Body Water Percentage Calculator
Estimate your total body water using the validated Watson formula.
—Total body water
—% of body weight
How it's calculated
Estimates total body water using the Watson formula, a validated equation based on age, height, weight and sex, then expresses it as a percentage of body weight. Typical healthy ranges are roughly 50–65% for adults, higher in men and lower with age and higher body fat. It's an estimate, not a hydration reading. Not medical advice.