GFR & Creatinine Calculator
CKD-EPI eGFR (2021)
Calculate estimated GFR using the 2021 CKD-EPI equation (race-free)
mg/dL
years
Cockcroft-Gault CrCl
Calculate creatinine clearance using the Cockcroft-Gault formula
mg/dL
years
kg
Formula
CKD-EPI 2021: eGFR = 142 × min(Scr/κ, 1)^α × max(Scr/κ, 1)^-1.200 × 0.9938^Age × (1.012 if female) | κ = 0.7 (female), 0.9 (male) | α = -0.241 (female), -0.302 (male) | Cockcroft-Gault: CrCl = [(140 - age) × weight] / (72 × SCr) × 0.85 if female
Frequently Asked Questions
What is eGFR?
eGFR (estimated glomerular filtration rate) measures how well your kidneys filter blood. Normal is 90+ mL/min/1.73m². Values below 60 for 3+ months indicate chronic kidney disease.
What is a normal creatinine level?
Normal serum creatinine is typically 0.6-1.2 mg/dL for men and 0.5-1.1 mg/dL for women. However, creatinine alone is less informative than eGFR for assessing kidney function.
What is the CKD-EPI equation?
CKD-EPI (Chronic Kidney Disease Epidemiology Collaboration) is the recommended equation for estimating GFR. The 2021 version is race-free, as recommended by NKF and ASN.
When should I be concerned about my eGFR?
eGFR below 60 that persists for 3+ months suggests chronic kidney disease. eGFR below 15 indicates kidney failure. See a nephrologist if eGFR is below 30 or declining rapidly.
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