Urine Phosphate Calculator

Traditional management of stage III-V chronic kidney disease (CKD) includes dietary phosphate restriction and/or the use of phosphorus binders. Monitoring dietary phosphorus is important for assessing patient compliance and the effectiveness of therapeutic interventions. The 24-hour urine collection is the gold standard method for measuring dietary phosphorus; however, this procedure is cumbersome and prone to timing errors. Use this calculator to estimate 24-hour urine phosphorus concentration based on spot urine phosphorus concentration, spot urine creatinine, age, gender and body weight.

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The estimated 24-hour urine phosphorus is 642.5 mg/day