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GFR Calculator

Estimate kidney function (eGFR) using the CKD-EPI 2021 race-free equation. Enter age, sex, and serum creatinine to see your CKD stage.

Your details

Find this on your blood test report. Typical adult range is about 0.6 to 1.3 mg/dL.

Estimated GFR

89 mL/min/1.73m²

G2 - Mildly reduced kidney function

An eGFR of 60 to 89 is only considered chronic kidney disease if there is other evidence of kidney damage (such as protein in urine). On its own, this range is common and often not a concern.

Medical disclaimer

This calculator gives an estimate using the CKD-EPI 2021 (race-free) equation. It is not a diagnosis. A single creatinine reading can vary with hydration, diet, muscle mass, and recent exercise. Always discuss your results with your doctor, who will look at trends over time, urine albumin, and your full medical picture before making any clinical decision.

Frequently Asked Questions about the GFR Calculator

What formula does this calculator use?
The CKD-EPI 2021 race-free equation, recommended by the NIH, the National Kidney Foundation, and the American Society of Nephrology. It estimates GFR from serum creatinine, age, and sex without using a race coefficient. Result is in mL/min/1.73m².
Why was the race coefficient removed in 2021?
Earlier CKD-EPI equations applied a separate multiplier for Black patients, which led to overestimated kidney function and delayed referrals for transplant and specialist care. The 2021 update removes the race coefficient. US labs began adopting the new equation in 2021 and 2022.
How often should I recheck my eGFR?
For most healthy adults, an eGFR check during routine bloodwork (every 1 to 3 years) is fine. If you have diabetes, high blood pressure, or known kidney disease, your doctor will typically check it every 3 to 12 months depending on stage and stability.
What is a normal eGFR for my age?
GFR naturally declines with age. A typical eGFR is roughly 116 in a 30 year old, 99 at 50, and 85 at 70. An eGFR of 60 or higher without other signs of kidney damage is generally not considered chronic kidney disease.
What does my serum creatinine actually mean?
Creatinine is a waste product from normal muscle activity that healthy kidneys filter out. Higher creatinine usually means lower filtration, but it is also affected by muscle mass, diet (heavy meat intake), some medications, and recent intense exercise. eGFR adjusts for age and sex to give a more useful number.

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