Estimates glomerular filtration rate (kidney function) from a blood creatinine result, using the CKD-EPI 2021 equation — the current standard recommended by the National Kidney Foundation and the American Society of Nephrology. It does not use race.
| CKD stage | eGFR range | Meaning |
|---|---|---|
| G1 | 90 or above | Normal or high |
| G2 | 60–89 | Mildly decreased |
| G3a | 45–59 | Mild to moderate decrease |
| G3b | 30–44 | Moderate to severe decrease |
| G4 | 15–29 | Severely decreased |
| G5 | Below 15 | Kidney failure range |
For adults 18 and over. eGFR is an estimate — a single result does not diagnose kidney disease, and stages G1–G2 only indicate chronic kidney disease when there are other signs of kidney damage lasting 3 months or more. Equation: Inker et al., New England Journal of Medicine, 2021 (CKD-EPI 2021 creatinine, race-free). Learn more in our kidney health guides.
What is eGFR?
eGFR (estimated glomerular filtration rate) estimates how much blood the kidneys filter each minute, adjusted for body size. It is calculated from a blood creatinine result together with age and sex, and it is the standard way kidney function is reported on lab results.
What is a normal eGFR?
In a healthy younger adult, eGFR is usually around 90–120 mL/min/1.73 m². Values naturally drift lower with age. A result below 60 that persists for three months or more is one sign of chronic kidney disease, which is why doctors repeat the test rather than acting on a single value.
Why does this calculator not ask for race?
The CKD-EPI 2021 equation was developed to estimate GFR without a race variable, and it is the version recommended by the National Kidney Foundation and the American Society of Nephrology. This calculator uses that 2021 equation.
Can a single low eGFR diagnose kidney disease?
No. Illness, dehydration, some medicines, and a large cooked-meat meal can all move creatinine temporarily. Diagnosis requires persistence over time and usually other evidence, such as albumin in the urine or imaging findings.