Calphin Swim Levels are a set of skill levels or standards designed to evaluate any learn-to-swim students, which were originally developed and successfully applied by Calphin Swim Academy in over one million swim lessons. These levels are also intended to be used by any amateur swimmers to reference their swim skill levels. Unless specified otherwise, below are the Passing Criteria of each level for swimmers of any gender or age. The swim times below are in reference to 50yd swims, non-stop without aid in a standard 25yd pool; FR stands for freestyle, BK for backstroke, BR for breaststroke, Fly for butterfly, “yd” for yard, and “s” for seconds