I am not sure of these numbers. I am 100% sure the listed ingredients are the cheapest to make the desired precursor, but I am not 100% on the average number of tries to get the precursor (the current estimate is from other people publishing their results - mostly from reddit's Nugkill).
Spirit Shard and Karma Items excluded (Allow SS and Karma items)
The Bard
Carcharias
Chaos Gun
The Chosen
The Colossus
Dawn + Dusk
The Energizer
Howl
The Hunter
Leaf of Kudzu
The Legend
The Lover
Rage
Rodgort's Flame
Spark
Storm
Tooth of Frostfang
Venom
Zap
Random Precursor from weapons
Random Precursor from any rare item
1 Mystic Forge Stone currently costs 16
59
15
to buy (It's only recommended to use it to take the place of an item worth more than that, or you get them for free)| Rare Ingredients | |||||
|---|---|---|---|---|---|
| Precursor | Price to MF | Ingredient 1 | Ingredient 2 | Ingredient 3 | Ingredient 4 |
 Rage Exotic Weapon Speargun 80 6.02- / day  22 073232 9791The cheapest 10 Rares used in the calculation | 4 bought Rares 235 8571(-88%) profit 781 attempts = 2,342 initial rares | Carrion Krait Harpoon Gun Rare 80, buy for 10 072.17-+ / day | Carrion Krait Harpoon Gun Rare 80, buy for 10 072.17-+ / day | Carrion Krait Harpoon Gun Rare 80, buy for 10 072.17-+ / day | Carrion Krait Harpoon Gun Rare 80, buy for 10 072.17-+ / day |
| 3 bought + 1 crafted Rares 318 4774(-91%) profit 781 attempts = 2,342 initial rares | Carrion Krait Harpoon Gun Rare 80, buy for 10 072.17-+ / day | Carrion Krait Harpoon Gun Rare 80, buy for 10 072.17-+ / day | Carrion Krait Harpoon Gun Rare 80, buy for 10 072.17-+ / day | Assassin's Godskull Harpoon Gun Rare 65, craft for 24 18Expand Recipe | |
| 2 bought + 2 crafted Rares 571 3739(-95%) profit 781 attempts = 2,342 initial rares | Carrion Krait Harpoon Gun Rare 80, buy for 10 072.17-+ / day | Carrion Krait Harpoon Gun Rare 80, buy for 10 072.17-+ / day | Assassin's Godskull Harpoon Gun Rare 65, craft for 24 18Expand Recipe | Rampager's Krait Harpoon Gun Rare 80, craft for 53 26Expand Recipe | |
| 1 bought + 3 crafted Rares 824 2704(-97%) profit 781 attempts = 2,342 initial rares | Carrion Krait Harpoon Gun Rare 80, buy for 10 072.17-+ / day | Assassin's Godskull Harpoon Gun Rare 65, craft for 24 18Expand Recipe | Rampager's Krait Harpoon Gun Rare 80, craft for 53 26Expand Recipe | Rampager's Krait Harpoon Gun Rare 80, craft for 53 26Expand Recipe | |
| 4 crafted Rares 1,077 1669(-97%) profit 781 attempts = 2,342 initial rares | Assassin's Godskull Harpoon Gun Rare 65, craft for 24 18Expand Recipe | Rampager's Krait Harpoon Gun Rare 80, craft for 53 26Expand Recipe | Rampager's Krait Harpoon Gun Rare 80, craft for 53 26Expand Recipe | Rampager's Krait Harpoon Gun Rare 80, craft for 53 26Expand Recipe | |
| Exotic Ingredients | |||||
| Precursor | Price to MF | Ingredient 1 | Ingredient 2 | Ingredient 3 | Ingredient 4 |
Rage Exotic Weapon Speargun 80 6.02- / day 22 073232 9791The cheapest 8 Exotics used in the calculation | 4 bought Exotics 139 2156(-80%) profit 139 attempts = 416 initial exotics | Carrion Legionnaire Speargun of Accuracy Exotic 78, buy for 33 451.16-+ / day | Carrion Legionnaire Speargun of Accuracy Exotic 78, buy for 33 451.16-+ / day | Carrion Legionnaire Speargun of Accuracy Exotic 78, buy for 33 451.16-+ / day | Carrion Legionnaire Speargun of Accuracy Exotic 78, buy for 33 451.16-+ / day |
| 3 bought + 1 crafted Exotics 312 8190(-91%) profit 139 attempts = 416 initial exotics | Carrion Legionnaire Speargun of Accuracy Exotic 78, buy for 33 451.16-+ / day | Carrion Legionnaire Speargun of Accuracy Exotic 78, buy for 33 451.16-+ / day | Carrion Legionnaire Speargun of Accuracy Exotic 78, buy for 33 451.16-+ / day | Rabid Pearl Speargun Exotic 80, craft for 2 0030Expand Recipe | |
| 2 bought + 2 crafted Exotics 486 4224(-94%) profit 139 attempts = 416 initial exotics | Carrion Legionnaire Speargun of Accuracy Exotic 78, buy for 33 451.16-+ / day | Carrion Legionnaire Speargun of Accuracy Exotic 78, buy for 33 451.16-+ / day | Rabid Pearl Speargun Exotic 80, craft for 2 0030Expand Recipe | Rabid Pearl Speargun Exotic 80, craft for 2 0030Expand Recipe | |
| 1 bought + 3 crafted Exotics 660 0258(-96%) profit 139 attempts = 416 initial exotics | Carrion Legionnaire Speargun of Accuracy Exotic 78, buy for 33 451.16-+ / day | Rabid Pearl Speargun Exotic 80, craft for 2 0030Expand Recipe | Rabid Pearl Speargun Exotic 80, craft for 2 0030Expand Recipe | Rabid Pearl Speargun Exotic 80, craft for 2 0030Expand Recipe | |
| 4 crafted Exotics 833 6291(-97%) profit 139 attempts = 416 initial exotics | Rabid Pearl Speargun Exotic 80, craft for 2 0030Expand Recipe | Rabid Pearl Speargun Exotic 80, craft for 2 0030Expand Recipe | Rabid Pearl Speargun Exotic 80, craft for 2 0030Expand Recipe | Rabid Pearl Speargun Exotic 80, craft for 2 0030Expand Recipe | |
Help and Info:
● Gives a list of all precursors for you to select, then tells you the cheapest ways to make the precursor you selected by throwing them into the Mystic Forge.
● The top combination will have all purchased ingredients. The second combination will have 1 crafted and 3 purchased ingredients. The third combination will have 2 crafted and 2 purchased ingredients. The fourth combination will have 3 crafted and 1 purchased ingredients. The last combination will have all crafted ingredients. You can pick which you want to use.
● 'Precursor' is which precursor is being made, and the buy order and sell listing prices for that precursor.
● 'Price to MF' is how much it costs to buy all the ingredients that will give you 1 precursor (on average). % profit is if you're selling it. The price and number of items assumes you re-MF any products of failed attempts.
● 'Ingredient 1,2,3,4' is which are the cheapest ingredients to throw into the forge and how much to buy or craft them.
● These are all averages. That means there will be times when no precursor comes out for 1000 attempts, and times when you get 2 in a row, for example. The strategy is that with a statistically significant amount of tries, you will observe the average return.
Precursor Drop Rates:
Drop rates is from research posted on reddit from the production of 289 precursors.
1 in 5 promotes rare to exotic, but appears to have less chance of getting a precursor
Average level of ingredients needs to be at least 75 to guarantee a level 80 (and thus, a precursor)
1 in 139 attempts produces a precursor from exotic (start with 416 exotics, including throwing failures back in)
1 in 781 attempts produces a precursor from rares (start with 2,342 rares, including throwing failures back in)