eGFR Calculator
Estimate your Glomerular Filtration Rate (GFR) and check your kidney function using the CKD-EPI 2021 creatinine equation, the current gold-standard formula used by clinicians.
Calculate Your eGFR
Enter your serum creatinine level, age, and sex to estimate your Glomerular Filtration Rate and see which chronic kidney disease (CKD) stage it corresponds to.
Your Test Details
Enter the values from your blood test
eGFR Result
Estimated kidney filtration rate and CKD stage
Chronic Kidney Disease Stages
CKD stages are defined by the National Kidney Foundation (KDIGO) based on eGFR ranges, measured in mL/min/1.73m².
| Stage | eGFR Range | Description |
|---|---|---|
| G1 | 90+ | Normal kidney function* |
| G2 | 60 – 89 | Mildly decreased |
| G3a | 45 – 59 | Mildly to moderately decreased |
| G3b | 30 – 44 | Moderately to severely decreased |
| G4 | 15 – 29 | Severely decreased |
| G5 | Below 15 | Kidney failure |
eGFR & Kidney Function FAQ
Everything you need to know about interpreting your eGFR result and kidney function.
eGFR stands for estimated Glomerular Filtration Rate. It is a calculation that estimates how well your kidneys are filtering waste from your blood, based on your serum creatinine level, age, and sex, and is measured in mL/min/1.73m².
An eGFR of 90 or above is generally considered normal kidney function, provided there are no other signs of kidney damage. Values between 60 and 89 may still be normal for some people, especially as kidney function gradually declines with age.
This calculator uses the CKD-EPI 2021 creatinine equation, the race-free formula recommended by the National Kidney Foundation and American Society of Nephrology for estimating kidney function from serum creatinine, age, and sex.
CKD is generally staged as G1 (eGFR 90+, normal), G2 (60-89, mildly decreased), G3a (45-59), G3b (30-44), G4 (15-29, severely decreased), and G5 (below 15, kidney failure). Staging also depends on markers such as protein in the urine.
Some lifestyle factors, such as hydration, diet, blood pressure control, and avoiding certain medications, can influence creatinine levels. However, any change in kidney function should be discussed with a doctor, who can identify the underlying cause and appropriate management.