Mercury,
Take a tape measure(like you use for measuring clothes, your mother or wife or gf or grandmother surely has one) and wrap it around the thickest part of your dick. You should get a number between 4 and 6 inches(really thick). The thickest part of mine is about 2 inches below the rim of the head. When some of these guys say "" inches wide, they're just measuring across the top. Girth is the same thing as diameter.

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My threads:
http://www.pixies-place.com:81/forums/showthread.php?s=&threadid=11911
http://www.pixies-place.com:81/forums/showthread.php?s=&threadid=11261
http://www.pixies-place.com:81/forums/showthread.php?s=&threadid=8701
http://www.pixies-place.com:81/forums/showthread.php?s=&threadid=7701
http://www.pixies-place.com:81/forums/showthread.php?s=&threadid=6321
http://www.pixies-place.com:81/forums/showthread.php?s=&threadid=6378