The current population of the world is 6.6 billion. The population of native English speakers in the world is around 400 million. Add in those who have learned English, and the most generous estimates of the number of total English speakers is 1.5 billion (though most estimates are much more conservative, between 500 million and 1 billion). 1.5 billion divided by 6.6 billion is 22.7%. More likely the actual figure is between 500 million (7.5%) and 1 billion (15.2%).
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The current population of the world is 6.6 billion. The population of native English speakers in the world is around 400 million. Add in those who have learned English, and the most generous estimates of the number of total English speakers is 1.5 billion (though most estimates are much more conservative, between 500 million and 1 billion). 1.5 billion divided by 6.6 billion is 22.7%. More likely the actual figure is between 500 million (7.5%) and 1 billion (15.2%).
Sources: http://books.google.com/books?id=d6jPAKxTHRYC&pg=PA68&lpg=PA68&dq=estimates+of+total+number+of+english+speakers&source=web&ots=3eC3z1Fr2t&sig=Q3W-lQCM2Gpxq2bBT-kpSSisi6w&hl=en&sa=X&oi=book_result&resnum=6&ct=result#PPA69,M1
http://www2.ignatius.edu/faculty/turner/languages.htm
http://www.ethnologue.com/show_language.asp?code=eng
LOL - Esperanto has that covered, though: http://en.lernu.net/lernado/vortoj/vortlernado/listo2.php?bildoj=0&sonoj=0&id=75&p=37
Yeah, I agree with the first comment. It's like, "Do do you plan to stop beating your wife?"