eGFR Calculator (Kidney Function)

eGFR Calculator — Estimate Kidney Function

Estimate your kidney filtration rate (eGFR) using CKD-EPI (2021 no-race), CKD-EPI (2009) or MDRD equations. This tool is for educational use only — always review results with your clinician.

Enter your information

Age (years) Sex at birth Male Female

Serum creatinine Units mg/dL µmol/L

Equation CKD-EPI 2021 (no race) — recommended CKD-EPI 2009 (race coefficient optional) MDRD (4-variable) Race (used only for CKD-EPI 2009 or MDRD) Non-Black / Not selected Black / African heritage

Your eGFR Result

Important: eGFR is an estimate based on serum creatinine and population equations. Factors like muscle mass, diet, medication, pregnancy, and laboratory method affect results. Discuss abnormal results with your healthcare provider.

What is eGFR and how do we interpret it?

Estimated glomerular filtration rate (eGFR) is the most widely used index of kidney function. KDIGO classifies kidney function by GFR category:

• G1: ≥90 mL/min/1.73 m² — 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: <15 — kidney failure (may need dialysis/transplant).

(KDIGO GFR categories & guidance). :contentReference[oaicite:1]{index=1}

Which equation is best?

The CKD-EPI 2021 creatinine equation (no race coefficient) is now widely recommended because it removes race and improves equity while maintaining acceptable performance; it is the default here. You can also calculate eGFR with CKD-EPI 2009 (older equation that included a race coefficient) or MDRD for comparison. :contentReference[oaicite:2]{index=2}

Units & conversion

If your lab reports creatinine in µmol/L, this tool converts to mg/dL (1 mg/dL ≈ 88.4 µmol/L) before calculation. Always use your lab’s reference method when in doubt. :contentReference[oaicite:3]{index=3}

When to seek urgent care

• eGFR falls rapidly or to <30 mL/min/1.73 m² (stage G4–G5) — contact your clinician promptly.
• Symptoms such as severe shortness of breath, confusion, decreased urine output, or severe swelling — seek emergency care.

Sources

• CKD-EPI creatinine equation (2021) — National Kidney Foundation. :contentReference[oaicite:4]{index=4}
• MDRD & CKD-EPI background and equations — NKF / literature. :contentReference[oaicite:5]{index=5}
• KDIGO classification of GFR categories & CKD staging. :contentReference[oaicite:6]{index=6}
• Discussion on removing race from eGFR equations and impact. :contentReference[oaicite:7]{index=7}

Disclaimer: This calculator is educational only. It does not replace clinical judgment, lab-specific reference ranges, or personalized medical advice.