The Rune Index is made up of a weighted average of all of the current runes listed in the Market Watch, with the starting date of this average on 15 December 2007, at an index of 100. The overall rising and falling of rune prices is reflected in this index.
While specialised for just watching rune 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 runes added by Jagex (see the FAQ for more information).
As of today, this index is 573.23 +0.30
Historical chart
Summary
Any suggested changes to this index should be added to the talk page .
Start date: 15 December 2007 (at index of 100)
Index today: 573.23
Change today: +0.30
Number of items: 21 (last adjusted on 30 August 2014)
Index divisor : 21.2740 (last adjusted on 30 August 2014)
List of items
This is the current list of runes included in this index:
Icon
Item
Price
Direction
Low Alch
High Alch
Limit
Members
Details
Last updated
Air rune 90 6 10 25,000 view 11 days ago
Armadyl rune 326 160 240 25,000 view 11 days ago
Astral rune 415 88 132 25,000 view 11 days ago
Blood rune 678 73 110 25,000 view 11 days ago
Body rune 48 6 9 25,000 view 11 days ago
Chaos rune 152 56 84 25,000 view 11 days ago
Cosmic rune 412 92 139 25,000 view 11 days ago
Death rune 232 124 186 25,000 view 11 days ago
Dust rune 985 8 12 25,000 view 11 days ago
Earth rune 18 6 10 25,000 view 11 days ago
Fire rune 159 6 10 25,000 view 11 days ago
Lava rune 966 8 12 25,000 view 11 days ago
Law rune 570 151 226 25,000 view 11 days ago
Mind rune 19 6 10 25,000 view 11 days ago
Mist rune 1,163 8 12 25,000 view 11 days ago
Mud rune 868 8 12 25,000 view 11 days ago
Nature rune 405 49 74 25,000 view 11 days ago
Smoke rune 1,011 8 12 25,000 view 11 days ago
Soul rune 1,345 164 246 25,000 view 11 days ago
Steam rune 999 8 12 25,000 view 11 days ago
Water rune 25 6 10 25,000 view 14 days ago
Adjustments
14 October 2011
Calculations
From the old divisor obtained from the templates:
$ {div}_{\text{old}} = 14.0000 $
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{6}{11} + \frac{3}{10} + \frac{6}{15} + \dots + \frac{556}{335} \\ & = 8.93366198 \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} \\ & = 8.93366198 - 0 + 1 \\ & = 9.933661982 \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}}} \\ & = 14.0000 \times \frac{9.93366198}{8.93366198} \\ & = 15.5671 \text{ (4 d.p.)} \end{align} $
30 August 2014
Calculations
From the old divisor obtained from the templates:
$ {div}_{\text{old}} = 15.5671 $
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{19}{11} + \frac{6}{10} + \frac{26}{15} + \dots + \frac{153}{335} + \frac{389}{1,817} \\ & = 16.36670735 \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} \\ & = 16.36670735 - 0 + 6 \\ & = 22.36670735 \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}}} \\ & = 15.5671 \times \frac{22.36670735}{16.36670735} \\ & = 21.2740 \text{ (4 d.p.)} \end{align} $