a. "Can you find your way to the restroom?" Level
b. "Can you talk in a general way to many people?" Level
c. "Could you teach a class in the language?" Level Could you teach a course in your specialty area in the language?
These are three simple questions, but I think people can understand these levels fairly well in regard to fluency. Where are you? What are your goals? Why do you study multiple languages? Are these levels similiar to the way you think about fluency?