Whether a person swims in a conventional 25-yard, 25-meter pool or an Olympic-sized 50-meter pool, the number of laps required to accomplish 400 metres varies. One yard equals.91440 metres, so 25 yards equals 22.860 metres.
Individuals must swim 18 full laps in a 25-yard standard pool to reach 400 metres. To swim 400 metres in a 25-meter pool, one must swim 16 laps. To accomplish 400 metres, or about a quarter mile, swimmers in Olympic-sized pools with lengths of 50 metres must swim a total of eight laps.
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