They're 14 in US units which corresponds to 48.8 in European units and 13.5 in UK units.
I found this information in the Wikipedia English site:
http://en.wikipedia.org/wiki/Michael_Phelps
If you mean how tall he is he is 6 ft 4"
Michael Phelps definitly MIchael Phelps
Michael Phelps' father, Fred Phelps, is reported to be around 6 feet tall. However, specific details about his height are not widely publicized, and various sources may provide slightly different information. Ultimately, the exact height may not be as significant as Michael Phelps' own achievements in swimming.
Michael Phelps is 6'4
Michael Phelps is a swimmer.
No, Michael Phelps is an American swimmer.
You don't. Michael Phelps talks to you.
Michael Phelps is not disabled...
Michael Phelps won 8 gold medals at the 2008 Beijing Olympics in swimming.Events:400m Individual Medley4x100m Freestyle relay200m Freestyle200m Butterfly4x200m Freestyle relay200m Individual Medley100m Butterfly4x100m Medley Relay
Michael Phelps has a cadillac escalade.
Michael Phelps comes from the USA.
Michael and Deborah Phelps are Michael Phelps parents. Whitney and Hilary are Michael's two sisters. Michael is 29 years old and lives in Towson, MD.