In a 25-yard swimming pool how many laps do you have to swim to constitute one mile?

A mile in a 25 yard pool equals 71 lengths or 36 laps (1,760 yards in a mile).

A mile in a 25 meter pool equals 66 lengths or 33 laps (1,650 meters in a mile).

In a 50 Meter pool, a mile is 1,650 meters, which is 33 lengths or 17 laps of the pool.

2 lengths of a pool equals 1 lap.