As a lifelong swimmer, I've always thought of running to equal approximately 1/4 the workout of swimming, distance and time wise. A decent swimmer can swim 100 yards in about a minute at a sprint and a decent runner can sprint about 400 yards in about a minute. One mile is 1600 meters which equals 64 lengths (technically, a length is one way and a lap is down and back although most people use lap to mean just one way also) in a 25 meter pool. 400 meters swimming is 16 lengths= 1/4 miles swam which is the approximate equivalent to 1 mile run.
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The general belief is that a mile of swimming is equal to 4 to 5 miles of running. So in laps (one way) that works out to between 58 and 72 in a 25 yard pool, the common length of an indoor pool in the United States. Of course, if one is swimming butterfly or breaststroke, the most energy draining of the strokes, if done right, you could set the equivalent swim laps even lower.
It depends on the pool size
One lap is one length of the pool.
In a 25 meter pool, you need to swim about 64 laps to the mile.
In a 50 meter pool, you need to swim about 32 laps to the mile.
In a 25 yard pool you need to swim about 70 laps to the mile.
In a standard Olympic sized pool, 32 laps around would equal a mile. Or, swimming 16 lengths, or going back and forth from one end of the pool to the other.