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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 141.56 Up +0.53

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: 141.56
  • Change today: Up +0.53
  • 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 avantoe1,997
Down
192810,000P2P iconview9 hours ago
Clean cadantineClean cadantine3,874
Down
263910,000P2P iconview9 hours ago
Clean dwarf weedClean dwarf weed2,816
Down
284210,000P2P iconview9 hours ago
Clean fellstalkClean fellstalk3,537
Down
609010,000P2P iconview9 hours ago
Clean guamClean guam264
Up
121810,000F2P iconview9 hours ago
Clean harralanderClean harralander123
Down
81210,000P2P iconview9 hours ago
Clean iritClean irit3,297
Up
162410,000P2P iconview9 hours ago
Clean kwuarmClean kwuarm5,100
Up
213210,000P2P iconview9 hours ago
Clean lantadymeClean lantadyme3,350
Up
274010,000P2P iconview9 hours ago
Clean marrentillClean marrentill253
Up
2310,000F2P iconview9 hours ago
Clean ranarrClean ranarr3,490
Up
101510,000P2P iconview9 hours ago
Clean snapdragonClean snapdragon3,447
Unchg
233510,000P2P iconview9 hours ago
Clean spirit weedClean spirit weed3,579
Unchg
91410,000P2P iconview9 hours ago
Clean tarrominClean tarromin48
Up
4610,000F2P iconview9 hours ago
Clean toadflaxClean toadflax5,224
Up
192810,000P2P iconview9 hours ago
Clean torstolClean torstol4,179
Up
304510,000P2P iconview9 hours ago
Clean wergaliClean wergali1,188
Unchg
172610,000P2P iconview9 hours ago
Grimy avantoeGrimy avantoe1,855
Up
0010,000P2P iconview8 hours ago
Grimy cadantineGrimy cadantine3,691
Down
0010,000P2P iconview8 hours ago
Grimy dwarf weedGrimy dwarf weed2,602
Up
0010,000P2P iconview8 hours ago
Grimy fellstalkGrimy fellstalk3,435
Unchg
406010,000P2P iconview8 hours ago
Grimy guamGrimy guam293
UpUp
121810,000F2P iconview8 hours ago
Grimy harralanderGrimy harralander80
Down
0010,000P2P iconview8 hours ago
Grimy iritGrimy irit3,106
Up
0010,000P2P iconview8 hours ago
Grimy kwuarmGrimy kwuarm4,884
Up
0010,000P2P iconview8 hours ago
Grimy lantadymeGrimy lantadyme3,109
Up
0010,000P2P iconview8 hours ago
Grimy marrentillGrimy marrentill213
UpUp
0010,000F2P iconview8 hours ago
Grimy ranarrGrimy ranarr3,320
Up
0010,000P2P iconview8 hours ago
Grimy snapdragonGrimy snapdragon3,318
Up
0010,000P2P iconview8 hours ago
Grimy spirit weedGrimy spirit weed3,650
Down
0010,000P2P iconview8 hours ago
Grimy tarrominGrimy tarromin28
Unchg
0010,000F2P iconview8 hours ago
Grimy toadflaxGrimy toadflax4,971
Down
0010,000P2P iconview8 hours ago
Grimy torstolGrimy torstol3,957
Up
0010,000P2P iconview8 hours ago
Grimy wergaliGrimy wergali1,173
Up
0010,000P2P iconview8 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}

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