ELECTROLYTEFree Water DeficitPatient Education GuidePatient DataSerum SodiummEq/LPatient WeightkgPatient SexMaleFemaleCalculate DeficitWater DeficitCalculate the total free water deficit and recommended replacement rates for patients with hypernatremia.Guidelines & EvidenceWhen to UseHow it WorksClinical PearlsNext StepsThe EvidenceOrigins & HistorySection 1When to UseSection 2How it WorksSection 3Clinical PearlsSection 4Next StepsSection 5The EvidenceSection 6Origins & HistoryVerifiedLast Review: 2026When to UseLast Comprehensive Review: 2026