Free Water Deficit Calculator

Sex is required

Age Category is required

Current Sodium Level is required


Weight is required



Water Deficit = [(Age Sex Factor * Normal Weight) * (Serum Na - Desired Na)] / Desired Na

Age Sex Factor: 0.6 (male) or 0.5 (female). If elderly use, 0.5 (male) and 0.45 (female). If child use 0.6 for (male) and (female)

Using D5W, this calculation is based on a conservative correction rate of 0.5 mEq/L/h to avoid cerebral edema but the value can be changed. Patients should be carefully monitored for the rate of correction, urine output, and ongoing losses

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