eGFR Calculator
CKD-EPI 2021, without the race coefficient.
A single low value is not chronic kidney disease — that requires abnormalities persisting over three months. Creatinine also depends on muscle mass, so this misleads at extremes of build.
eGFR (mL/min/1.73m²)
86
G2 — mildly reduced
The 2021 refit removed the race coefficient earlier versions applied, which had reported higher function for Black patients and delayed referrals.
CKD stage by eGFR
| Category | eGFR (mL/min/1.73m²) |
|---|---|
| G5 — kidney failure | Below 15 |
| G4 — severely reduced | 15 – 30 |
| G3b — moderately reduced | 30 – 45 |
| G3a — mildly to moderately reduced | 45 – 60 |
| G2 — mildly reducedYou | 60 – 90 |
| G1 — normal or high | 90 and above |
How the eGFR Calculator works
eGFR estimates how much blood the kidneys filter per minute and is the basis for staging chronic kidney disease. The 2021 CKD-EPI refit removed the race coefficient that earlier versions applied, which had systematically reported higher function for Black patients and delayed referrals.
Not medical advice. This calculator gives a general estimate, not medical advice. It cannot account for your individual health, medical history, or medication. Talk to a qualified healthcare professional before acting on any result.
Frequently asked questions
Why was the race coefficient removed?
Because race is a social category, not a biological variable, and applying a multiplier to it raised reported eGFR for Black patients — delaying specialist referral and transplant listing. A National Kidney Foundation and ASN task force recommended the race-free 2021 refit, now the standard.
What are the CKD stages?
G1: 90+ with evidence of kidney damage. G2: 60-89. G3a: 45-59. G3b: 30-44. G4: 15-29. G5: under 15, kidney failure. Stages G1 and G2 require additional evidence of damage, such as albuminuria — a normal eGFR alone is not CKD.
Does one low eGFR mean kidney disease?
No. Chronic kidney disease requires abnormalities persisting over three months. A single low value can reflect dehydration, recent high protein intake, some medications, or laboratory variation. Repeat testing is what establishes a trend.
Is eGFR accurate in unusual body types?
Less so at extremes. Creatinine comes from muscle, so eGFR overestimates function in people with very low muscle mass and underestimates it in very muscular ones. Cystatin C-based equations are recommended when the creatinine estimate is likely to mislead.
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