1 - Take your Weight in pounds

2 - Divide it by 3 to get the amount of water in ounces...then

3 - Divide that number by 8 to get the number of glasses.

eg - weight - 10st 4lbs = 144lbs

Divide by 3 = 48 ounces

Divide by 8 = 6 glasses per day.

* However, for a more accurate calculation go to -

http://nutrition.about.com/library/blwatercalculator.htm

http://nutrition.about.com/library/blwatercalculator.htm