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eGFR Calculator
Estimate kidney filtration and CKD stage with the 2021 CKD-EPI equation.
eGFR
—
mL/min/1.73m²
| CKD stage | — |
|---|---|
| Creatinine | — |
| Age | — |
| — |
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Enter your figures above to see the step-by-step working.
Educational estimate — not medical adviceEverything computed client-side — nothing leaves this page
How the eGFR Calculator Works
Estimated glomerular filtration rate (eGFR) gauges how well your kidneys filter, based on your serum creatinine, age and sex. This uses the 2021 CKD-EPI creatinine equation, the current race-free standard. A result of 90 or above is normal; the number falls as filtration declines. A 50-year-old man with a creatinine of 1.0 mg/dL has an eGFR around 92.
eGFR is reported per 1.73 m² of body surface area and defines the CKD stages G1 through G5. It’s an estimate — muscle mass, diet and lab methods affect creatinine — so clinicians interpret it alongside other tests. This tool is for education, not diagnosis.
eGFR = 142 × min(Scr/κ,1)α × max(Scr/κ,1)−1.2 × 0.9938age (×1.012 if female)
Frequently Asked Questions
What is a normal eGFR?
90 or above with no other signs of kidney damage is considered normal. 60–89 is mildly reduced; below 60 for three months or more suggests chronic kidney disease.
What equation does this use?
The 2021 CKD-EPI creatinine equation, which removed the race coefficient. It needs only creatinine, age and sex.
Is eGFR an exact measurement?
No — it’s an estimate from creatinine, which varies with muscle mass and diet. Doctors read it together with urine tests and history.
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