Water makes up approximately 50%–70% of human body weight.

ScienceModernglobalhigh confidence

Notes on verification

Well-corroborated by multiple authoritative sources (Wikipedia, USGS, Medical News Today); range varies by age, sex, and body composition but 50-70% is a reasonable and widely cited approximation.

Sources

A Healthy Lifestyle Can Add Years to Life, Despite 'Bad' Genes (webmd.com)
https://www.medicalnewstoday.com/articles/what-percentage-of-the-human-body-is-water (medicalnewstoday.com)
https://www.usgs.gov/water-science-school/science/water-you-water-and-human-body (usgs.gov)

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