
Down
0010,000P2P iconview5 hours ago
Grimy marrentillGrimy marrentill271
Down
0010,000F2P iconview5 hours ago
Grimy ranarrGrimy ranarr2,092
Up
0010,000P2P iconview5 hours ago
Grimy snapdragonGrimy snapdragon1,519
Down
0010,000P2P iconview5 hours ago
Grimy spirit weedGrimy spirit weed4,599
Down
0010,000P2P iconview5 hours ago
Grimy tarrominGrimy tarromin21
Unchg
0010,000F2P iconview5 hours ago
Grimy toadflaxGrimy toadflax5,159
Down
0010,000P2P iconview5 hours ago
Grimy torstolGrimy torstol3,806
Down
0010,000P2P iconview5 hours ago
Grimy wergaliGrimy wergali1,150
Unchg
0010,000P2P iconview5 hours ago


AdjustmentsEdit

6 November 2011
Item Base date Base price Price on adjustment date Comments
Grimy guam 9 June 2009 490 121 Unchanged
Grimy marrentill 192 25
Grimy tarromin 216 121
Grimy harralander 787 100
Grimy ranarr 7,654 4,032
Grimy toadflax 2,315 3,637
Grimy irit 1,552 1,172
Grimy wergali 1,800 2,450
Grimy spirit weed 1,917 2,658
Grimy avantoe 1,591 3,293
Grimy kwuarm 2,850 1,356
Grimy snapdragon 9,720 5,224
Grimy cadantine 1,234 1,186
Grimy lantadyme 1,272 5,006
Grimy dwarf weed 2,042 4,744
Grimy torstol 2,980 25,300
Clean guam 481 126
Clean marrentill 101 16
Clean tarromin 193 143
Clean harralander 791 100
Clean ranarr 7,719 3,867
Clean toadflax 2,362 3,644
Clean irit 1,795 1,232
Clean wergali 2,000 2,331
Clean spirit weed 1,888 2,725
Clean avantoe 1,593 3,253
Clean kwuarm 2,881 1,389
Clean snapdragon 9,726 5,402
Clean cadantine 1,245 1,206
Clean lantadyme 1,319 5,267
Clean dwarf weed 2,070 4,668
Clean torstol 2,762 25,400
Grimy fellstalk 1,799 Added item
Clean fellstalk 1,437

Calculations

From the old divisor obtained from the templates:

$ {div}_{\text{old}} = 32.0000 $


We need to calculate a new divisor:

$ {div}_{\text{new}} = {div}_{\text{old}} \times \frac{\sum \left ( \frac{p}{q} \right )_{\text{new}}}{\sum \left ( \frac{p}{q} \right )_{\text{old}}} $


To calculate the new divisor, we need to find:

$ \begin{align} \sum \left ( \frac{p}{q} \right )_{\text{old}} & = \text{sum of ratios prior to change} \\ & = \frac{121}{490} + \frac{25}{192} + \frac{121}{216} + \dots + \frac{25,400}{2,762} \\ & = 51.57722802 \text{ (up to 8 d.p.)} \end{align} $


And also:

$ \begin{align} \sum \left ( \frac{p}{q} \right )_{\text{new}} & = \text{sum of ratios prior to change} - \text{sum of removed ratios} + \text{sum of added ratios} \\ & = \sum \left ( \frac{p}{q} \right )_{\text{old}} - \text{sum of removed ratios} + \text{number of added items} \\ & = 51.57722802 - 0 + 2 \\ & = 53.57722802 \text{ (up to 8 d.p.)} \end{align} $


Thus, the new divisor is:

$ \begin{align} {div}_{\text{new}} & = {div}_{\text{old}} \times \frac{\sum \left ( \frac{p}{q} \right )_{\text{new}}}{\sum \left ( \frac{p}{q} \right )_{\text{old}}} \\ & = 32.0000 \times \frac{53.57722802}{51.57722802} \\ & = 33.2409 \text{ (4 d.p.)} \end{align} $