The length has to be 50m and the width has to be 25m to be an Olympic size swimming pool. An Olympic size swimming pool also has to be at least 2m deep. So a minimum volume of 2500m³, which equates to 2,500,000 L (550,000 imp gal; 660,000 US gal).
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A true Olympic -- or world swimming competition -- pool is 50 meters, or 164 feet, long, but the width and depth can vary.
A pure competition pool might be 50m x 25m wide x 3m deep (or approximately 164ft x 82ft x 11ft). Such a pool would hold about 148,000 cubic feet, or about 1.1 million gallons.
However, non-swimmers often refer to a 25 yard "short course" pool as an 'Olympic pool'. Such community and school pools often range from 110,000 to 230,000 gallons, depending on design.
An Olympic size pool is 25 meters X 50 meters X 2 meters (minimum). Therefore, it holds 250,000 liters or 660,430.128 US gallons