How does the eGFR Calculator (CKD-EPI) work?

CKD-EPI 2021: eGFR = 142 × min(Cr/κ,1)^α × max(Cr/κ,1)^-1.200 × 0.9938^Age × 1.012 (female) Then: κ = 0.7 (female), 0.9 (male) · α = −0.241 (female), −0.302 (male) Then: Classify by eGFR into CKD stages G1–G5.

Can you give an example of how to use the eGFR Calculator (CKD-EPI)?

Example: Input Female, age 55, creatinine 1.1 mg/dL gives a result of eGFR ≈ 58 mL/min/1.73m² → G3a (mildly-moderately reduced) (Warrants nephrology referral).

Is the eGFR Calculator (CKD-EPI) free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the eGFR Calculator (CKD-EPI)?

Our eGFR Calculator (CKD-EPI) uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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eGFR Calculator (CKD-EPI)

🩺eGFR Calculator (CKD-EPI 2021)

Serum creatinine (mg/dL)

Age

eGFR (estimated Glomerular Filtration Rate) measures kidney function — how well the kidneys filter waste from blood. Calculated from serum creatinine, age, and sex using the CKD-EPI 2021 equation (replaces MDRD). Normal eGFR > 90 mL/min/1.73m².

Stage	eGFR	Description
G1	≥ 90	Normal or high
G2	60–89	Mildly reduced
G3a	45–59	Mild-moderately reduced
G3b	30–44	Moderately-severely reduced
G4	15–29	Severely reduced
G5	< 15	Kidney failure

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Did You Know?

The kidneys filter about 180 litres of blood every 24 hours, producing only 1–2 litres of urine. At eGFR < 15 (stage 5), dialysis or transplantation becomes necessary.

References

›Glomerular filtration rate — Wikipedia
›CKD-EPI equation — NIDDK

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CKD stages by eGFR

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🩺eGFR Calculator (CKD-EPI 2021)