Common European Framework
How do the Duolingo levels map to the Common European Framework. http://en.wikipedia.org/wiki/Common_European_Framework_of_Reference_for_Languages
I dont think that the duolingo levels could be mapped to CEFR levels. After all you could gain points and respective levels at duolingo while repeating the same lessons over and over again or while translating very easy sentences only. Having mastered the skill tree to a certain degree could however indicate very roughly a CEFR level. I am far from being through the learning so I cannot tell. But I guess that it could be something between A2 and B1?
It would be interesting to hear from duolingo or a proficient speaker on this topic to get a better sense.