GFR Calculator (Kidney Function)

Estimated Glomerular Filtration Rate (eGFR) measures how well your kidneys filter waste. It is the primary test for chronic kidney disease (CKD) staging.

CKD-EPI 2021 Equation (race-free):

For females (serum creatinine <= 0.7 mg/dL): eGFR = 142 x (Cr/0.7)^-0.241 x 0.9938^age

For females (serum creatinine > 0.7 mg/dL): eGFR = 142 x (Cr/0.7)^-1.200 x 0.9938^age

For males (serum creatinine <= 0.9 mg/dL): eGFR = 142 x (Cr/0.9)^-0.302 x 0.9938^age

For males (serum creatinine > 0.9 mg/dL): eGFR = 142 x (Cr/0.9)^-1.200 x 0.9938^age

CKD Stages:

• Stage 1 (GFR >= 90): Normal or high — kidney damage with normal function
• Stage 2 (GFR 60–89): Mildly decreased
• Stage 3a (GFR 45–59): Mild to moderately decreased
• Stage 3b (GFR 30–44): Moderately to severely decreased
• Stage 4 (GFR 15–29): Severely decreased
• Stage 5 (GFR < 15): Kidney failure

Normal creatinine ranges:

• Males: 0.7–1.3 mg/dL (62–115 µmol/L)
• Females: 0.6–1.1 mg/dL (53–97 µmol/L)

Important: This is for educational purposes only. Always consult a healthcare provider for medical interpretation.