eGFR Calculator – CKD-EPI 2021

Calculate estimated GFR using the CKD-EPI 2021 creatinine equation. Assess kidney function stage.

Serum creatinine (mg/dL) (mg/dL)

Age (years) (years)

Sex

Race (Black = 1, Other = 0)

CKD-EPI 2021 no longer uses race

Please check your inputs and try again.

Worked Examples

Example 1: Male, 55 years, Cr=1.2 mg/dL

CKD-EPI 2021 equation

Result: eGFR ≈ 65 mL/min — G2, mildly decreased

Monitor annually

Example 2: Female, 70 years, Cr=1.5 mg/dL

CKD-EPI 2021

Result: eGFR ≈ 38 mL/min — G3b

Refer to nephrology

Frequently Asked Questions

When should eGFR be checked?

Annually for diabetics and hypertensives. With nephrotoxic medications (NSAIDs, contrast, aminoglycosides). Whenever creatinine is measured.

What medications need dose adjustment?

Metformin (hold if eGFR<30), NSAIDs (avoid <30), contrast agents (risk if <45), many antibiotics (aminoglycosides, vancomycin). Always check drug labeling.