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 433.02 +3.49
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: 433.02
Change today: +3.49
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 49 6 10 25,000 view 5 hours ago
Armadyl rune 358 160 240 25,000 view 5 hours ago
Astral rune 478 88 132 25,000 view 5 hours ago
Blood rune 651 73 110 25,000 view 5 hours ago
Body rune 29 6 9 25,000 view 5 hours ago
Chaos rune 118 56 84 25,000 view 5 hours ago
Cosmic rune 474 92 139 25,000 view 5 hours ago
Death rune 112 124 186 25,000 view 5 hours ago
Dust rune 932 8 12 25,000 view 4 hours ago
Earth rune 16 6 10 25,000 view 4 hours ago
Fire rune 89 6 10 25,000 view 4 hours ago
Lava rune 748 8 12 25,000 view 4 hours ago
Law rune 412 151 226 25,000 view 4 hours ago
Mind rune 18 6 10 25,000 view 4 hours ago
Mist rune 942 8 12 25,000 view 4 hours ago
Mud rune 883 8 12 25,000 view 4 hours ago
Nature rune 436 49 74 25,000 view 4 hours ago
Smoke rune 755 8 12 25,000 view 3 hours ago
Soul rune 513 164 246 25,000 view 3 hours ago
Steam rune 745 8 12 25,000 view 3 hours ago
Water rune 19 6 10 25,000 view 2 hours 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} $