eGFR Calculator — Kidney Function & CKD Stage (CKD-EPI 2021)

Calculate your estimated Glomerular Filtration Rate (eGFR) from a serum creatinine lab result using the CKD-EPI 2021 equation — the current clinical standard recommended by KDIGO guidelines. EGFR is the primary measure of kidney function and the basis for Chronic Kidney Disease (CKD) staging. A single low result doesn't diagnose CKD — the diagnosis requires readings below 60 mL/min/1.73m² or evidence of kidney damage for at least 3 months. This tool provides educational context for a lab result, not a clinical diagnosis. The CKD-EPI 2021 equation is race-free, replacing the 2009 version that included a race adjustment now considered clinically inappropriate. Results from this calculator reflect current best-practice calculation methodology. This is an educational tool. Always interpret lab results with your healthcare provider who has access to your full medical history, symptoms, trends, and clinical judgment. Understanding your eGFR stage and what it implies for management — blood pressure targets, medication review, follow-up frequency — helps you have a more informed conversation with your nephrologist or primary care doctor.