Free Water Deficit Calculator

For patients with hypernatremia (elevated serum sodium)

Patient Information

Sex

Male Female

Age Range

Child Adult Elderly

Weight

kg lbs

Current Sodium Level (mEq/L)

Desired Sodium Level (mEq/L)

Free Water Deficit: -- liters

Total Body Water (TBW): -- L

Formula: Deficit = TBW × ((Na_current / Na_desired) - 1)