Per level
| I | II | III | |
|---|---|---|---|
| Chance to lose no durability (on Armor) | 20% | 26.7% | 30% |
| Chance to lose no durability (not on Armor) | 50% | 66.7% | 75% |
Goes on
At the enchanting table
| Level | Enchanting power |
|---|---|
| Unbreaking I | 5โ55 |
| Unbreaking II | 13โ63 |
| Unbreaking III | 21โ71 |
The table can offer a level when its rolled enchanting power lands in that range. The power comes from the slot's level cost (up to 30 with 15 bookshelves), the item's enchantability and some randomness, so it is not the same as the experience cost.