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Guess the real numbers behind swimming pools, see how everyone else guessed, and get the source.
About how much water does an Olympic-size pool (50 m x 25 m, 2 m deep) hold?
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Real figures with their sources. All Pool facts →
about 309,000
The other 10.4 million or so belong to homes and individuals — and many 'public' pools sit at schools or hotels.
Source: Marketplace, citing the Association of Pool & Spa Professionals (2023) marketplace.org
more than 7 days
It's so chlorine-tolerant that it caused 89% of illnesses with a known cause in U.S. outbreaks linked to pools and other treated recreational water from 2000 to 2014.
Source: CDC, Morbidity and Mortality Weekly Report (2018) cdc.gov
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Each question asks you to guess a real number about swimming pools. After you answer you see how everyone else guessed, then the real figure and where it comes from.
Four stats and one opinion poll. A correct guess earns 100 points plus up to 50 for speed, with a combo bonus for answers in a row. The range next to the right answer earns 40. Opinion polls earn 25 for having your say, and nailing every stat adds 150.
Every stat links to its source, such as government statistics agencies, research organizations and industry groups. Figures are checked against the source before they go live.
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