GFR to Creatinine Clearance Calculator
The GFR to Creatinine Clearance Calculator estimates Creatinine Clearance based on eGFR and Body Surface Area. This calculator helps healthcare professionals adjust for body size when determining medication dosages. Whether you are calculating dosages for chemotherapy, antibiotics, or assessing renal function, this tool provides a quick, clinical-grade estimate.
How Creatinine Clearance Is Calculated
Creatinine Clearance (CrCl) represents the volume of blood plasma cleared of creatinine per minute. While eGFR is normalized to a standard body surface area of 1.73 m², CrCl is adjusted to the specific body size of the patient.
CrCl = (eGFR × BSA) / 1.73
Where:
- CrCl = Creatinine Clearance (mL/min)
- eGFR = Estimated Glomerular Filtration Rate (mL/min/1.73 m²)
- BSA = Body Surface Area (m²)
- 1.73 = Standard reference BSA (m²)
What Your Creatinine Clearance Means
Calculated CrCl is essential for determining appropriate medication dosages, as many drugs are excreted by the kidneys. A higher BSA typically leads to a higher absolute clearance than the normalized eGFR.
Clinical Interpretation
For Normal Renal Function: A CrCl > 90 mL/min generally indicates healthy kidney function suitable for standard drug dosing.
For Mild Impairment: If CrCl is 60-89 mL/min, caution is advised with nephrotoxic drugs, and dosages may need slight adjustment.
For Severe Impairment: A CrCl < 30 mL/min suggests significant renal failure, requiring substantial dosage reductions or avoidance of certain medications.
Pro Tip
Always use the most recent and accurate eGFR available. For elderly patients or those with unstable muscle mass, direct CrCl measurement (e.g., 24-hour urine collection) may be generally preferred over estimates.
Calculation logic verified using publicly available standards.
View our Accuracy & Reliability Framework →