Body Water Calculator
Male (Watson Formula)
Female (Watson Formula)
Formula
Male TBW = 2.447 − 0.09156×age + 0.1074×height + 0.3362×weight. Female TBW = −2.097 + 0.1069×height + 0.2466×weight.
Frequently Asked Questions
What is the Watson formula?
The Watson formula estimates total body water (TBW). For males: TBW = 2.447 − 0.09156×age + 0.1074×height(cm) + 0.3362×weight(kg). For females: TBW = −2.097 + 0.1069×height + 0.2466×weight.
Why is total body water important?
Total body water is used in clinical settings for calculating fluid replacement, drug dosing, and correcting electrolyte imbalances such as sodium disorders.
You may also need
H
Hydration Calculator
Free hydration calculator. Estimate daily water intake needs based on body weight, activity level, and climate conditions.
HealthH
Sodium Correction Calculator
Free sodium correction calculator. Calculate sodium deficit based on total body water, current sodium, and desired sodium levels.
Health