eGFR Calculator
Estimate GFR using the race-free 2021 CKD-EPI creatinine equation and see the CKD stage. Educational, not medical advice.
This uses the 2021 CKD-EPI creatinine equation, which is race-free (it no longer includes a race coefficient). It's built for adults 18 and older and assumes a stable creatinine level — it's unreliable during acute illness, in pregnancy, or at extremes of muscle mass. A single number isn't a diagnosis of kidney disease.
This is an educational estimate, not medical advice. Numbers here can't diagnose or rule out any condition. Talk to a qualified clinician about your own health.
How it works
eGFR — estimated glomerular filtration rate — is a measure of how well your kidneys filter waste from your blood. It's reported in mL/min per 1.73 m² of body surface, and it's the number clinicians lean on most to gauge kidney function and track it over time.
This tool uses the 2021 CKD-EPI creatinine equation, the version endorsed to remove the old race coefficient. It takes your age, sex, and serum creatinine (a waste product your kidneys clear) and applies different constants for men and women. Higher creatinine generally pushes the estimate down.
The result comes with a CKD stage, from G1 (normal, 90 and above) down to G5 (kidney failure, below 15). It's built for adults with stable kidney function — it's unreliable during sudden illness, in pregnancy, or for people with unusually high or low muscle mass, since muscle affects creatinine.
Frequently asked questions
What's a normal eGFR?
An eGFR of 90 or above is generally considered normal (stage G1), and 60 to 89 is mildly reduced but often still normal for older adults. Values below 60 that persist for three months or more can indicate chronic kidney disease. A clinician interprets the trend, not one reading.
Why is this version called race-free?
Earlier CKD-EPI equations included a race adjustment that raised estimates for Black patients, a practice widely criticized. The 2021 refit removes that coefficient entirely so the same equation applies to everyone, using only age, sex, and creatinine.
Can I rely on this number?
Treat it as an estimate for learning, not a diagnosis. Creatinine-based eGFR is thrown off by acute illness, pregnancy, and extremes of muscle mass, and lab methods vary. Only a clinician, often with additional tests, can properly assess your kidney health.