A familiar situation
Review an equation-based eGFR estimate alongside clinical testing and medical interpretation.
How to use this calculator
- Enter age, serum creatinine, creatinine unit and the remaining inputs.
- Select Calculate to see the answer and its breakdown.
- Keep a scenario, change an input and compare the results.
Use consistent units and check the assumptions below before applying the result.
How gfr is calculated
2021 CKD-EPI creatinine equation: 142×min(Scr/κ,1)^α×max(Scr/κ,1)^−1.200×0.9938^age×1.012 if female; κ and α depend on sex term. For a 50-year-old man with standardized creatinine 1.0 mg/dL, the estimate is roughly 91 mL/min/1.73 m².
2021 CKD-EPI creatinine equation; eGFR=142×min(Scr/κ,1)^α×max(Scr/κ,1)^−1.200×0.9938^age×female factor.For a 50-year-old man with standardized creatinine 1.0 mg/dL, the estimate is roughly 91 mL/min/1.73 m².
Assumptions & useful context
An estimate, not a diagnosis. Kidney disease classification uses persistence and other tests such as urine albumin.
Health calculations are estimates for education. They cannot diagnose a condition or replace a clinician’s assessment. Individual needs vary, especially during pregnancy, illness and growth.
Frequently asked questions
Does one low eGFR diagnose chronic kidney disease?
No. Kidney abnormalities generally need persistence or other evidence, interpreted clinically.
Why does creatinine-based eGFR have limits?
Muscle mass, diet, acute illness, and other factors can change creatinine independently of filtration.