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Ideal Total Body Water ( TBW ) Calculation

TBW calculator is used to calculate the total desired water required for the body. Enter the patient's weight, measured Na and normal Na to get the result.

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Ideal Total Body Water ( TBW ) Calculator

Patient Weight  
Measured Na (mEq/L or mmol/L)
Normal Na (mEq/L or mmol/L)
Liters =

 
   
  
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Formula:

Desired total Body Water (TBW) in L= (Measured serum Na x 0.6 x weight) / Normal serum Na

where,

Measured serum Na = Measured amount of sodium in mEq/L or mmol/L.
Normal serum na = Normal amount of sodium in mEq/L or mmol/L.

Calculation of Ideal total body water (TBW) is made easier. Free online medical calculator.