The enhancement tables below originate from the great work of
The tables show the base chance for the target enhancement level, how the chance increases per fail stack and the chance at soft cap and hard cap with the number of fail stacks needed for that in the parathesis. For more details on enhancing you can read my Black Desert Online enhancement guide.
Yellow Grade Item Enhancement Charts
Enhancement Chance of Boss Armor

Enhancement Chance of Boss Weapons

Enhancement Chance of Yellow Accessories (Boss Accessories)

Blue Grade Item Enhancement Charts
Enhancement Chance of Blue Accessories

Green Grade Item Enhancement Charts
Enhancement Chance of Green Weapons
The table shows the chance when using the durability option from +8 to +15 enhancement ranks on green weapons. For Pri and above there is no durability vs enhancement option. It’s interesting to see that the numbers are virtually the same as for boss weapons.

Enhancement Chance of Green Armor
The table shows the chance when using the durability option from +6 to +15 enhancement ranks on green armor. For Pri and above there is no durability vs enhancement option. Again it is interesting to see that the numbers are virtually the same as for boss armor.

Enhancement Chance of Green Accessories

Other Enhancement Tables
Enhancement Chance of Life Skilling Clothes (Silver embroidered clothes)

These are all the items I have for now. In time I hope to have tables for every type of enhance-able item in Black Desert Online.