Free Water Deficit Calculator

Free calculate free water deficit in hypernatremia. This is an educational tool only - always consult a healthcare provider.

Patient Information

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Enter patient information to calculate free water deficit

About Free Water Deficit

  • • Formula: FWD = Body Weight × 0.6 × (Current Na / Target Na - 1)
  • • Correct slowly: 0.5-1 mEq/L per hour
  • • Maximum correction: 8-10 mEq/L per 24 hours
  • • Use D5W or half-normal saline