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eGFR Kidney Calculator

Type the serum creatinine from your kidney function test (mg/dL), your age and sex.

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How it works

eGFR (estimated glomerular filtration rate) shows how much blood your kidneys clean every minute, in mL/min/1.73m². This calculator uses the CKD-EPI 2021 creatinine equation.

Stages: 90 or more is normal (G1), 60–89 mildly reduced (G2), 45–59 (G3a), 30–44 (G3b), 15–29 (G4) and below 15 (G5). A single low result should be repeated, and a doctor also checks urine protein before calling it kidney disease.

eGFR (Kidney Function) – FAQs

What is a normal eGFR?

An eGFR of 90 or more is normal. 60–89 can be normal in older people if there is no protein in the urine. Below 60 for 3 months or more is a sign of chronic kidney disease.

Can eGFR be wrong?

Yes. It can be off in very muscular or very thin people, after heavy exercise or a protein-rich meal, in pregnancy, and in children. Your doctor may repeat the test.

Is fasting needed for a kidney function test?

Usually no fasting is needed, but avoid heavy exercise and a very large meat meal just before the test.

This calculator is a simple guide for adults, not a diagnosis. Please talk to your doctor about your results. Not for children or pregnancy.

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