Hyponatremia—defined as a serum sodium concentration of less than 135 mEq/L—is a common and important electrolyte imbalance that can be seen in isolation or, as most often is the case, as a complication of other medical illnesses (eg, heart failure, liver failure, renal failure, pneumonia). “Hyponatremia Calculator: Sodium Correction Rate” is an app designed to help health practitioner to determine sodium correction rate for acute and chronic hyponatremia patient. “Hyponatremia Calculator: Sodi