How many ounces are in a glass of water?

A standard recommended serving size for a glass of water is 8 fluid ounces. Popular wisdom suggests drinking six to eight 8-ounce glasses of water daily, though according to WebMD the 48 to 64 ounces this yields is insufficient for some, especially when factoring activity level, body mass and climate.

The Food and Nutrition Board of the Institute of Medicine of the National Academies released a study in 2004 that set different general recommendations for men and women. Men should, according to the report, consume roughly 125 ounces of water daily on average, through food and beverages, while women should take in approximately 91 ounces.