eGFR Calculator (CKD-EPI 2021)
Estimated GFR from creatinine, age and sex
Quick answer
eGFR estimates how much blood the kidneys filter per minute, in mL/min/1.73 m². This tool uses the CKD-EPI 2021 race-free equation (creatinine, age, sex). A value ≥ 90 is considered normal; below 60 for more than 3 months suggests reduced kidney function to be assessed.
| eGFR | KDIGO stage |
|---|---|
| ≥ 90 | G1 — normal |
| 60–89 | G2 — mildly reduced |
| 45–59 | G3a — mild-moderate |
| 30–44 | G3b — moderate-severe |
| 15–29 | G4 — severe |
| < 15 | G5 — kidney failure |
How it is calculated
The CKD-EPI 2021 equation (Inker et al., NEJM 2021) estimates eGFR from serum creatinine, age and sex, dropping the race coefficient used in earlier versions. Creatinine can be entered in mg/dL or µmol/L (1 mg/dL = 88.4 µmol/L). The result is expressed for a standard body surface area of 1.73 m².
How to interpret the value
A single value is not enough: chronic kidney disease is defined by an abnormality persisting for more than 3 months, also considering albuminuria. eGFR should always be read together with other tests by a doctor. Cardiometabolic factors affect kidney health: see LDL cholesterol, metabolic syndrome and the HOMA-IR index.
Disclaimer
This is a screening tool for information only to help you interpret your lab value: it is not a diagnosis. Any abnormal value should be discussed with your doctor, who considers the trend over time, albuminuria and the clinical context.
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