Body Water Calculator (Watson Formula)
Watson (1980) — Male: 2.447 − 0.09156·age + 0.1074·ht + 0.3362·wt · Female: −2.097 + 0.1069·ht + 0.2466·wt
- Total body water
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- % of body weight
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- Lean body mass est.
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Estimation only — actual TBW varies with body composition and hydration status. For clinical use only as a starting estimate.
About this tool
Body Water Calculator (Watson Formula) is a single-purpose utility on instant.tw, a free toolbox of calculators, converters, generators, and quick lookups. Everything works in your browser — nothing is uploaded, nothing is stored on a server unless explicitly noted.
Category: Health — Advanced. Browse more Health — Advanced tools.