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Estimates glomerular filtration rate (eGFR) using the 2021 CKD-EPI creatinine equation.
eGFR = 142 * min(creatinine / κ, 1)^α * max(creatinine / κ, 1)^-1.2 * 0.9938^age (× 1.012 if female); κ = 0.7 female / 0.9 male; α = −0.241 female / −0.302 male
≥90 mL/min/1.73 m²
Interpret results together with the patient's clinical presentation.
Specialty
Internal MedicineCategory
NephrologyDifficulty
Basic
Estimated Time
30 seconds
Version
1.0
Last Updated
2026-08-06
Formula
Keywords
Normal Range
≥90 mL/min/1.73 m²
| Classification | Range |
|---|---|
G1: Normal or high | ≥90 |
G2: Mildly decreased | 60–89 |
G3a: Mild to moderate | 45–59 |
G3b: Moderate to severe | 30–44 |
G4: Severely decreased | 15–29 |
G5: Kidney failure | <15 |
Estimates glomerular filtration rate (eGFR) using the 2021 CKD-EPI creatinine equation, which removed the race variable.
eGFR ≥90 is normal (G1). 60–89 is mildly decreased (G2). 45–59 is mild-to-moderate decrease (G3a). 30–44 is moderate-to-severe decrease (G3b). 15–29 is severely decreased (G4). <15 indicates kidney failure (G5).
eGFR is essential for CKD staging, drug dosing decisions, and monitoring kidney function over time. The 2021 CKD-EPI equation is the current standard recommended by KDIGO.
A 65-year-old woman with diabetes has a serum creatinine of 1.1 mg/dL.
Inputs:
eGFR ≈ 56 mL/min/1.73 m², which corresponds to CKD stage G3a (mild-to-moderate decrease). Repeat in 3 months to confirm chronicity.
eGFR estimates how well the kidneys are filtering waste from the blood, expressed in mL/min/1.73 m².
The 2021 equation removed race because including it was not scientifically justified and contributed to health disparities in CKD detection.
Yes. CKD-EPI is more accurate at higher GFR values and is now the preferred equation in most guidelines.
Disclaimer: This calculator is intended for educational and clinical decision support purposes only. eGFR is an estimate and should be interpreted alongside clinical context. It does not replace direct GFR measurement or clinical judgment.
Routine estimation of kidney function and CKD staging.
Not intended for medication dosing.
Drug dosing adjustment.
Less accurate for estimating true GFR.
Historical comparison.
Reduced accuracy at higher GFR.