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Calculate Fractional Excretion of Multiple Electrolytes

Quickly calculate fractional excretion (FE) of various electrolytes.
Serum Creatinine and Urine Creatinine are required.
Enter any electrolyte values (serum/urine) to calculate its FE.

[ Blood chemistry ]










[ Urine chemistry ]












ElectrolytePrimary Tubule LocationMeaning of Fractional Excretion (FE)
Sodium (Na⁺)Entire tubule (especially proximal tubule, distal tubule, collecting duct)Reflects overall tubular sodium reabsorption ability
Potassium (K⁺)Distal tubule, collecting duct (secretion)Assesses aldosterone function and potassium secretion
Calcium (Ca²⁺)Proximal tubule, thick ascending limb (TAL), distal tubuleEvaluates PTH function and calcium excretion
Magnesium (Mg²⁺)Thick ascending limb (TAL)Helps differentiate magnesium wasting
Phosphate (PO₄³⁻)Proximal tubuleReflects effects of PTH and FGF23 on phosphate handling
Uric Acid (UA)Proximal tubuleUsed to distinguish SIADH, AKI, and tubular function

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