See Skills Calculator.
See Armor Calculator.
This calculator was created for creature products but it works with all npc sellable items, so keep in mind prices here is what NPCs pay for the items, also you may need to have completed quests to be able to trade with some NPCs
To use, clear your Server Log and look all your loots, paste the info here.
This one is in test phase so verify the prices and if you find any problem report it here