eGFR Calculator
Enter age, sex, and serum creatinine to calculate eGFR and determine your chronic kidney disease stage using the CKD-EPI 2021 equation.
Use the eGFR Calculator
Patient Details
Uses the CKD-EPI 2021 creatinine equation (race-free). For adults aged 18+. Not a substitute for professional medical advice.
Fill in the details on the left and click Calculate eGFR.
Results will appear here.
Estimated GFR
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Input Summary
- Age
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- Sex
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- Creatinine
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KDIGO CKD Staging Reference
Based on eGFR alone; full staging also incorporates albuminuria (A1–A3).
| Stage | eGFR (mL/min/1.73 m²) | Description | Typical Action |
|---|---|---|---|
| G1 | ≥90 | Normal or high | Treat risk factors; monitor annually |
| G2 | 60–89 | Mildly decreased | Monitor annually; address risk factors |
| G3a | 45–59 | Mild-to-moderate decrease | Review medications; monitor every 6 months |
| G3b | 30–44 | Moderate-to-severe decrease | Nephrology referral; dose-adjust drugs |
| G4 | 15–29 | Severely decreased | Prepare for renal replacement therapy |
| G5 | <15 | Kidney failure | Dialysis or transplantation consideration |
Summary
The eGFR (estimated Glomerular Filtration Rate) measures how well your kidneys filter waste from the blood, expressed in mL/min/1.73 m². This calculator uses the CKD-EPI 2021 creatinine equation — the current gold standard endorsed by the NKF and ASN — which removes race as a variable to provide more equitable estimates. Results are automatically mapped to KDIGO G1–G5 chronic kidney disease stages with actionable clinical context.
How it works
- Enter the patient's age in years (18 or older).
- Select biological sex (male or female) — the equation uses different coefficients for each.
- Enter the serum creatinine value; toggle between mg/dL and µmol/L as needed.
- Click Calculate eGFR to compute the result using the 2021 CKD-EPI formula.
- The tool displays your eGFR value and maps it to the matching KDIGO CKD stage with a description.
Use cases
- Assess kidney function from a routine blood test creatinine result.
- Stage chronic kidney disease (CKD) according to KDIGO G1–G5 guidelines.
- Monitor eGFR trends over time for patients with diabetes or hypertension.
- Determine whether drug dose adjustments are required based on renal function.
- Screen for early kidney disease before symptoms appear.
- Educate patients about what their lab creatinine value means in clinical terms.
- Support clinical decision-making in primary care and nephrology settings.
- Convert serum creatinine from µmol/L to an eGFR without manual math.