Free Water Deficit Calculator
Calculate free water deficit in hypernatremia and determine treatment
Free Water Deficit Results
Free Water Deficit
0
mL
Volume of free water needed
Hypernatremia Severity
Calculation Method
Free Water Deficit Formula:
FWD = TBW × [(Current Na⁺ / Target Na⁺) - 1]
Where:
• TBW = Total Body Water = 0 L
• Current Na⁺ = 0 mEq/L
• Target Na⁺ = 0 mEq/L
• FWD = 0 mL
Treatment Recommendations
Free Water Deficit Information
Mild Hypernatremia: Na⁺ 145-150 mEq/L - Usually asymptomatic
Moderate Hypernatremia: Na⁺ 150-160 mEq/L - May cause confusion, weakness
Severe Hypernatremia: Na⁺ >160 mEq/L - Can cause seizures, coma
Note: Correct hypernatremia slowly (0.5-1 mEq/L/hour) to avoid cerebral edema. Monitor closely during correction.