Watson Total Body Water
Watson total body water (Watson 1980): a sex-specific estimate of total body water from age, height, and weight.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Age
- 40 years
- Height
- 175 cm
- Weight
- 80 kg
- Female sex
- No
Result: Watson total body water 44.5 L (male equation).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Estimate
- Sex-specific total body water from age, height, and weight; feeds sodium and dosing calculations. An estimate, not a fluid order.
What you enter
- Age
- Height
- Weight
- Female sex
How this is calculated
Watson PE, Watson ID, Batt RD. Total body water volumes for adult males and females estimated from simple anthropometric measurements. Am J Clin Nutr. 1980;33(1):27-39. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.