Total Body Water Calculator

Your details

The Watson and Hume-Weyers equations have separate coefficients for males and females.
Age affects the Watson estimate for males. For adults 18 and over; these equations were validated in adult populations.
years
kg
cm
Watson (1980) is the most widely validated formula for adults and is used in clinical settings for drug dosing and fluid management.
Total body waterNormal body water
43.25L

Estimated volume of water in your body

Body water percentage57.7%
Intracellular fluid (ICF)28.83L
Extracellular fluid (ECF)14.42L
Plasma volume (est.)2.88L
Interstitial fluid (est.)11.53L
57.7 %
Low<35Low-normal35-45Normal45-65High65+

Your estimated TBW is 43.3 L, close to the typical range for your sex.

  • About 28.8 L is intracellular fluid (inside your cells) and 14.4 L is extracellular fluid (plasma and interstitial fluid).
  • Typical body water percentage for adult men is around 60% of body weight; yours is 57.7%.
  • Lean tissue holds more water than fat tissue, so athletes and people with more muscle tend to have a higher body water percentage.

Next stepThis is an estimate based on external measurements. Clinical hydration status is best assessed with serum osmolality, urine specific gravity, or bioelectrical impedance analysis (BIA).

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