Compare Setups Link: http://compare.irowiki.org/
Example
+14 Big Crossbow
https://goo.gl/etUiNX
+15 Crimson Bow
https://goo.gl/4TC8KG
Comparing a +14 Big Crossbow to a +15 Crimson Bow
https://goo.gl/V2JxWx
Comparing a +14 Big Crossbow to a +15 Crimson Bow for Arrow Storm (+14 Big Crossbow gives 70% skill damage, you multiply the result of 1009 by 1.7 and round it down, the result is 1715).
https://goo.gl/312C5B
It shows the overall difference in damage in this case. You have to do other damage mods like skill damage, critical strike damage, ranged damage, final damage, defense modifers and additional damage yourself at this stage as the results would be difficult to do.
Edited by Nirvanna21, 19 June 2018 - 08:10 PM.