eGFR Calculator
Estimate your glomerular filtration rate (eGFR) from serum creatinine, age and sex with the 2021 CKD-EPI equation and see the kidney disease stage.
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About the eGFR Calculator
The estimated glomerular filtration rate (eGFR) estimates how well your kidneys filter blood. This calculator uses the 2021 CKD-EPI creatinine equation, the current race-free standard in the United States, using your age, sex and serum creatinine. It is an educational tool and does not diagnose kidney disease.
How to use it
- Enter your age and sex.
- Enter serum creatinine from a blood test and choose mg/dL or µmol/L.
- Press Calculate eGFR to see the result and kidney function stage.
CKD-EPI 2021 equation
eGFR = 142 × min(Scr/κ, 1)α × max(Scr/κ, 1)−1.200 × 0.9938age × 1.012 [if female], where κ is 0.7 for females and 0.9 for males, and α is −0.241 for females and −0.302 for males.
eGFR stages of chronic kidney disease
| Stage | eGFR (mL/min/1.73 m²) | Description |
|---|---|---|
| G1 | 90 or more | Normal or high |
| G2 | 60 to 89 | Mildly decreased |
| G3a | 45 to 59 | Mild to moderate |
| G3b | 30 to 44 | Moderate to severe |
| G4 | 15 to 29 | Severely decreased |
| G5 | Below 15 | Kidney failure |
Frequently asked questions
What is eGFR?
A calculated estimate of how many milliliters of blood your kidneys filter each minute, adjusted for body size.
What is a normal eGFR?
About 90 or higher for most adults, declining slowly with age. Below 60 for three months or more can signal chronic kidney disease.
Why does the calculator not ask for race?
The 2021 CKD-EPI equation removed race, following the recommendation of national kidney organizations.
How do I convert creatinine units?
Divide µmol/L by 88.4 to get mg/dL. The calculator does this for you.
Is this a diagnosis?
No. Talk to a doctor about your lab results and any symptoms.
Last reviewed: November 2026. Educational use only. eGFR is an estimate and not a diagnosis. Talk to your doctor.