Edit; maybe I’m asking the wrong question.
So % elemental conversion must includes any unconverted elemental singles (fire/cold/elec) at some point.
What is the order? All single conversions first, then elemental + remaining singles after? (That seems the most logical order to me…but just guessing)
(I suppose I could determine this with some item juggling, but it would be nice and easy if someone already knew).
Let’s take Blazeseer ring ( vit > fire ) and Words of Inquisitor Abalon ( vit > Elemental)
Assume you have X vitality damage, and f% vit > fire conversion (on Blazeseer ring) and e% vit > elemental conversion (on Abalon off-hand)
Case 1, how much fire damage would you get if f% is applied before e%?
(xf + (100-f)xe/3 )/100 = (xf + xe/3 - xe*f/3)/100
Case 2, how much fire damage would you get if e% is applied before f%?
(xe/3 + (100-e/3)xf )/100 = (xe/3 + xf - xe*f/3)/100
Same amount of fire damage at the end of the day, irregardless of conversion order.
Not sure if this answers your question though.
Not really. I understand that in general the order doesn’t matter. But:
The order could be important in terms of item selections.
Say you have:
50% fire -> vit
50% cold ->acid
50% elemental ->vit
If you want to maximize the acid portion, then the order could be important. If elemental goes first, then cold-> acid will be a smaller portion. As it will the be 50% of 50% remainder or 25%.
That is why I suspect all singles go first. I’d like confirmation, though.
ah ok you meant the other way around 
I wouldn’t bet my life on it but I’m pretty sure singles go first and tri-ele gets the scraps. Easily testable by dualwielding Decree of Aldrich and Warpfire and seeing which is higher, aether or fire, on Rune of Hagarrad dmg breakdown.
I think a Crate dev once replied to my message about elemental + element conversion being bugged, and explained that we first get elemental conversion, then element (element = one single part of elemental damage, example cold).
I also might just remember it wrong.
OT: but how can we see RoH dmg breakdown?
Highly certain there is no “order” from playing numerous conversion focused builds. Conversions happen at different levels. Those types you are referencing all at the same level (item conversion), thus creating a pool which would be then balance out to 100% of damage. Elemental conversions are special in that they are essentially an abbreviation instead of listing all three elements out. IE: Decree of Aldricht gives 45% elemental to aether damage. Really this means it gives 45% cold to aether, 45% lightning to aether, 45% fire to aether. All of these values are then calculated individually and simultaneously.
Example: Check the weapon swap. Decree vs Stormbinder. https://www.grimtools.com/calc/0V0ykwXZ The same amount is converted between both items from the cold damage from lethal assault
For more complicated conversions when your total is over 100% conversion, they become weighted to equal 100%. Lets say I had a skill which I had 200% of a damage type converted to one type and another 100% converted to another type. The skills final damage would end up being 66.6% of the first damage type, and 33.3% of the second type.
It is also good to keep in mind that conversion only happens once. If damage has already been converted before it gets to the item conversion level, then it will not be effected.
Although it is interesting to note that 100% modifiers to individual skills granted by items actually function on the same level as skill modifiers granted in skill trees. IE: The 100% piercing to vitality damage conversion from Frenetic Throw skill transmutor for Phantom Blades and the 100% piercing to cold conversion from mythical speaker of the dead end up equaling 50% pierce cold and 50% pierce to vitality.
Well, I’m uncertain about the order being fixed now or maybe the character sheet doesn’t correctly show it at the time.
I did a small test with all other equipment removed.
You would figure that once these two items are in place, the numbers would be the same, not mattering in which order they are equipped.
However…the numbers vary depending on which gear is equipped first!
(Bug or feature? … ;>)
apparently there is some order of calculations in in each of those categories:
Which can have a multiplicative effect rather than the expected max. 100% weighting effect.
The only thing happening is the damage is being effected by the larger %damage increases you have for those types.
That doesn’t make sense.
When both items are in place, the % bonuses are identical. % will come after all conversion.
With all due respect, this time you’re wrong. According to what you said Magelord ringset (over 50% ele to aether) paired with Cord of Violent Decay (over 50% fire to aether) would give 100% fire to aether. It doesn’t. There’s still fire left out on Devastation and other skills. 100% tested and true. Also proved by the following experiment.
You can’t, sorry. It doesn’t show. But it does with OFF. So I decided to test it and clear things out:
aether mod - 1877%
cold mod - 135%
fire mod - 660%
OFF (414 cold) with decree and warpfire (both exactly 53% conv)
92 (68) cold, 180 (27) fire, 761 (41) aether WHEN DECREE IS EQUIPPED FIRST
92 cold, 382 (58) fire, 359 (19) aether WHEN WARPFIRE IS EQUIPPED FIRST
The conversion is dependent on the order of equipping gear (even when the skill is reset and re-bought while having the gear already equipped). Global conversion is not simultaneous. If both elemental and single element’s conversion is to a single other damage type (tested with Cord of Violent Decay, Agrivix Amulet and Magelord Rings and Decree of Aldrich) the equipping order doesn’t seem to matter.
@Ya
You should add your similar observations to this bug thread:
Incorrect total conversion on sheet display
(I have yet to get around to the game again for SS)