How accurate is the total body water calculation?

The calculator uses established physiological formulas based on age, height, weight, and sex, but results are estimates and cannot replace a professional medical assessment.

Can I use this calculator if I am not an adult?

The formulas are designed for adult populations; accuracy may be reduced for children or individuals outside typical age ranges.

Why does the calculator ask for sex?

The formulas differentiate between males and females because average body water percentage differs, with adult males typically around 60% and females around 50% water.

What units does the calculator use?

Height is required in centimeters and weight in kilograms; the output provides total body water in liters and as a percentage of body weight.

Medical & ClinicalFree Tool

Total Body Water Calculator

Provided byOmni Calculatoromnicalculator.com

The total body water calculator estimates the total volume of water in your body.

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Electrolytes & fluids calculators

Screenshot of Total Body Water Calculator on Omni Calculator — omnicalculator.comOpen the live tool →

About this tool

What Total Body Water Calculator does

The Total Body Water Calculator estimates the volume of water in your body using age, height, weight, and sex. It outputs the total water volume in liters, the weight equivalent, and the percentage of your total body weight, along with separate intracellular and extracellular fluid estimates. The result is based on Dr. P.E. Watson's 1980 formula, which adjusts calculations by sex to reflect typical adult body composition differences.

Step by step

How to use the Omni Calculator Total Body Water Calculator

1
Enter your sex (male or female) to select the appropriate formula
2
Input your age in years
3
Provide your height in centimeters
4
Enter your weight in kilograms
5
View the calculated total body water volume in liters and as a percentage of body weight

Is it right for you

Best for

Fitness enthusiasts, healthcare students, or anyone monitoring hydration levels who wants a quick estimate based on standard anthropometric data.

Limitations

Results are estimates and cannot replace professional medical assessment
Requires input in centimeters and kilograms; no unit switching available
Formula based on adult populations and may be less accurate for children or extreme body types

Questions

Total Body Water Calculator FAQ

How accurate is the total body water calculation?: The calculator uses established physiological formulas based on age, height, weight, and sex, but results are estimates and cannot replace a professional medical assessment.
Can I use this calculator if I am not an adult?: The formulas are designed for adult populations; accuracy may be reduced for children or individuals outside typical age ranges.
Why does the calculator ask for sex?: The formulas differentiate between males and females because average body water percentage differs, with adult males typically around 60% and females around 50% water.
What units does the calculator use?: Height is required in centimeters and weight in kilograms; the output provides total body water in liters and as a percentage of body weight.

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