Science, Tech, Math › Science How Much Water Is in the Human Body? Share Flipboard Email Print The percent of water in the body is not constant. Mats Silvan, Getty Images Science Chemistry Biochemistry Basics Chemical Laws Molecules Periodic Table Projects & Experiments Scientific Method Physical Chemistry Medical Chemistry Chemistry In Everyday Life Famous Chemists Activities for Kids Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate By Anne Marie Helmenstine, Ph.D. Chemistry Expert Ph.D., Biomedical Sciences, University of Tennessee at Knoxville B.A., Physics and Mathematics, Hastings College Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels. our editorial process Facebook Facebook Twitter Twitter Anne Marie Helmenstine, Ph.D. Updated July 11, 2019 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. The human body ranges from 50% to 75% water. Infants consist of more water than adults. Overweight people contain a lower percentage of water than lean people. Men typically consist of more water than women.