eGFR Kidney Function Calculator
Calculate your estimated glomerular filtration rate (eGFR) using the 2021 CKD-EPI equation (race-free). Enter serum creatinine, age, and sex to stage kidney function from G1 (normal) to G5 (kidney failure). Free and private.
Key Capabilities
What is eGFR and why does it matter?
Estimated Glomerular Filtration Rate (eGFR) measures how well your kidneys filter waste from the blood. It is expressed in mL/min/1.73m² and is the primary test used to stage chronic kidney disease (CKD). A declining eGFR over time indicates worsening kidney function.
What are the CKD stages by eGFR?
G1: ≥90 — Normal or high. 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: <15 — Kidney failure.
What is the CKD-EPI 2021 equation?
CKD-EPI 2021 is the most accurate race-free equation for estimating GFR from serum creatinine in adults. It replaced earlier equations that included race as a variable. The formula uses serum creatinine, age, and sex to calculate eGFR.
What serum creatinine unit should I use?
This calculator uses mg/dL, which is the standard unit in India and the United States. If your lab report shows creatinine in μmol/L (UK/Australia), divide by 88.4 to convert to mg/dL first.
How to Use
Upload your medical document
Open the eGFR Calculator tool and upload your medical document (prescription, lab report, or medical record). Your data stays in your browser — zero server uploads.
AI analysis begins
The tool analyzes your document using specialized medical OCR models trained on healthcare documents. This typically takes 3-8 seconds.
Review extracted information
Review the structured medical information extracted from your document. Copy results or download for your records.
Frequently Asked Questions
What is eGFR and why does it matter?
Estimated Glomerular Filtration Rate (eGFR) measures how well your kidneys filter waste from the blood. It is expressed in mL/min/1.73m² and is the primary test used to stage chronic kidney disease (CKD). A declining eGFR over time indicates worsening kidney function.
What are the CKD stages by eGFR?
G1: ≥90 — Normal or high. 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: <15 — Kidney failure.
What is the CKD-EPI 2021 equation?
CKD-EPI 2021 is the most accurate race-free equation for estimating GFR from serum creatinine in adults. It replaced earlier equations that included race as a variable. The formula uses serum creatinine, age, and sex to calculate eGFR.
What serum creatinine unit should I use?
This calculator uses mg/dL, which is the standard unit in India and the United States. If your lab report shows creatinine in μmol/L (UK/Australia), divide by 88.4 to convert to mg/dL first.
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