I used lichess to analyse some of my games (lichess.org -> tools -> import game). It puts my bad moves (and those of my opponent) in one of three categories; "inaccuracy", "mistake" and "blunder". I guessed from the names (and the positions) that an inaccuracy is better than a blunder, but I wondered what the definitions were.
Blunder: 300 centipawns
Mistake: 100 centipawns
Inaccuracy: 50 centipawns
This is sourced from http://en.lichess.org/qa/75/how-are-these-determined-blunder-mistake-and-inaccuracy
It is the first thing that appears when you google "lichess inaccuracy mistake blunder".
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1This information seems to be removed from their FAQ and no longer appears when googled. Thanks for adhering to good Stack Exchange standards and including the answer here opposed to just the link – nanotek Mar 1 at 20:59
