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Body water percentage is total body water divided by weight, typically 50-65% for men and 45-60% for women - the difference reflecting higher average body fat, since adipose tissue holds much less water than muscle. About 62% of body water sits inside cells and 38% outside, and that ratio is a marker of cellular health.
Water percentage
percent = total body water / body weight x 100
Compartments
intracellular about 62%, extracellular about 38% of total
These figures are population-average estimates, not a medical assessment or diagnosis. Body composition equations carry errors of several percentage points, and healthy ranges vary with age, ethnicity, muscularity and medical history. Discuss weight or body composition goals with a qualified clinician or dietitian.
Because muscle is about 75% water while fat is only about 10%, so the same total water is a larger share of a leaner body.
Only transiently. The kidneys restore balance within hours, so the percentage is set by body composition rather than intake.