So, I was playing minecraft today, and I my diamond pick with unbreaking III was going down as normal, taking a damage every 2 blocks. I think this is a bug but not sure. So I reported it
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Related to MC-65533?
Wow, I still think this might be a bug, because I mined about 500 blocks and it was still taken normal hit points. Last snapshot/1.7 seems like it works like it should?
According to the Minecraft wiki, the formula is (100 / (Level + 1) % chance of damage. In this case, your pick will have a 25% chance of losing durability with Unbreaking III.