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Estimated Total Body Water Calculator — result sheet
Estimate total body water with a selected adult Watson-equation coefficient set.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Male TBW=2.447−0.09516×age+0.1074×height+0.3362×weight; female TBW=−2.097+0.1069×height+0.2466×weight.
The result is a population equation estimate in litres, not a direct measurement of hydration or a clinical fluid-management instruction.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Equation set — 2 choices
- Age in years — minimum 18; maximum 120
- Height — minimum 50; maximum 250
- Weight — minimum 1; maximum 500
Worked example
| Input | Value |
|---|---|
| Equation set | male |
| Age in years | 35 |
| Height | 175 |
| Weight | 70 |
Estimated total body water ≈41.4454 L.
Assumptions and limits
- Age, height, and weight are within the adult equation domain and use years, centimetres, and kilograms.
- The selected equation coefficients are treated as applicable to the scenario.
- Body composition, pregnancy, illness, edema, hydration status, and measurement uncertainty are not modeled.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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