Convert your swimming times between Short Course Yards, Short Course Meters, and Long Course Meters. All conversions are based on the 2013 NCAA conversion tables. Strokes: 50 Freestyle. 100 Freestyle. 200 Freestyle. 400/500 Freestyle. 800/1000 Freestyle. 1500/1650 Freestyle. 100 Butterfly. 200 Butterfly. 100 Backstroke. 200 Backstroke. 100 Breaststroke. 200 Breaststroke.