How many glasses of water should a person drink per day?
About 9 8-oz. glasses for women; 12.5 8-oz. glasses for men.
Women should drink about 9 8-oz. glasses while men should drink about 12.5 8-oz. glasses of water per day. This is calculated based on the 2004 Dietary References Intake Report for Water and Electrolytes published by the US Food and Nutrition Board that recommends daily total consumption of water be at about 2.7 liters for women and 3.7 liters for men, minus the about 20% of water daily that is consumed from food.