Swimming approximately 64 lengths in a 25meter pool equals one mile. If one lap equals two lengths, approximately 32 repetitions in a pool of this size are needed to complete a mile.
One mile equals 1609.3 meters. Competitive swimmers and their coaches do not use the exact mathematical calculation to determine the number of laps necessary to reach a mile. These pros and their coaches use 1650 meters as their own benchmark, a length which actually is longer than a true mile. In swimming competitions, 1650 yards is also often called a mile, which is shorter than a true a mile.
1/3 of a mile is approximately 536.5 meters so you're looking at about 21.5 lengths.
http://wiki.answers.com/Q/How_many_laps_in_a_25_me...

There are 1069 meters in a mile, so that would mean you'd have to swim 42.76 laps to reach your goal!
http://www.kgbanswers.com/howmanylapsina25me...

You would need to do 65 laps in a 25 meter pool to swim a mile! Thanks for using ChaCha!
http://www.chacha.com/question/howmanylapsina...

OK here it goes: how many laps in a 25 meter pool would equal 500 yards? 1 meter = 1.28084 yards. 25 meters = 32.021 yards. 500 yards divided by 32.021 yards = 15.6. so about 16 laps
http://answers.yahoo.com/question/index?qid=200707...
