How Much Water Is in the Human Body?

The percent of water in the body is not constant. (Getty Images)

You've probably heard that most of the human body is water, but exactly how much water is there? The average amount of water is around 65%, but the percentage of water in one person may be quite a lot different compared with how much is in another. Age, gender, and fitness are big factors in how much water is in the body... Learn more