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Calculator: Fractional excretion of phosphate (FePO4) (conventional and SI units)

Calculator: Fractional excretion of phosphate (FePO4) (conventional and SI units)

Urine phosphate  
Serum phosphate  
Urine creatinine  
Serum creatinine  

Important: Inputs must be complete to perform calculation.

Decimal precision  


  • The fractional excretion of phosphate (FePO4) can be calculated by entering the values from simultaneously obtained urine and blood samples.
  • For this calculation, urine and serum input values may be entered as mg/dL (default) or in SI units.
  • In this calculator, mcmol is the abbreviation for micromol.

Equations used
FePO4 = (Urine phosphate / Serum phosphate) / (Urine creatinine / Serum creatinine) * 100


Only digits 0 to 9 and a single decimal point (".") are acceptable as numeric inputs. Attempted input of other characters into a numeric field may lead to an incorrect result.

Information on this page may not appear correctly if printed.

Legal Notices and Disclaimer

All information contained in and produced by the EBMcalc system is provided for educational purposes only. This information should not be used for the diagnosis or treatment of any health problem or disease. THIS INFORMATION IS NOT INTENDED TO REPLACE CLINICAL JUDGMENT OR GUIDE INDIVIDUAL PATIENT CARE IN ANY MANNER. Click here for full notice and disclaimer.

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